挥发性有机物测定中空白试验的影响因素分析

Analysis of Influencing Factors of Blank Experiment in Determination of Volatile Organic Compounds

为避免空白试验对痕量分析结果的正确度、精密度和方法检出限的影响,本文探讨了大气和水质中挥发性有机物测定的空白试验影响因素。结果表明,本研究中未处理的纯水三氯甲烷浓度为0.2μg/L,低苯级二硫化碳的甲苯含量为0.35 mg/L。活性炭管、气袋目标物均有检出,实验室环境、标液储存场所均可对空白造成影响。为保证试验数据的准确、可靠,本研究针对以上影响因素提出了相应的控制措施,以期为挥发性有机物测定中空白值的消除提供参考。

In order to avoid the influence of blank experiment on the accuracy,precision and detection limit of trace analysis results,the factors affecting the blank test value in the determination of volatile organic compounds in atmosphere and water were discussed.The research results indicate that the concentration of trichloromethane in untreated water is 0.2μg/L,the toluene content of low benzene level carbon disulfide is 0.35 mg/L.The target substances in activated carbon tubes and air bags have been detected,and the storage place of standard solution can affect the blank.To ensure the accuracy and reliability of experimental data,the corresponding control measures were put forward according to the influencing factors,which provide reference for eliminating the blank value in the determination of volatile organic compounds.