SPECTROPHOTOMETRIC DETERMINATION OF SILICON IN KAOLINS BY FLOW INJECTION ANALYSIS

ANUCHIT PROWNPUNTU AND UMAPORN TITAPIWATANAKUN.

ABSTRACT: A flow injection analysis procedure is described by which dissolved silicon can be determined in complex aqueous media such as soil extracts. The spectrophotometric determination is based on yellow silicomolybdate. A soil sample solution is prepared by fusion with sodium hydroxide and subsequent dissolution of the cake in 6 M hydrochloric acid. The flow system permits high throughput of 120 samples h^-1 without any carryover. The procedure has been applied to kaolins from various parts of Thailand and gave satisfactory agreement with the recommended method.

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Department of Chemistry, Chulalongkorn University, Bangkok 10330, Thailand.

Received 17 April 1991