海水中痕量硅酸盐硅钼黄分析法研究
A STUDY OF MOLYBDOSILICIC ACID METHOD OF SILICATE IN SEA WATER
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摘要: 海水中痕量硅酸盐常用硅钼黄法测定[1-4].本文进一步研究酸度对硅钼黄形成反应的影响,采用合理的高酸度以获得较高的灵敏度和稳定性,使盐效应校正系数降低至4%.试验用人工海水工作曲线,结果免除了盐效应校正手续.试验将反应试剂事先混合后一次加入,简化了分析操作,缩短了工作时间,减少了船上的工作量.监于硅酸盐可能有聚合及水解反应,曾试验本方法制备的硅标准溶液的稳定性,结果可稳定一年之久.Abstract: Here proposed is a modified molybdosilicic acid method for the determination of silicate in sea water.A suitable acidity is used to obtain higher sensitivity and stability.At this acidity,the salt effect coefficient is lowered to about 4%.To eliminate the calibration of salt effect,artificial sea water is applied.In order to simplify the method and to diminish the work on ship,the mixed reagent is introduced.The precision and accuracy of the modified method is satisfactory.The standard solution of silicate prepared by this method is stable within one year.
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