流动注射石英管原子吸收法测定微量总汞

Determination of Mercury with a Flow Injection Quartz Tube Atomic Absorption Spectrometry

建立了一套流动注射石英管原子吸收光谱法测定土壤、植物和药品等样品中微量Hg的方法 ,研究了酸度、载液和还原液流速及其浓度、氩气流量等条件对测定结果的影响。采用五氧化二钒、硝酸、硫酸进行消解 ,可获得可靠的分析结果。方法特征量为 5 9pg,检出限为 0 .0 2 8μg L;相对标准偏差为 1 .60 %～ 3 86% ;回收率为 94 %～ 1 0 2 %。

A method was developed for the determination of micro mercury in the soil, plants and the traditional Chinese medicine using flow injection quartz tube-atomic absorption spectrometry. The effect of the factors such as acidity,. the carrier solution, the flow rate of reductive solution and argon gas, etc. on the determination was studied. When vanadic oxide, nitric acid and sulfuric acid were used to decompose the sample reliable result could be obtained. The characteristic mass of the method is 59 pg, the detection limit is 0.028 mug/L, RSD is < 3.9% and the recovery is in the range of 94% &SIM; 102%.