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A. V. Medvetsky, T. I. Tichomirova, N. M. Sorokina, G. I. Tsysin
Preconcentration of phosphate and silicate ions on
cellulose filters as hydrophobic ion associates of heteropoly acids with
tri-n-octylamine
Abstract
A
technique for preconcentration of phosphate and silicate-ions in the form of
ionic associates of molybdoheteropoly acids (MHA) with tri-n-octylamine (TOA)
from water solutions on the cellulose filters treated with paraffin has been
proposed. The influence of sulfuric acid concentration, molybdenum(VI) and TOA
on the MHA recovery was studied. Silicon and phosphorus were determined
directly on the filters by X-ray fluorescence method. Calibration dependencies
were linear in concentration ranges: 0,5 – 30 µg of phosphorus and 1 – 45 µg of
silicon on filter.
Copyright (C) Chemistry Dept., Moscow State University, 2002
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