Indirect near-infrared spectrophotometric determination of silicate by the 2-amino-4-chlorobenzenethiol method.
An indirect near-infrared spectrophotometric method for the determination of silicate, based on the absorbance of an equivalent amount of molybdenum-2-amino-4-chlorobenzenethiol complex in chloroform solution, has been developed. The green chloroform solution has an absorbance maximum at 715 nm. The development of the spectrophotometric method for the determination of silicate included a study of a buffer system for the purpose of maintaining the pH within a narrow optimum pH range, complex stability, effect of diverse ions, and conformity to Beer's law. The limit of detection is 0.034 mug of silicon per ml of aqueous heteropoly acid solution.
Trudell
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Department of Chemistry, Wayne State University, Detroit, Michigan 48202, U.S.A.
Boltz
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