超声洗脱-离子色谱法测定无机化学实验室环境空气中的氟化物

Determination of Fluorides in the Air of Inorganic Chemistry Laboratory Environment by Ultrasonic Elution Ion Chromatography

采用超声洗脱改进《工作场所空气有毒物质测定氟化物》(GBZ/T160.36)中盐酸浸取、滤纸捣碎成浆的样品前处理后利用离子色谱法测定,简化分析流程,提高效率。以无机化学实验室环境空气为样品采集对象进行方法验证,结果表明,方法检出限为0.01 mg/L,最低检出质量浓度0.02 mg/m^(3)。对样品进行7次平行测定,相对标准偏差分别为0.29%、0.57%,均小于GBZ/T 160.36中平均相对标准偏差4.6%。测定不同浓度标准质控样与电极法对比,两方法相对误差均<10%,且本法小于电极法。

Ultrasonic elution was used to improve the sample pretreatment of hydrochloric acid extraction and filter paper crushing into pulp in the Determination of Fluorides in Workplace Air Toxic Substances(GBZ/T160.36).Ion chromatography was used to simplify the analysis process and improve efficiency.The method validation was conducted using the ambient air of the inorganic chemistry laboratory as the sample collection object.The results showed that the detection limit of the method was 0.01 mg/L,and the minimum detected mass concentration was 0.02 mg/m^(3).Seven parallel measurements were conducted on the samples,with relative standard deviations of 0.29%and 0.57%,both of which were lower than the average relative standard deviation of 4.6%in GBZ/T 160.36.Comparing the determination of different concentrations of standard quality control samples with the electrode method,the relative errors of both methods are less than 10%,and this method is smaller than the electrode method.