期刊
ANALYTICAL LETTERS
卷 42, 期 11, 页码 1662-1677出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/00032710902993829
关键词
Ammonium pyrrolidine dithiocarbamate; cloud point extraction; double-slotted tube atom trap-flame atomic absorption spectrometry; soil; speciation of chromium
To measure the different activity of chromium(VI) and chromium(III) in soil samples, chromium(VI) and total chromium (CrVI+CrIII) was extracted by KCl extracting agent and alkali fusion, respectively. Cloud point extraction (CPE) for speciation determination of chromium with double-slotted quartz tube atom trap-flame atomic absorption spectrometry (STAT-FAAS) was developed. Preconcentration of chromium(VI) and total chromium in different pH solutions was achieved by CPE, with ammonium pyrrolidine dithiocarbamate (APDC) as the chelating agent and Triton X-114 as the cloud point extractant. The conditions of CPE and determination were studied. Under the optimal conditions, the enrichment factor was 50 for chromium from the initial 100-mL sample solution to the final 2-mL determined solution. Compared to the FAAS method, the sensitivity was improved seven-fold for chromium by the STAT-FAAS method. The limit of detection was 0.082 mu g/L for chromium.
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