Journal of Soils and Sediments Impact Factor & Information

Publisher: Ecomed, Springer Verlag

Journal description

JSSS is the first journal entirely devoted to soils and sediments, hereby dealing not only with contaminated, but also with intact and disturbed soils and sediments. JSSS elucidates the common aspects as well as the differences between these two environmental compartments. JSSS is an interdisciplinary journal intended to be of benefit to the scientist as well as to the practitioner. Topics: Research on effects caused by disturbances and contamination; Research, strategies and technologies for prediction, prevention, and protection; Research, strategies and technologies for identification and characterisation; Research, strategies and technologies for treatment, remediation and reuse; Strategies for risk assessment and management; Research on and the implementation of quality standards; International regulation and legislation.

Current impact factor: 2.11

Impact Factor Rankings

2015 Impact Factor Available summer 2015
2013 / 2014 Impact Factor 2.107
2012 Impact Factor 1.965
2011 Impact Factor 1.863
2010 Impact Factor 2.574
2009 Impact Factor 2.613
2008 Impact Factor 2.797
2007 Impact Factor 4.373

Impact factor over time

Impact factor
Year

Additional details

5-year impact 2.15
Cited half-life 3.10
Immediacy index 0.37
Eigenfactor 0.00
Article influence 0.57
Website Journal of Soils and Sediments website
Other titles Journal of soils and sediments (Online), JSS
ISSN 1439-0108
OCLC 58997092
Material type Periodical, Internet resource
Document type Internet Resource, Journal / Magazine / Newspaper

Publisher details

Springer Verlag

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    • Must link to publisher version
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    • Articles in some journals can be made Open Access on payment of additional charge
  • Classification
    ​ green

