摘要：

介绍了一种测定工业循环冷却水中钼酸盐含量的方法———硫氰酸盐分光光度法。在待测水样中加入6.0 mL硫酸溶液,1.0 mL硫酸亚铁铵溶液,10.0 mL硫氰酸铵溶液以及1.0 mL抗坏血酸溶液,此时钼酸盐被还原成Mo⁵⁺,并与硫氰酸盐形成橙色络合物,在460 nm波长处测定该络合物的吸光度并通过标准曲线计算出钼酸盐含量。该方法科学、稳定,抗干扰能力强,测定范围适用于循环冷却水中钼酸盐含量的测定。

关键词: 工业循环冷却水, 钼酸盐, 硫氰酸盐分光光度法

Abstract:

A method for determinating the molybdate content in industrial circulating cooling water,i.e.thiocyanate spectrometry,is introduced.The molybdate is reduced to Mo⁵⁺ by adding 6.0 mL of sulfuric acid solution,1.0 mL of ferrous ammonium sulphate solution,10.0 mL of ammonium thiocyanate solution and 1.0 mL ascorbic acid solution,and forms orange complex with thiocyanate.The absorbency of the complex is determined at 460 nm and the molybdate content is figured out by the calibration curve.This method is scientific and stable,and having strong capacity of anti-jamming.Its determination range is suitable for circulating cooling water.

Key words: industrial circulating cooling water, molybdate, thiocyanate spectrometry

中图分类号: 

• TQ085+.4