草酸-砷钼蓝分光光度法测定砷

Spectrophotometric Determination of Trace Arsenic with Oxalic Acid-As-Mo Heteropoly Blue

砷钼蓝分光光度法测定微量砷 ,很容易生成钼蓝 ,严重干扰砷的测定 ,在合适的反应条件下 ,加入适量草酸溶液作掩蔽剂 ,控制溶液中钼酸铵的浓度 ,有效地防止钼酸铵的还原。本法测试条件温和 ,抗干扰能力很强 ,显色体系稳定 ,操作简便 ,应用于矿物、冶金废渣等复杂试样中微量砷的测定 ,结果令人满意。

The trace arsenic was determined spectrophotometrically with H 2C 2O 4-As-Mo heteropoly blue,in which the addition of H 2C 2O 4 eliminates the interference of molybdic blue.The method is stable for the color reaction,easy to operate under the mild conditions,and was used to determine trace arsenic in samples such as mineral and waste metallurgic residue with satisfactory results.