Publications in this journal

  • [Show abstract] [Hide abstract]
    ABSTRACT: Purpose Association of element concentrations for the escarpment soils of northeastern North Dakota formed from different geologic parent materials was determined based on geochemical data. These soils overlie the Cretaceous Pierre Formation, and parent materials consist of shale rich glacial till, residual shale, and colluvial materials. Materials and methods Samples were analyzed for cadmium and other trace elements using nitric acid digestion followed by optical emission spectroscopy. Morphologic and laboratory analysis of soil cores indicate high clay content, indicative of the influence of shale residuum on the parent materials of the escarpment soils. Results and discussion An average, cadmium concentration of 0.24 ± 0.22 mg/kg was determined for 136 samples from eight (approx. 2.4 m deep) cores. The concentration of molybdenum had a range between 0.00 and 7.99 mg/kg. Zinc levels determined in the samples had a wide range between 18.76 and 128.02 mg/kg. Principal component analysis revealed that elevated trace element concentrations for the shale-rich portion of the soils in northeastern North Dakota are linked to a variety of factors including organic matter content, pH, elevation, and electrical conductivity. Conclusions Results of this study suggest that erosion and transport of Cretaceous shales downslope on the escarpment have resulted in enriched trace element concentrations in the soils.
    Journal of Soils and Sediments 07/2015; 15(7). DOI:10.1007/s11368-015-1122-6
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    ABSTRACT: Purpose The goals of this study are to identify the individual fluorophore component in dissolved organic matter (DOM) of saline-alkali soils, to determine the binding capacities and stability constants of Cu (II) with fluorescent DOM components, and to analyze the potential impact on the complexation between Cu (II) and DOM in different soil environment. Materials and methods DOM extracted from five saline-alkali soil samples were studied by fluorescence quenching titrations combined with three-dimensional excitation-emission matrix (3D-EEM) spectra and parallel factor analysis (PARAFAC). Modified Stern-Volmer model was used to calculate the conditional stability constant (K) and the percent of fluorophores (f %) participating in the complexation reaction. Results and discussion Three main fluorescent components in the DOM, e.g., fulvic-like (component 1), humic-like (component 2), and protein-like (component 3) were identified and characterized by fluorescence EEM-PARAFAC. Both the components 1 and 2 showed fluorescence quenching by gradual addition of Cu (II), while component 3 had no marked change in fluorescence intensity. The higher log K of DOM-Cu (II) complexes suggests that the DOM has a high Cu binding affinity. Meanwhile, humic-like components showed higher in the proportion of organic ligands than those of fulvic-like components in the DOM of saline-alkali soils. Conclusions The fluorescence quenching titration using EEM-PARAFAC analysis allows for the assessment of metal ion interactions with specific fluorophores, and is a good approach to study the geochemical behavior of metal ions in saline-alkali soils and to provide a support for the management of saline-alkali soil environment.
    Journal of Soils and Sediments 07/2015; 15(7). DOI:10.1007/s11368-015-1113-7
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    ABSTRACT: Purpose The bonding of copper (Cu) in soil is important for bioavailability of Cu and toxicity towards plants and animals. The hypothesis of the present study is that variations in molecular Cu bonding can explain previously reported variations in soil ecotoxicity along a Cu contamination gradient when parent material and mineralogy are similar. The specific aim is to understand molecular bonding at the different levels of bioavailability, and compare this with results from a sequential extraction. Materials and methods The studied field samples were retrieved from an anthropogenic contaminated site (Hygum, Denmark) dated to the 1920s. This fallow field shows a steep Cu gradient within a confined area where other soil forming factors are constant. Five surface soil samples (0-15 cm) with Cu levels ranging from background (25 mg Cu kg−1) to strongly contaminated levels (3920 mg Cu kg−1) were analyzed by X-ray absorption spectroscopy [Cu K-edge X-ray absorption near edge structure (XANES)], sequential chemical extractions by a three-step BRC method, particle-size and density fraction, microprobe mapping (2 × 2 μm resolution) and bulk soil chemical analysis. Results and discussion Only Cu and the soil organic C contents covaried, and both bulk chemical analyses and microprobe mapping showed strong co-localization of Cu and natural organic matter (NOM). The distribution of Cu between particle-size fractions does not vary significantly, and the clay fraction accounted for 62-75 % of the bulk soil Cu content. The largest Cu fraction (78-81 %) was found in the light density fraction (−3). The acid-extractable and the reducible fractions are well explained by a simple linear regression (R 2 = 0.97 and R 2 = 0.99, respectively). Both the oxidizable fraction and the residual fraction level out at the highest contaminations. The molecular environment indicated by XANES was in all the contaminated samples best described by Cu(II) bound to humic acids only. The natural samples’ XANES revealed that a part of the Cu here was mineral bound as Cu(0)/Cu(I). Conclusions The microprobe, physical fractionations, and XANES results all supported previous reports that Cu contamination is bound to NOM in soils, and we here show that this is independent of the studied contamination levels when all soil properties except NOM content are constant. Current understanding of sequential chemical extraction protocols does not incorporate this consistently, as the large observed shifts in our extractability of Cu fractions were most likely caused by differences in submicrometer molecular Cu-NOM bonding and not differences in Cu-mineral phase interactions.
