کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10560481 | 969736 | 2011 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Continuous flow method for the simultaneous determination of phosphate/arsenate based on their different kinetic characteristics
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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
This paper proposes a new automated spectrophotometric method for the simultaneous determination of phosphate and arsenate without pre-treatment, which is faster, simpler, less expensive and hazardous than other well-known methods used with water samples. Such method is based on the different kinetic characteristics of complex formation of phosphate and arsenate with ammonium molybdate. A flow system was used in order to achieve good mixing and to provide precise time control. All the measurements were performed at the isosbestic point wavelength (885 nm). Chemical variables were optimized by factorial design (ammonium molybdate 0.015 mol Lâ1, potassium antimony tartrate 1 Ã 10â4 mol Lâ1, and sulphuric acid 0.7 mol Lâ1). An appropriate linear range for both analytes (0.50-8.00 μmol Lâ1), good inter-day reproducibility (4.9% [P] and 3.3% [P + As]) and a sample throughput of 6 hâ1 were obtained. The detection limits are 0.4 μmol Lâ1 P and 0.19 μmol Lâ1 [P + As] (3.3 Sy/x). The method was validated.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Talanta - Volume 85, Issue 3, 15 September 2011, Pages 1310-1316
Journal: Talanta - Volume 85, Issue 3, 15 September 2011, Pages 1310-1316
نویسندگان
Laura Borgnino, Valeria Pfaffen, Pedro J. Depetris, Miriam Palomeque,