偶合化学发光法测定环境水样中的痕量亚硝酸根

Determination of trace nitrite in water samples by coupling chemiluminescence analysis

将亚硝酸盐在酸性条件下氧化亚铁氰化钾为铁氰化钾的反应 ,和尿酸 铁氰化钾 鲁米诺化学发光反应偶合一起 ,建立了一种间接测定亚硝酸根离子的新方法。讨论了酸度、反应物浓度、干扰离子等因素的影响。方法的检出限为5 .0× 1 0 - 1 1 g/mL ,对环境水样样品进行了平行测定 (n =1 1 ) ,其相对标准偏差为1 .8%～ 3 2 % ,线性范围为 1 .0× 1 0 - 9g/mL～ 1 .0× 1 0 - 5g/mL ,回收率为 94.3%～ 1 0 5 3%。

Under optimal condition, the linear range for the determination of NO 2 - was 1.0×10 -9 g/mL～1.0×10 -5 g/mL with detection limit of 5.0×10 -11 g/mL and relative standard deviation of 1.8 %～3.2 %( n =11). It was applied to the determination of trace nitrite in water samples of the environment with satisfactory results.