کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1246814 969773 2009 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Sodium polyacrylate as a binding agent in diffusive gradients in thin-films technique for the measurement of Cu2+ and Cd2+ in waters
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
Sodium polyacrylate as a binding agent in diffusive gradients in thin-films technique for the measurement of Cu2+ and Cd2+ in waters
چکیده انگلیسی

An aqueous solution containing sodium polyacrylate (PA, 0.0030 M) was used in diffusive gradients in thin-films technique (DGT) to measure DGT-labile Cu2+ and Cd2+ concentrations. The DGT devices (PA DGT) were validated in four types of solutions, including synthetic river waters containing metal ions with or without complexing EDTA, natural river water (Hun River, Shenyang, China) spiked with Cu2+ and Cd2+, and an industrial wastewater (Shenyang, China). Results showed that only free metal ions were measured by PA DGT, recovery = 98.79% for Cu2+ and recovery = 97.80% for Cd2+ in solutions containing only free metal ions, recovery = 51.02% for Cu2+ and recovery = 51.92% for Cd2+ in solution with metal/EDTA molar ratio of 2:1 and recovery = 0 in solutions with metal/EDTA molar ratio of 1:1 and 1:2. These indicated that the complexes of Cu–EDTA and Cd–EDTA were DGT-inert or not DGT-labile. The DGT performance in spiked river water (recovery = 8.47% for Cu2+ and recovery = 27.48% for Cd2+) and in industrial wastewater (recovery = 14.16% for Cd2+) were also investigated. Conditional stability constants (log K) of PA–Cu and PA–Cd complexes were determined as 6.98 and 5.61, respectively, indicating strong interaction between PA and the metals.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Talanta - Volume 79, Issue 5, 15 October 2009, Pages 1228–1232
نویسندگان
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