[Flotation and extraction spectrophotometric determination of trace silicate in water].
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.
Di
J
J
Department of Chemistry and Chemical Engineering, Suzhou University, 215006 Suzhou.
Liu
Q
Q
Li
W
W
D001560:Benzidines; D005618:Fresh Water / Q000032:analysis; D008982:Molybdenum / Q000032:analysis; D010084:Oxidation-Reduction; D012680:Sensitivity and Specificity; D017640:Silicates / Q000032:analysis*; D017655:Silicon Compounds / Q000032:analysis; D013053:Spectrophotometry / Q000379:methods; D014874:Water Pollutants, Chemical / Q000032:analysis*
D001560:Benzidines; D017640:Silicates; D017655:Silicon Compounds; D014874:Water Pollutants, Chemical; C013250:silicomolybdate; C021758:3,3',5,5'-tetramethylbenzidine; D008982:Molybdenum