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
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
Continuous flow method for the simultaneous determination of phosphate/arsenate based on their different kinetic characteristics
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 L−1, potassium antimony tartrate 1 × 10−4 mol L−1, and sulphuric acid 0.7 mol L−1). An appropriate linear range for both analytes (0.50-8.00 μmol L−1), good inter-day reproducibility (4.9% [P] and 3.3% [P + As]) and a sample throughput of 6 h−1 were obtained. The detection limits are 0.4 μmol L−1 P and 0.19 μmol L−1 [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
نویسندگان
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