    Journal of Soils and Sediments 07/2015; 15(7):1558-1570. DOI:10.1007/s11368-015-1109-3
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    ABSTRACT: Purpose Humic acid and mineral oxides are simultaneously present in soils and can form organomineral complexes. These complexes can influence the transport and fate of phosphate in the environment. The objective of this study was to investigate the adsorption of phosphate on these complexes by comparing them with phosphate adsorption on only the mineral. Materials and methods Phosphate adsorption on ferrihydrite (FH) and the humic acid (HA)-coated ferrihydrite (FH-cHA) complex, as a function of pH and ionic strength, was investigated through adsorption measurements of zeta potential and attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy. Results and discussion The FH-cHA complex had a lower isoelectric point and less specific surface area than FH. A greater amount of phosphate was adsorbed on FH than on the FH-cHA complex, and phosphate adsorption increased with increasing ionic strength. The adsorption process was controlled by chemisorption. The zeta potential strongly decreased with an increase of phosphate adsorption at low pH, while it less obviously decreased at higher phosphate adsorption at high pH. The ATR-FTIR showed that the phosphate species on the FH-cHA complex was dominated by bidentate inner-sphere complexes. The addition of HA did not change the formation of the inner-sphere phosphate complexes, but it diminished the non-protonated bidentate complexes at lower pH. Also, the HA inhibited the non-protonated bidentate complexes at lower pH and generated P = O···H or P-O···H bonds by its acid groups. Conclusions Results suggested that the affinity of phosphate for the FH-cHA complex was lower than for FH, and HA also influenced the formation of the phosphate species.
    Journal of Soils and Sediments 07/2015; 15(7). DOI:10.1007/s11368-015-1095-5
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    ABSTRACT: Purpose Variation in soil moisture content can change metal availability. However, the effects of soil drying during wetting-drying cycles on metal availability have been little investigated. Metal availability to an imposed sink can be assessed by the diffusive gradients in thin film (DGT) technique. The purpose of this study was therefore to investigate the effects of the soil drying processes and previous soil moisture contents on metal availability using DGT. Materials and methods Two metal-polluted agricultural soils with contrasting pH (one acid and one calcareous) were collected from agricultural fields and were repeatedly phytoextracted with a Zn/Cd hyperaccumulator. Both soils, with and without phytoextraction, were subjected to two soil drying processes, i.e. drying from flooded conditions to 50 % maximum water holding capacity (WHC) and drying from 100 to 30 % WHC. Changes in metal availability induced by changing soil water moisture were examined using DGT. Results and discussion In acid soils, the availability of cadmium (Cd), zinc (Zn) and nickel (Ni) (but not copper) increased with drying from saturation to 50 % WHC. Drying soil from 100 to 30 % WHC had weak or no significant effects on available metals. Availabilities of Cd, Ni and Zn correlated well with available Al for both drying conditions. In calcareous soil, a decreasing trend of metal availability with soil drying from saturation to 50 % WHC or from 100 to 30 % WHC was found. Soils were also subjected to different wetting-drying cycles prior to drying. In acid soil, available copper (Cu) was correlated with dissolved organic carbon (DOC). Available Cd, Ni and Zn were correlated with available Al and increased with soil wetting-drying cycles in phytoextracted soil, but not in non-remediated soil. In calcareous soil, available Cu and Ni were correlated well with DOC and were higher with long dry periods. However, available Cd and Zn were lower in soils dried from the cycle of saturation to 50 % WHC. Conclusions The results indicate that soil water regimes can be manipulated to alleviate soil metal availability, but they must be tailored to individual metals and different soil types, and soil moisture content before drying should be considered when dried soils are used for evaluation of metal availability.
    Journal of Soils and Sediments 07/2015; 15(7). DOI:10.1007/s11368-015-1090-x
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    ABSTRACT: Purpose The aim of this study was to assess if veterinary antibiotics, which are introduced to agricultural fields via fertilizer, are present in water systems (in both water and sediment) following overland transport via runoff and soil erosion. Materials and methods Three water and sediment sampling schemes were conducted in Germany between June 2013 and June 2014 to examine the effects of (1) season, (2) heavy rainfall and (3) high veterinary antibiotic usage. The samples were analysed for 15 veterinary antibiotics using liquid chromatography tandem mass spectrometry. Results and discussion Antibiotics were detected in all three schemes in trace quantities. This is the first time that veterinary antibiotics have been detected in German sediment. Conclusions In particular, the presence of tetracycline in sediment taken from irrigation ditches in an agricultural area of high veterinary antibiotic usage offers proof that the overland transport of veterinary antibiotics is occurring. Due to the strong sorption of veterinary antibiotics (particularly tetracyclines) to soils, further research into their transport via soil erosion and assessment of their presence in sediment is advised.
