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  • Title: [Flotation and extraction spectrophotometric determination of trace silicate in water].
    Author: Di J, Liu Q, Li W.
    Journal: Guang Pu Xue Yu Guang Pu Fen Xi; 2000 Dec; 20(6):863-5. PubMed ID: 12938497.
    Abstract:
    In HCl solution, silicate reacted with molybdate ammonium to produce silicomolibdic, then a yellow compound which was produced from the oxidation of TMB was simultaneously isolated to benzene phase by flotation and then isolated to dimethylsulfoxideformic acid by extraction. The compound gives a high absorption at 458 nm. The apparent molar absorptivity is 1.26 x 10(5) L.mol-1.cm-1. In the range of 0.02-1 mg.L-1 Si obeys Beer's law. The proposed method which combines with enrichment and measurement is simple, rapid, selective and convenient to determine silicate in water with satisfied results.
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