Davidson, C M and Ferreira, P C S and Ure, A M (1999) Some sources of variability in application of the three-stage sequential extraction procedure recommended by BCR to industrially-contaminated soil. Fresenius' Journal of Analytical Chemistry, 363 (5-6). pp. 446-451. ISSN 0937-0633Full text not available in this repository. (Request a copy from the Strathclyde author)
Copper, lead, manganese and zinc have been determined in extracts of industrially-contaminated soil to investigate possible sources of variability in the three-stage sequential extraction procedure recommended by BCR. Analysis was performed by name or electrothermal atomic absorption spectrometry, using reagent matched, multi-element standard solutions. Interferences were assessed by use of a single-point standard addition. Although the distribution of contaminants in the soil was expected to be heterogeneous, little difference in precision was found when replicate samples ranging in mass from 1-5 g were extracted, provided the extractant:soil ratio was kept constant. Significant differences in operational speciation were, however, obtained when the procedure was carried out independently by three different analysts. This may be due to the critical effect of pH in Step 2. Reproducibility was higher for air-dried than for field-moist soils, but larger amount of metals were extracted, suggesting alterations in speciation occurred during drying.
|Keywords:||industrially-contaminated soil , electrothermal atomic absorption spectrometry, three-stage sequential extraction procedure , Chemistry, Biochemistry|
|Subjects:||Science > Chemistry|
|Department:||Faculty of Science > Pure and Applied Chemistry|
|Depositing user:||Pure Administrator|
|Date Deposited:||31 May 2012 13:38|
|Last modified:||02 Sep 2016 02:55|