    Journal of Soils and Sediments 07/2015; 15(7). DOI:10.1007/s11368-015-1140-4
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    ABSTRACT: Purpose A large-scale managed reed wetland in Yancheng Biosphere Reserve of China has been irrigated by treated papermaking wastewater (TPW) for approximately 8 to 12 years. This report details the risk evaluation of long-term TPW irrigation on the soil and its microbial viability, providing important perspective on the suitability of TPW reuse for irrigation. Materials and methods An extensive field survey was employed for assessing the impacts of long-term TPW irrigation of reed fields (F1 to F6), as compared to river water irrigated field, on soil physicochemical properties, accumulation of heavy metals (Cu, Cd, Pb), soil enzyme activities (i.e., urease, invertase, catalase, and polyphenol oxidase), and soil microbial community metabolic profiles. Results and discussion The results revealed that long-term TPW reuse for irrigation resulted in a slight increase of pH value, while a remarkable increase was identified regarding to soil organic carbon, as expected from the organic carbon content of the wastewater, but was not proportional to the time of irrigation. TPW irrigation caused a remarkable increase in soil electrical conductivity and resulted in soil salinization, having strong correlation with the duration of irrigation. Soil salinization increase in irrigated area was mainly due to the high sodium content of the wastewater applied for irrigation. Furthermore, soil enzymes displayed significantly increased activities (except for catalase) in the irrigated fields, while the microbial ability of utilizing carbon source was enhanced. The diversity of microbial communities was boomed due to the increase of soil organic matter, as evidenced by the calculated diversity indices. However, a remarkable increase of heavy metals was also identified regarding Cd and Pb concentrations, which may pose potential risks to human health. Conclusions The input of excessive pollutants and nutrients will disrupt the equilibrium mechanism of the wetland ecosystem. Although long-term TPW irrigation may increase the soil fertility and microbial activity, heavy metals (i.e., Cd and Pb) in wastewater can be accumulated in the soil. Furthermore, alkaline TPW caused an increase in soil salinity. Therefore, more cautions should be exercised in the reuse of TPW for irrigation.
    Journal of Soils and Sediments 06/2015; DOI:10.1007/s11368-015-1161-z
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    ABSTRACT: Purpose Coal mining activities are inevitably connected with production of acidic drainage and airborne compounds such as fly ash and bottom ash with high metal content. Soil is a prominent sink for trace elements discharged from anthropogenic sources. Thus, understanding the occurrence, accessibility and ecological risk of trace elements around coal mining areas is of utmost importance in view of implications for environmental health. Materials and methods Seventy-five soil samples from 25 different sites were collected from Jharia coal field (India) and analyzed for pH, electrical conductivity, total organic carbon, and trace elements. For the background values of trace elements, black shale and sandstone were collected from the study area and analyzed for trace element concentrations. Sampled soils were evaluated for the level of soil contamination with respect to average shale concentrations of toxic trace elements in the region and assessed for their ecological risk in terms of enrichment factor, contamination factor, and pollution load index. Interactions among different trace elements and their spatial distribution were analyzed by the use of multivariate approaches. The study also quantifies the potential sources of contamination for each element and their relation with emission source. Results and discussion The average concentrations of Pb, Ni, Cu, Mn, Fe, Zn, and Cd in the soil exceeded the world averages, while Cu and Zn overstepped their respective critical limit in the soil. Enrichment factor values showed that soil near coal mine areas was loaded with Pb, Cd, Cu, Zn, and Ni. The pollution load index and contamination factor suggest that the soils were contaminated by all the investigated trace elements and areas near coal mines were the most polluted. The absolute principal component score technique, combined with multiple linear regression analysis revealed three major factors, coal mining activities/mine fires (40 %), windblown dust (23 %), and crustal (24 %), were responsible for soil trace element pollution in the area. Conclusions Coal mining activities, mine fires, and windblown dust are the chief contributors of soil pollution in the area. Coal mining activities/mine fires are the main contributing sources to soil Ni, Cu, and Cr, while crustal input was mainly represented by Mn and Zn and windblown dust for Pb, Fe, and Cd. High concentrations of trace elements at any site depend on the feasibility and availability of respective pollution sources.
    Journal of Soils and Sediments 06/2015; DOI:10.1007/s11368-015-1173-8
