Spectrophotometric determination of silicate in rain and aerosols by flow analysis

A flow analysis (FA) procedure for the measurement of soluble silicon with respect to the total Si concentration is described. After solubilization in H 2O, in alkaline solutions or in concentrated HF, silicon is determined by the molybdenum blue spectrophotometric method. The effects of Si complexa...

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Bibliographic Details
Published in:Analytica chimica acta 1999-09, Vol.396 (2), p.285-292
Main Authors: Giacomelli, M.C., Largiuni, O., Piccardi, G.
Format: Article
Language:English
Subjects:
Airborne particles
Analytical chemistry
Applied sciences
Chemistry
Exact sciences and technology
Flow system
Natural water pollution
Pollution
Rain
Rainwaters, run off water and others
Silicon
Spectrometric and optical methods
Spectrophotometry
Water treatment and pollution
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Summary:A flow analysis (FA) procedure for the measurement of soluble silicon with respect to the total Si concentration is described. After solubilization in H 2O, in alkaline solutions or in concentrated HF, silicon is determined by the molybdenum blue spectrophotometric method. The effects of Si complexation by F − are considered as are the decomplexing capacities of H 3BO 3 or Al 3+. The proposed method is applied to samples of rain and of aerosols on filters, collected in Florence. For both kind of samples, the water soluble silicon content is about 1% and practically independent of the total silicon content.
ISSN:0003-2670
1873-4324
DOI:10.1016/S0003-2670(99)00421-3