کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10529327 | 960797 | 2005 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Determination of trace amount of bismuth(III) by adsorptive anodic stripping voltammetry at carbon paste electrode
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
A sensitive method is described for the determination of trace bismuth based on the bismuth-bromopyrogallol red (BPR) adsorption at a carbon paste electrode (CPE). The overall analysis involved a three-step procedure: accumulation, reduction, and anodic stripping. Optimal conditions were found to be an electrode containing 25% paraffin oil and 75% high purity graphite powder, a 0.30 mol lâ1 HCl solution containing 2.0Ã10â5 mol lâ1 BPR as supporting medium; accumulation potential and time, â0.10 V, 3 min; reduction potential and time, â0.35 V, 60 s; scan rate 100 mV sâ1; scan range from â0.35 to 0.15 V. It was found that the Bi(III)-BPR complex could be accumulated on the electrode surface during the accumulation period. Then the Bi(III) in the Bi(III)-BPR complex on the CPE surface was reduced to Bi(0) during reduction interval and finally reoxidized during the anodic stripping step for voltammetric quantification. Factors affecting the accumulation, reduction, and stripping steps were investigated. Interferences by other ions were studied as well. The detection limit was found to be 5Ã10â10 mol lâ1 with a 3 min accumulation time. The linear range was from 1.0Ã10â9 to 5.0Ã10â7 mol lâ1. Application of the procedure to the determination of bismuth in water and human hair samples gave good results.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Analytica Chimica Acta - Volume 534, Issue 1, 4 April 2005, Pages 143-147
Journal: Analytica Chimica Acta - Volume 534, Issue 1, 4 April 2005, Pages 143-147
نویسندگان
Huishi Guo, Yiheng Li, Pengfeng Xiao, Nongyue He,