Qi-guo Zhao

Northeast Institute of Geography and Agroecology, Beijing, Beijing Shi, China

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Publications (5)0 Total impact

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    ABSTRACT: The statistical characteristics of plant uptake factor (PUF) of As, Cd and Pb for rice/wheat cereal were analyzed and summarized based on collected data in China. The data were selected and distinguished between field investigation and glasshouse experiment in which metal salts were added to clean soils as grown media. Results showed that the PUF median and range of As, Cd and Pb for rice cereal were 0.026 (0.004-0.090), 0.150 (0.014-1.470), 0.005 (0.001-0.031) and 0.010 (0.003-0.033), 0.360 (0.056-1.700), 0.002 (0.001-0.019) for field investigation and salt added experiment respectively. The PUF median and range of As, Cd and Pb for wheat cereal were 0.010 (0.001-0.110), 0.190 (0.030-2.110), 0.017 (0.001-0.075) and 0.010 (0.003-0.028), 0.150 (0.055-0.730), 0.001 (0.001-0.014) for field investigation and salt added experiment respectively. Significant PUF distribution differences were found between field investigation and salt added experiment. PUF provided not exactly predictive ability of metal uptake by crops since the PUF values were influenced by a variety of factors including the soil contamination levels, basic soils characteristics, the cultivation of the crops and other environmental conditions. However, the ln (PUF) followed Gaussian distribution (R2 = 0.38-0.94) which is useful for general risk assessment and soil benchmark derivation of contaminated croplands. Use of these statistical models is restricted to the range of data they have been derived, as extrapolation outside this range is often unreliable. Soil properties and surrounding environment of the crops should also be in accordance with the conditions PUF derived.
    Huan jing ke xue= Huanjing kexue / [bian ji, Zhongguo ke xue yuan huan jing ke xue wei yuan hui "Huan jing ke xue" bian ji wei yuan hui.] 02/2010; 31(2):488-95.
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    ABSTRACT: Lead benchmarks for soil are mainly established based on blood lead concentration of children. This is because lead plays a dramatically negative role in children's cognitive development and intellectual performance and thus soil lead has been concerned as main lead exposure source for children. Based on the extensively collection of domestic available data, lead levels in air, drinking water are 0.12-1.0 microg x m(-3) and 2-10 microg x L(-1); ingestion of lead from food by children of 0-6 years old is 10-25 microg x d(-1); geometric mean of women blood lead 1concentration of child bearing age is 4.79 microg x dL(-1), with 1.48 GSD. Lead benchmarks for soil were calculated with the Integration Exposure Uptake Biokinetic Model (IEUBK) and the Adult Lead Model (ALM). The results showed the lead criteria values for residual land and commercial/industrial land was 282 mg x kg(-1) and 627 mg x kg(-1) respectively, which was slightly lower compared with U.S.A. and U.K. Parameters sensitivity analysis indicated that lead exposure scenario of children in China was significantly different from children in developed countries and children lead exposure level in China was obviously higher. Urgent work is required for the relationship studies between lead exposure scenario and blood lead level of children and establishment of risk assessment guideline of lead contaminated soil based on human blood lead level.
    Huan jing ke xue= Huanjing kexue / [bian ji, Zhongguo ke xue yuan huan jing ke xue wei yuan hui "Huan jing ke xue" bian ji wei yuan hui.] 10/2009; 30(10):3036-42.
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    ABSTRACT: In order to study whether disposing electronic wastes and secondary metal smelting could cause an arsenic pollution in the environment or not, Luqiao town, Taizhou City, Zhejiang Province was selected as a study area. The main purpose of this paper was to characterize arsenic contents in the local environment, including waters, sediments, soils and rice, and to assess the potential risk to humans. Additionally, the arsenic spatial distribution property and arsenic uptake-translocation rule in soil-rice system were also studied. The results showed that the average arsenic levels in the surface water and the groundwater were 8.26 microg/L and 18.52 microg/L, respectively, which did not exceed the limiting value of Chinese Environment Standards class III . Whereas,some groundwater exceeded the recommended standard by the WHO for drinking water (10 microg/L). The arsenic (on average 7.11 mg/kg) in paddy soils and arsenic (on average 6.17 mg/kg) in the vegetable garden soils were lower than the value recommended by the National Standard (level I). The average arsenic contents in brown rice and husks were 165.1 microg/kg and 144.2 microg/kg, which was also lower than the Chinese Foods Quality Standard. The arsenic contents between the corresponding soils-rice and husks-brown rice showed significantly positive correlations. By comparison, the arsenic contents of soils and husks collected around electroplating were relatively higher than most of other pollutant sources, indicating the electroplating may lead accumulation of arsenic in the paddy soil-rice system.
    Huan jing ke xue= Huanjing kexue / [bian ji, Zhongguo ke xue yuan huan jing ke xue wei yuan hui "Huan jing ke xue" bian ji wei yuan hui.] 07/2008; 29(6):1713-8.
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    ABSTRACT: To assess the impact of secondary smelting activities to the local resident's well beings, the contents of six elements-Cu, Zn, Pb, Cd, As, Se-in human scalp hairs of residents in suburb Fuyang, Zhejiang Province, were determined by atomic absorption spectrometer (AAS) and by atomic fluorescence spectrometer (AFS-930), respectively. The results showed that hair elemental contents were markedly higher than those in unpolluted area. The highest hair contents of Cu, Zn, Pb and Cd reached 312, 513, 700 and 7.41 microg x g(-1), respectively, As and Se 10.08 and 0.85 microg x g(-1), respectively. Additionally, a significant relationship between Cu, Zn, Pb, Cd and As in human hair was observed, which indicated at a certain degree that the elemental pollution was caused by similar source-small blast furnace smelting. Moreover, it showed that the Cu, Zn, Pb, Cd, and As contents in hair of human who were above 40 years old was twice more than those whose age below 40. There was no apparent difference in average content of Cu, Zn, Cd, Se between male and female, except that Pb and As of male hair was higher than female, however, by statistic analysis showing no significant age and gender dependence.
    Huan jing ke xue= Huanjing kexue / [bian ji, Zhongguo ke xue yuan huan jing ke xue wei yuan hui "Huan jing ke xue" bian ji wei yuan hui.] 06/2008; 29(5):1376-9.
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    Xian-Zhang Pan, Qi-Guo Zhao
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    ABSTRACT: This study used GIS technology, remote sensing images of 1949, 1966, 1981, 1984, 1988, 1992, 1996 and 2000, to analyze the spatial process of urbanization and its impact on the soil resources in Yixing city, southeast China. The results showed that the urban area grew more than three-fold during 51 years and the loss of paddy soil accounted for 82.9% of all soil loss. According to the expansion dynamics and the results of spatial metrics, the urban expansion process in Yixing could be divided into four steps, the initial step (1949–1966), the almost standstill step (1966–1981), the preparation step (1981–1984) and the rapid growing step (after 1984). The study also indicated that the urban expansion was encouraged by the transportation system, however, restricted by the rivers, lakes and hills. The local government's decision also affected the spatial process of urban expansion. The spatial process of Yixing urban expansion might reflect the spatial process of urbanization of southeast China, the region with a rapidly growing economy.
    CATENA. 01/2007;