کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1170337 960676 2007 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Determination of humic substances in natural waters by cathodic stripping voltammetry of their complexes with iron
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
Determination of humic substances in natural waters by cathodic stripping voltammetry of their complexes with iron
چکیده انگلیسی

A new voltammetric method is presented for the measurement of humic substances (HS) in natural waters. The method is based on catalytic cathodic stripping voltammetry (CSV) and makes use of adsorptive properties of iron–HS complexes on the mercury drop electrode at natural pH. A fulvic acid standard (IHSS) was used to confirm the voltammetric response (peak potential and sensitivity) for the HS for natural water samples. Optimized conditions included the linear-sweep mode, deposition at −0.1 V, pH buffered at 8 and a scan rate of 50 mV s−1. At a deposition time of 240 s in the presence of 10 nM iron and 30 mM bromate, the detection limit was 5 μg L−1 HS in seawater, which could be lowered further by an increase in the bromate concentration, or in the adsorption time. The method was used to determine HS in the Irish Sea which were found to occur at levels between 60 and 600 μg L−1. The new method is sufficiently sensitive to detect the low HS content in oceanic samples and has implications to the study of iron speciation.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Analytica Chimica Acta - Volume 599, Issue 1, 5 September 2007, Pages 58–66
نویسندگان
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