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    ABSTRACT: Purpose Nitrate can be produced through autotrophic and heterotrophic nitrification. Soil temperature and moisture are key factors affecting nitrification; however, how they influence the relative importance of autotrophic and heterotrophic nitrification is still unknown. The aim of this study was to determine the effects of soil temperature and moisture on autotrophic and heterotrophic nitrification in an acid cropping soil. Materials and methods An acid cropping soil (pHH2O 4.5) with high organic matter content (6.2 %) was collected from a wheat cropping system and used in a laboratory incubation experiment. Nitrogen as 15NH4Cl and K15NO3 was applied to soil samples which were then incubated for 7 days under 15 °C, 25 °C and 35 °C and 50 % and 70 % water-filled pore space (WFPS). 15N dilution and acetylene (C2H2) inhibition techniques were used to distinguish autotrophic and heterotrophic nitrification. We measured nitrate (NO3−) and ammonium (NH4+) concentration and 15NO3− and 15NH4+ enrichment during the incubation. Results and discussion The result showed that more heterotrophic nitrification was observed under lower temperature (15 °C) conditions. Around 69 % of the NO3− produced was a result of heterotrophic nitrification at 15 °C and 50 % WFPS and 50 % at 15 °C and 70 % WFPS. However, at 25 and 35 °C, nitrification was largely autotrophic regardless of moisture. Conclusions Our results demonstrate that heterotrophic nitrification can be an important N transformation pathway in the studied soil. The contribution of heterotrophic nitrification decreased with increasing temperature and moisture.
    Journal of Soils and Sediments 06/2015; DOI:10.1007/s11368-015-1170-y
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    ABSTRACT: Purpose Conservation tillage can significantly affect the biological, chemical, and physical properties of soil. This study aimed to determine the effect of conservation tillage on the soil microbial community and respiration and on soil CO2 emissions. Materials and methods In this study, the effects of 10 years of conservation tillage (no-till: NT and ridge tillage: RT) on soil CO2 fluxes and soil microbial communities were assessed in a black soil in Northeast China. Results and discussion The annual soil CO2 emissions were higher under moldboard plow (MP) than under NT by 7.8 % (P
    Journal of Soils and Sediments 06/2015; DOI:10.1007/s11368-015-1158-7
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    ABSTRACT: Purpose The risk assessment of metal-contaminated soils demands the establishment of soil screening values (SSVs) for metals. Cadmium(Cd) is a very toxic metal resulting from anthropogenic wastes/activities. However, ecologically relevant Cd SSVs are often unavailable for several European countries, including Portugal, due to the lack of ecotoxicological datasets on regional natural soils. Therefore, this work aims to generate an ecotoxicological dataset in a dominant type of Portuguese natural soil for the preliminary derivation of Cd SSVs. Materials and methods A battery of terrestrial ecotoxicological tests focusing on microbial parameters, reproduction of invertebrates (Eisenia andrei, Enchytraeus crypticus, Folsomia candida), seed germination and growth of terrestrial plants (Avena sativa, Zea mays, Lactuca sativa, Lycopersicon esculentum) was carried out in a natural soil contaminated with Cd. The Assessment Factor approach was followed to determine the predicted no effect concentrations (PNECs) after correcting the toxicity values used for PNEC calculation for leaching-aging processes, as to harmonize toxic effects in freshly spiked soils to those in field soils. The obtained PNECs will be the preliminary derivation of SSVs for Cd. Results and discussion Urease was slightly compromised (EC20 = 47.8 mg Cd kg−1dw), whilst acid phosphatase and cellulase activities, and nitrogen mineralization were the most inhibited parameters (LOEC = 13.4 mg Cd kg−1dw). Invertebrates reproduction was constrained, being E. crypticus the most sensitive species (EC50 = 8.3 mg Cd kg−1dw). The phytotoxicity of Cd was effective on the seed germination of L. sativa and L. esculentum for an EC50 of 460.0 and 919.0 mg Cd kg−1dw, respectively. The dry mass was the most sensitive endpoint for plant growth effects, providing significant inhibitions at a LOEC = 35.0 mg Cd kg−1dw for most species. Based on these data, the PNECs ranged between 3.7 (EC20-based) and 3.5 (NOEC-based) mg Cd kg−1dw. Towards a precautionary decision we proposed an SSV of 3.5 mg Cd kg−1dw. Conclusions When comparing our results with the literature, a direct influence of soil properties on Cd toxicity was likely, hence highlighting the importance of using regional natural soils in the derivation of SSVs. Overall, this work is a good contribution for the establishment of national soil quality guideline values, while at the same time is providing a working path for other European countries.
    Journal of Soils and Sediments 06/2015; DOI:10.1007/s11368-015-1155-x
  • Article: Preface
    Journal of Soils and Sediments 06/2015; 15(6):1275-1277. DOI:10.1007/s11368-015-1079-5
