【摘要】 以硼砂-氢氧化钠作为缓冲溶液,在溴化十六烷基三甲胺(CTMAB)及OP乳化剂存在下,Hg2+与过量二苯碳酰二肼(DPC)反应生成稳定的络合物,据此建立了二苯碳酰二肼光度法测定微量汞的方法。最大吸收波长为550 nm,表观摩尔吸光系数(ε550)为9.70×104L·mol-1·cm-1,Hg2+含量为0~1.4μg/mL范围内符合比尔定律,检出限为14.1μg·L-1。方法相对标准偏差(RSD,n=5)为1.1%~2.0%,回收率为98.6%~101.6%。采用本法,测定了污水及实验室废水中的微量汞,结果满意。更多还原

【Abstract】 A color react of mercury( Ⅱ) with DPC in the presence of CTMAB and OP and the determining conditions of absorbance of trace mercury were presented. The absorption maximum of this complex was found to be 550 nm,with an apparent molar absorptivity of 9. 70 × 104L·mol- 1·cm- 1. Beer’s law was obeyed in the concentration range of mercury( Ⅱ) 0 ~1. 4 μg/mL with detection limit of 14. 1 μg·L- 1for mercury. The recoveries of Hg2 +were 98. 6% ~ 101. 6% with precision of 1. 1% ~ 2. 0% RSD( n = 5). The proposed method was applied to the determination of mercury( Ⅱ) in waste water with satisfactory results.更多还原