کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9743886 | 1491201 | 2005 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Speciation of bio-available chromium in soils by solid-phase extraction and graphite furnace atomic absorption spectrometry
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
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چکیده انگلیسی
Speciation of bio-available chromium in soils was performed using extraction with 0.05 M EDTA followed by strong anionic solid-phase extraction. The step gradient elution technique with 0.1 and 0.5 M NaCl as eluent in sequence was sufficient to separate Cr(III) and Cr(VI) with recoveries of 99.7 and 93.4%, respectively. During the determination of separated chromium species by graphite furnace atomic absorption spectrometry (GFAAS), 10% ammonium nitrate solution was co-injected with the sample to eliminate the interferences from the eluent matrix containing high concentrations of chloride. Linear calibration curves over the range of 0-15 ng mLâ1 were obtained with good correlation coefficients (R2 = 0.9976 for Cr(III)EDTAâ, and 0.9897 for Cr(VI)). The sum of the chromium species determined after separation was in good agreement with total chromium from EDTA extraction of NIST soil standard SRM2709 (0.688 μg gâ1 Cr(III), 0.127 μg gâ1 Cr(VI), 0.742 μg gâ1 total Cr) and a local soil sample (0.030 μg gâ1 Cr(III), 0 μg gâ1 Cr(VI), 0.053 μg gâ1 total Cr).
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Analytica Chimica Acta - Volume 535, Issues 1â2, 11 April 2005, Pages 237-242
Journal: Analytica Chimica Acta - Volume 535, Issues 1â2, 11 April 2005, Pages 237-242
نویسندگان
Guoxin Hu, Richard L. Deming,