M Díaz-de Alba

Publications (2)7.94 Total impact

• Article: Solid phase extraction of copper traces using poly(styrene-divinylbenzene) membrane disks modified with pyridoxal salicyloylhydrazone in water samples.

  M Díaz-de Alba, M D Galindo-Riaño, M García-Vargas
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  ABSTRACT: A simple technique for the isolation, concentration and matrix simplification of Cu(II) ion in natural waters is proposed. This method has been developed using poly(styrene-divinylbenzene) membrane disks modified with the synthesized ligand pyridoxal salicyloylhydrazone (PSH). The retained ions on the disks were eluted with 10mL 1molL(-1) HNO(3) and measured by flame atomic absorption spectrometry at 324.8nm. The influence of pH, amount of ligand, type and amount of eluent for the stripping of copper ion from the membrane over extraction efficiency were evaluated. Extraction efficiencies >99% were obtained by elution of the disks with minimal amount of solvent with a preconcentration factor up to 100. The precision of the method for 10 replicate measurements of aqueous solutions containing 40μgL(-1) Cu(II) was 1.5% at significance level of 95%. The breakthrough volume for 5μg of Cu(II) was found to be 1000mL and the detection limit of the method was 4ngL(-1) of metal ion. The present method was successfully applied to the extraction and determination of copper in lake and sea waters.
  Talanta 10/2012; 100C:432-438. · 3.79 Impact Factor
• Article: Assessment of the metal pollution, potential toxicity and speciation of sediment from Algeciras Bay (South of Spain) using chemometric tools.

  M Díaz-de Alba, M D Galindo-Riaño, M J Casanueva-Marenco, M García-Vargas, C M Kosore
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  ABSTRACT: A study to determine total and mobile heavy metals concentrations in sediments from Algeciras Bay was performed and pollution hotspots were identified. The effects on aquatic organisms were established using sediment quality guidelines (SQGs). Ni and Cr exceeded the effect range medium and low levels, respectively, around industrial area. Potential toxicity of metals was determined by diethylenetriaminepenta-acetic acid (DTPA) extractions and low alert levels of Co, Cu, Zn, Cd, Ni and Pb were exceeded at most sampling sites. Three pollution indicators were used showing significant values for As, Ni, Cr, Pb and Cd. Sediment speciation using the sequential extraction BCR procedure was carried out, being Cd, Zn, Pb and As the most available metals. Principal component, cluster and ANOVA analyses were performed in order to assess the sources of metals and the influence of seasonality and anthropogenic activities on the sediment quality. Two principal component analysis (PCA) factors were obtained identifying the sampling sites affected by anthropogenic activities; Ni-Cr and Zn-Cu-V clusters were also obtained associated with stainless steel and petrochemical industrial activities. ANOVA showed the outstanding sites because of total metal concentration and significant differences among sampling sites by the acid extractable and reducible fractions for all metals except for Ba and V.
  Journal of hazardous materials 03/2011; 190(1-3):177-87. · 4.14 Impact Factor