Water, Soil, Volatile Organic Compounds In The Gas Sample Analysis Methods

China’s economy has witnessed a rapid growth in recent years. However, environmental status, in the meantime, has gone through constant deteriorating stages. Industrialization has caused the large amount of organic pollutants released in the open air, rendering harm and damage to both human health and ecological environment. Volatile Organic Compounds (VOCs), among the other pollutants, have drawn researchers’greater attention due to their potential damage. VOCs can enter human body through respiration, skin contact, and food ingestion, etc. When the amount of VOCs reaches a certain limit, people will have physical discomfort, which might lead to intoxication and even death if conditions are severe. At the beginning of2013, China’s major cities have been seriously affected by widespread fog and haze, bringing more attention to VOCs and their hazards. Researchers, consequently, are facing greater challenges in prevention of atmosphere pollution:it is of dire necessity to address the underlying rule of production and transformation of VOCs in order to conduct accurate measurement and analysis of VOCs.The current research used Purge&Trap Method and Gas Chromatography-Mass Spectrometry and analyzed54kinds of VOCs in solid, liquid, and vapor phases. Analysis method of the54VOCs is systematically structured and improvements have been made to parameter optimization and key performance indicator.Water samples with concentrations of0.80μg/L,8.00μg/L,40.0μg/L are tested by standard addition recovery test, to which seven parallel experiments are done. Precision and recovery rates were acquired. The RSD and the recovery rates were1.10%～8.13%,1.28%～7.59%,2.27%～9.28%and97.9%～106%,97.5%～100%,97.3%～107%respectively。Detection limits of the target conpoumds were0.15～0.40μg/L.Soil samples with absolute quantity of4ng,40ng,400ng are tested by standard addition recovery test, to which seven parallel experiments are done. Precision and recovery rates were acquired. The RSD and the recovery rates were2.81%～8.39%,1.99%～8.01%,1.49%～8.09%and88.1%～107%,90.8%～109%,89.4%～105%respectively. Detection limits of the target conpoumds were0.08～0.46μg/Kg.Gas samples with absolute quantity of lOng,50ng,200ng in adsorption tube are tested by standard addition recovery test, to which seven parallel experiments are done. Precision and recovery rates were acquired. The RSD and the recovery rates were from2.46%to24.7%and 80.5%to113%respectively。Detection limits of the target conpoumds were0.007～0.016μg/L. The RSD is bigger when the content of compounds is low, which is in line with no cold trap and manual injection.The analysis method enjoys the advantages of simple and quick operation, high accuracy and precision, wide linear range, and low detection limit, qualified for the technical requirements of VOCs analysis and detection.