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    ABSTRACT: Purpose Atrazine, as one of most widely applied herbicides in the world, caused significant concern due to long-term threat to the environment and risk for human health. Soil organic matter (SOM) is considered as one of the most important soil component controlling the transport and fate of contaminants in soil/water environments. Therefore, it is important to explore the sorption characteristic as well as distribution of atrazine among different SOM fractions in their respective soils. Materials and methods To further our understanding in this area, various SOM fractions (humic acid1 (HA1), humic acid2 (HA2), humin (HM)) were sequentially extracted using Na4P2O7 and NaOH from two kinds of agricultural soils, and batch sorption experiments for atrazine onto extracted SOM fractions were examined. Results and discussion Atrazine sorption isotherms were nearly linear and were well-fitted to the Freundlich equation with nonlinearity factors (n) ranging from 0.887 to 0.977. The sorption capacity of atrazine by the extracted SOM fractions followed the order HA1 > HA2 > HM, and the organic carbon normalized distribution coefficients (logK OC) were significantly related to (N + O)/C ratios of the extracted SOM fractions, demonstrating that the polarity of SOM fractions dominates atrazine sorption by polar interaction (e.g., H bonding). The relative contributions of different SOM fractions to the overall sorption of atrazine depend on their sorption capacities of atrazine and relative contents in the SOM, and the combined contribution of HA fractions in their respective soils was higher than that of HM although their lower content in SOM. Conclusions The results in this study indicated the important roles of SOM polarity and the HA fractions in the sorption of atrazine by the investigated soils.
    Journal of Soils and Sediments 05/2015; DOI:10.1007/s11368-015-1162-y
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    ABSTRACT: Purpose The development of mathematical models to accurately represent the particle size distribution (PSD) of sediment has been addressed by different authors. Here, we introduce the three-parameter Swrebec function as a tool to fit the PSD of sediments. Moreover, we also assess the physical meaning of the undulation parameter (b) in the function. Materials and methods We performed PSD by means of laser diffraction spectroscopy. Then, sediments were classified and the statistical parameters (mean, skewness, sorting and kurtosis) calculated using GRADISTAT software, according to the Folk and Ward’s method. Subsequently, the Swrebec function (programmed in Matlab) was applied to the data and its goodness-of-fit were evaluated by means of the adjusted coefficient of determination (R 2-Adj) and the root mean squared error (RMSE). The results obtained by Swrebec were also compared with other functions using the Ezyfit toolbox. Results and discussion The Swrebec model provided excellent correlations and low RMSE when fitting all grain size data. Furthermore, a correlation between b and both the skewness and RMSE was established. This indicates that the greater the asymmetry of the function, and therefore the larger the presence of coarse-grained particles, the lower the performance of the function. It was also observed that a change in the behaviour of all trends seems to occur at a b value of ~4.5. Conclusions Results suggest that the studied function could be a simple approach for modelling PSD, with potential applications in soil and sediment science, geochemistry, sedimentology and coastal research modelling.
    Journal of Soils and Sediments 05/2015; DOI:10.1007/s11368-015-1156-9
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    ABSTRACT: Purpose The purposes of the paper are to estimate the inactivating power of soils in relation to radiologically important long-lived radionuclides 65Zn and 60Co and to develop methodological approaches for assessing effects of edaphic factors on the radionuclides mobility in the soil-plant system. Materials and methods For the experimental studies, different soil samples were collected (16 soil types, classes, and subclasses). A model experiment was carried out in a greenhouse where barley plants were grown under controlled conditions for 2 weeks on soils artificially contaminated by 65ZnCl2 and 60CoCl2. The biological availability of stable “natural” Zn, which is an aggregate of stable nuclides, radionuclides 65Zn and 60Co, was determined using the concentration ratio (CR). The physical and chemical parameters of soil (pH, the sum of silt, and clay particles (
    Journal of Soils and Sediments 05/2015; DOI:10.1007/s11368-015-1153-z
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    ABSTRACT: Purpose Dissolved organic matter (DOM) plays an important role in the cycling of elements and the transformation of pollutants in the environment due to its electron-transfer capacity (ETC), but ETC may be affected by environmental factors such as pH and ionic strength. This study was aimed to reveal the effects of pH and ionic strength on the ETC of DOM and the possible mechanisms. Materials and methods DOM was prepared into solutions with various pH values (4, 6, 7, 8, and 10) and ionic strength (0.001, 0.01, 0.1, and 0.5 mol/L KCl). ETC of DOM including electron-accepting capacity (EAC) and electron-donating capacity (EDC) was determined with chronoamperometry. Spectroscopic and chromatographic properties of DOM were evaluated to obtain related structural information to explore the possible mechanisms for the ETC changes. Results and discussion Both the EAC and EDC of DOM increased consistently with increasing pH from 4 to 10. EAC and EDC increased with increasing ionic strength, peaked at 0.1 mol/L KCl, and then decreased. Gel permeation chromatogram displayed different molecular size distribution for the DOM in solution with different pH and ionic strength. Conclusions Environmental pH and ionic strength influence the ETC of DOM by altering the conformation of DOM molecules.
    Journal of Soils and Sediments 05/2015; DOI:10.1007/s11368-015-1154-y