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目的:建立石墨炉原子吸收测定工作场所空气中钡的方法。方法:微孔滤膜采集工作场所空气中的钡,经超声洗脱后用涂钽石墨管电热原子吸收测定。结果:用涂钽石墨管可以有效地消除形成碳化物的影响和记忆效应。方法的测定范围为0~100μg/L,回归方程A=0.00235 c+0.0327,r=0.9997;检出限2.5×10-11g,最低检出浓度0.003 mg/m3;平均洗脱效率>94%;相对标准偏差(RSD)为2.6%~4.1%。结论:本方法适用于工作场所空气中钡的测定。
Objective: To establish a method for the determination of barium in the air by graphite furnace atomic absorption spectrometry. Methods: The microporous membrane was used to collect the barium in the air of the workplace and was measured by electrothermal atomic absorption after coated with tantalum graphite tube by ultrasonic elution. Results: Tantalum coated graphite tube can effectively eliminate the effects of carbide formation and memory effect. The determination range of the method was 0 ~ 100μg / L, the regression equation A = 0.00235 c + 0.0327, r = 0.9997; the detection limit was 2.5 × 10-11g, the minimum detectable concentration was 0.003 mg / The relative standard deviation (RSD) was 2.6% -4.1%. Conclusion: This method is suitable for the determination of barium in the air of the workplace.