对磺酸基苯基亚甲基若丹宁光度法测定环境水样中的汞

Study on Spectrophotometric Determination of Mercury in Water with p-Sulfobenzylidene-Rhodanine

研究了对磺酸基苯基亚甲基若丹宁 (SBDR)与汞的显色反应 ,在 p H为 4 .0的 HAc- Na Ac缓冲介质中 ,SBDR与汞反应生成 2∶ 1稳定络合物 ,λmax=5 10 nm,ε=8.16× 10 4 L· mol-1· cm-1。汞含量在 0—30 μg/ 2 5 m L范围内符合比耳定律 ,方法用于环境水样中汞含量的测定 。

The color reaction of mercury with p \|sulfobenzylidene\|rhodanine(SBDR) was studied.In the presence of pH=4.0 HAc\|NaAc solution,SBDR can react with mercury (Ⅱ) to form a stable 2∶1 complex.The molar absorptivity is 8.16×10 4L·mol -1 ·cm -1 at 510nm.Beer's law is obeyed in the range of 0_30μg/25mL.This method was applied to the determination of mercury in water with satisfactory results.