[浮选萃取分光光度法测定水中痕量硅酸盐]
[Flotation and extraction spectrophotometric determination of trace silicate in water].
作者信息
Di J, Liu Q, Li W
机构信息
Department of Chemistry and Chemical Engineering, Suzhou University, 215006 Suzhou.
出版信息
Guang Pu Xue Yu Guang Pu Fen Xi. 2000 Dec;20(6):863-5.
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.
在盐酸溶液中，硅酸盐与钼酸铵反应生成硅钼酸，然后通过浮选将TMB氧化生成的黄色化合物同时分离至苯相，再通过萃取分离至二甲亚砜 - 甲酸中。该化合物在458nm处有高吸收。表观摩尔吸光系数为1.26×10⁵L·mol⁻¹·cm⁻¹。在0.02 - 1mg·L⁻¹的硅范围内符合比尔定律。所提出的富集与测定相结合的方法简单、快速、选择性好，用于测定水中硅酸盐方便且结果满意。
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