کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9748473 | 1493781 | 2005 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Sulfur speciation by capillary zone electrophoresis
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
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چکیده انگلیسی
In this paper, a capillary zone electrophoretic (CZE) method was developed for the separation of the sulfur species dithionite (S2O42â), sulfite (SO32â), sulfate (SO42â) and thiosulfate (S2O32â). A carrier electrolyte (pH 7.0) containing 1.5 mmol Lâ1 pyromellitic (PM) acid, 10 mmol Lâ1 Tris(hydroxymethyl)-aminomethane (Tris), 0.5 mmol Lâ1 diethylenetriamine (DETA) and 0.1% (v/v) formaldehyde (as stabilizer for S2O42â and SO32â) allowed the determination of the sulfur anions after 9 min CZE separation with indirect UV detection at 214 nm. The addition of 0.1% (v/v) formaldehyde to the sample solution stabilizes dithionite and sulfite as HOCH2SO2â and HOCH2SO3â anions. The procedure was applied for the determination of dithionite and its decomposition products sulfite, sulfate and thiosulfate in commercial formulations of bleaching agents. Dithionite was found to be the major component of the commercial formulations in concentrations between 30.80 and 33.30% (w/w). As anticipated, sulfite, sulfate and thiosulfate were found to be present as decomposition or by-products in the commercial formulations at concentrations of 14.30-14.80, 5.20-5.70 and 0.30-0.40% (w/w), respectively. The results were found to be in good agreement with those of polarographic and spectrophotometric determinations.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Chromatography A - Volume 1099, Issues 1â2, 16 December 2005, Pages 185-190
Journal: Journal of Chromatography A - Volume 1099, Issues 1â2, 16 December 2005, Pages 185-190
نویسندگان
Leandro M. de Carvalho, Georg Schwedt,