中文摘要：

采用钼蓝比色法测定水中As（Ⅲ）和As（V）的含量，实验优化了测定As（Ⅲ）和As（V）的条件。结果表明，显色温度在24～28℃范围，配合物在40min后吸光度达到最大；显色温度高于30℃时，还原剂不稳定导致配合物吸光度一直增大；增大抗坏血酸的量可以消除过量的氧化剂对配合物显色的影响，过量的还原剂对配合物显色无影响；砷的检测在5～100μg／L范围线性良好，线性相关系数为0．9989；检出限为5μg／L；相对标准偏差为2．1％～5．9％。采用该方法测定实际水样中无机砷的含量，砷的加标回收率在98．2％～104．5％之间。

英文摘要：

The concentrations of arsenite and arsenate in drinking water were detected through the molybdenum blue method. The detection conditions of arsenite and arsenate level in water sample were optimized. The results showed that the maximum absorbance of the complexes were at 880 nm after 40 minutes in the color temperature range from 24 to 28 ℃. When the color temperature was above 30 ℃, the reducing reagents became instable and the absorbance of complexes kept on increasing. Increasing the amount of ascorbic acid in the color reagent would compensate the complexes color suppression caused by the superabundant oxidizing reagent. Whereas the reducing reagent had no effect on the complexes color formation. The arsenic concentrations displayed a linear relationship in the range of 5-100 μg/L, with a linear correlation coefficient of 0. 9989. The detection limit of arsenic was 5 μg/L, and the relative standard deviations were from 2. 1% to 5.9%. The inorganic arsenic concentrations in water samples were detected by this method with the recoveries of arsenic for the spiked samples ranging from 98.2%- 104.5 %.