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本文综合国内外氢化物发生装置和原子化器的特点,对日立508型砷分析仪进行了改进,并利用改进的砷分析仪,对水样中砷与硒的最佳测定条件,一些常见共存元素的干扰及消除干扰的方法作了研究。改进后的508型砷分析仪,其灵敏度比原来提高约两个数量级,在最佳测定条件下,砷与硒的特征浓度分别为0.20ng/ml·1%A和0.28ng/ml·1%A;检测极限(ng/ml,3σ)由原来的38.2ng/ml和54.7ng/ml下降为0.12ng/ml和0.19ng/ml,在水样中加入不同量的砷(Ⅲ)和硒(Ⅳ)标准,测得其回收率在94.0～103.2%之间,当加入砷(Ⅲ)或硒(Ⅳ)的标准为5.00ng/ml,测定11次后计算其变异系数是5.94%和4.56%。本法自动化程度比原来提高,操作简便快速,分析成本低,方法灵敏度高,重现性较好。许多样品不需特殊处理,可直接进行测定,结果令人满意。
Based on the characteristics of hydride generator and atomizer at home and abroad, this paper improves the Hitachi 508 arsenic analyzer and uses the improved arsenic analyzer to determine the best determination conditions of arsenic and selenium in water sample, Element interference and elimination of interference methods were studied. The modified arsenic analyzer 508 has a sensitivity about two orders of magnitude higher than the original one. Under the optimum conditions, the concentrations of arsenic and selenium are 0.20 ng / ml · 1% A and 0.28 ng / ml · 1% A; The limits of detection (ng / ml, 3σ) were reduced from 38.2 ng / ml and 54.7 ng / ml to 0.12 ng / ml and 0.19 ng / ml, respectively. Different amounts of arsenic (Ⅲ) and selenium Ⅳ), the recoveries were between 94.0 and 103.2%. When the standard of arsenic (Ⅲ) or selenium (Ⅳ) was 5.00ng / ml, the coefficient of variation was calculated to be 5.94% and 4.56% . The degree of automation of the law than the original increase, simple and quick operation, low cost, high sensitivity, good reproducibility. Many samples without special treatment, can be directly measured, the results are satisfactory.