工作场所空气中二氧化钛测定的电感耦合等离子体发射光谱法

Determination of titanium dioxide in the air of workplace by inductivehy coupled plasma optical emission spectrometry

目的 建立工作场所空气中二氧化钛测定的电感耦合等离子体发射光谱（ICP-OES）法.方法 工作场所气溶胶态的二氧化钛用滤膜收集器采集,在硝酸、氢氟酸和去离子水体积比为4：1：1的溶剂体系下经微波消解后,定容至25 ml,用ICP-OES法进行测定.结果 该方法采用微孔滤膜采集工作场所空气中二氧化钛样品的效率〉95%;方法的线性范围为10~500μg/ml,最低定量浓度为0.72 mg/m3（以采集150 L空气样品计）,最高定量浓度为21.7 mg/m3（以采集960 L空气样品计）,加标回收率为99.0%~102.0%,批内精密度为0.5%~3.2%,批间精密度为1.7%~3.5%.结论 该方法符合GBZ/T 210.4-2008《职业卫生标准制定指南第4部分：工作场所空气中化学物质测定方法》要求,适用于工作场所空气中二氧化钛的采集和测定.

Objective To establish the method for determination of titanium dioxide in the air of workplace by inductivehy coupled plasma optical emission spectrometry （ICP-OES）. Methods The titanium dioxide was collected by filter membrane and then digested by microwave digestion apparatus in the mixed solvents （HNO3：HF：H2O=4：1：1）, dilutedto 25 ml and detected by ICP-OES. Results The sampling efficiency was higher than 95%;the linearity of ICP-OES was good at the range of 10-500μg/ml, the minimum quantitation concentration was 0.72 mg/m3（as collecting 150 L air sample）, the maximum quantitation concentration was 21.7 mg/m3（as collecting 960 L air sample）, the recovery was ranged from 99.0%-102.0%, the RSD of intra- and inter- batch precision were 0.5%-3.2%and 1.7%-3.5%, respectively. Conclusion The sampling method and determination method meet the requirements of guide for establishing occupational health standards-part 4：determinatin methods of air chemicals in workplace（GBZ/T 210.4-2008）, and areapplys to the collection and determination of TiO2 in the air of workplace.