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Spectrophotometric Determination of Silicon in Environmental Water Sample with Silicomolybdate Blue

YU Hui,ZHAI Qing-zhou,YANG Hui (Research Center for Nanotechnology,Changchun University of Science and Technology,Changchun 130022,Jilin,China)  
Silicon(IV) reacts with ammonium molybdate to form silicomolybdate yellow at hydrochloric acid concentration of 0.050 mol·L-1.Silicomolybdate yellow is reduced by ascorbic acid and forms silicomolybdate blue at hydrochloric acid concentration of 1.48 mol·L-1.The maximum absorption of the complex exhibits at 346 nm and the molar absorptivity is ε346 nm=4.5×104 L·mol-1·cm-1.Beer's law is obeyed over the range of 0.1~2.8 μg·mL-1 of silicon(IV).The effect of thirty-six common co-existing substances on the determined results of silicon(IV) was observed.The method was successfully used in the determination of silicon in environmental water sample with satisfactory results.
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