摘要
目的 建立便携式气质联用（GC-MS）法测定空气中常见挥发性有机物.方法 采用静态配气法,以高纯氮气为稀释气,配制不同质量浓度的常见挥发性有机物的混合标准气体,采用便携式GC-MS手持探头进行采样和检测,以保留时间和特征离子定性,全扫描方式定量.结果 该方法测定的12种挥发性有机物的相关系数均大于0.999;最低检出浓度为0.02～0.12 mg/m3,最低定量浓度为0.07～0.40 mg/m3;精密度为4.10％～12.50％;丙酮、苯、甲苯和邻二甲苯的相对偏差分别为-13.56％、9.03％、-10.82％和8.67％.结论 便携式GC-MS法可用于职业病危害因素中挥发性有机物的定性定量检测,能够为职业病危害因素的识别和鉴定提供技术支持.
Objective To investigate the method of portable gas chromatography-mass spectroscopy （GC-MS） for the determination of common volatile organic compounds in air.Methods The static volumetric method was used,with highly purified nitrogen gas as the diluents gas,to prepare the mixed standard gas of common volatile organic compounds with various mass concentrations.A portable GC-MS handheld probe was used for sampling and measurement,retention time and characteristic ion were used for qualitative analysis,and the full-scan mode was used for quantitative analysis.Results The correlation coefficient of 12 volatile organic compounds determined by this method was higher than 0.999.The minimum detection mass concentration was 0.02～0.12 mg/m3,and the minimum quantitative mass concentration was 0.07～0.40 mg/m3.The relative standard deviation of precision was 4.10%～12.50%;the relative deviation of acetone,benzene,methylbenzene,and dimethylbenzene was-13.56%,9.03%,-10.82%,and 8.67%,respectively.Conclusion Portable GC-MS method can be used for the qualitative analysis and quantification of volatile organic compounds in occupational hazard factors and provide technical supports for identification of occupational hazard factor.
出处
《中华劳动卫生职业病杂志》
CAS
CSCD
2016年第10期777-781,共5页
Chinese Journal of Industrial Hygiene and Occupational Diseases
基金
广东省职业病防治重点实验室（2012A061400007）
广东省医学科研基金（A2015626）
广东省医学科研基金指令性课题（C2014010）
