氢化物原子荧光光谱法测定水中Hg和As

[目的]采用氢化物原子荧光光谱法同时测定水中Hg和As。[方法]以地表水体河流为研究对象,采用氢化物原子荧光光度法测定水样中Hg和As,PF6-2非色散原子荧光光度计A道测定Hg,B道测定As。仪器测试条件为还原剂1.0%Na BH4、载液5%HNO_3、载气氩气且流量300 m L/min。[结果]不同浓度的Hg-As混合标准溶液经测定,Hg和As标准曲线的相关系数分别为0.999 9和0.999 5,线性关系较好;Hg和As检出限分别为0.02和0.01μg/L;Hg和As精密度分别为0.59%和2.98%;Hg和As相对标准偏差为1.02%和1.26%。[结论]Hg符合Ⅳ类水质标准,As未超标符合Ⅰ类水质标准,Hg超出农田灌溉用水标准,不适合河流周边农田耕地灌溉。

Determination of Hg and As in Waters by Hydride Generation-Atomic Fluorescence Spectrometry

Objective] To detect the Hg and As in water by Hydride Generation-Atomic Fluorescence Spectrometry.[Method] Taking surface water in river as the research object, Hg and As in water samples were measured by atomic fluorescence spectrometry.PF6-2 non-dispersive a-tomic fluorescence photometer for A way was used to measure the Hg, B way to measure the As.The test conditions of instrument were as fol-lows: for reducing agent 1.0% NaBH4 , for carrying liquid 5% HNO3 , for carrier gas flow rate of argon 300 mL/min.[ Result] The Hg -As mixed standard solutions with different concentration were determined;the correlation coefficients of Hg and As standard curve were 0.999 9 and 0.999 5, respectively, showing good linear relationships.The detection limits of Hg and As were 0.02 and 0.01 μg/L, respectively.The preci-sions of Hg and As were 0.59% and 2.98%; the relative standard deviations with six determination to Hg and As were 1.02% and 1.02%. [Conclusion] Hg reachedⅣclass water quality standard, the As did not exceed the standard and meetⅠclass water quality standard.Since the Hg concentration was beyond the farmland irrigation water standard, the water was not suitable for irrigation to farmland around the river.