کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1171192 960709 2007 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Application of permeation liquid membrane and scanned stripping chronopotentiometry to metal speciation analysis of colloidal complexes
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
Application of permeation liquid membrane and scanned stripping chronopotentiometry to metal speciation analysis of colloidal complexes
چکیده انگلیسی

The potential of permeation liquid membrane (PLM) to obtain dynamic metal speciation information for colloidal complexes is evaluated by measurements of lead(II) and copper(II) complexation by carboxyl modified latex nanospheres of different radii (15, 35, 40 and 65 nm). The results are compared with those obtained by a well characterized technique: stripping chronopotentiometry at scanned deposition potential (SSCP). Under the PLM conditions employed, and for large particles or macromolecular ligands, membrane diffusion is the rate-limiting step. That is, the flux is proportional to the free metal ion concentration with only a small contribution from labile complexes. In the absence of ligand aggregation in the PLM channels, good agreement was obtained between the stability constants determined by PLM and SSCP for both metals.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Analytica Chimica Acta - Volume 589, Issue 2, 25 April 2007, Pages 261–268
نویسندگان
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