| Over the past twenty years, along with the fast and violent development of Chinese industry, agriculture and urban life, environmental pollution caused by swift economic development has worsened accordingly. The writer, throμgh collecting the underground water samples from different regions of China and using GC-MS for detection and screening, formulated a more comprehensive detection methods for semi-volatile organic compounds in groundwater.In this paper, six typical areas of China was selected as sample collection points; throμgh the literature review and laboratory preparatory work and by comparing the advantages and disadvantages of a variety of pre-treatment methods, the classical extraction method - liquid-liquid extraction method was adopted for pre-treatment stage work. As for equipment testing, throμgh referring to the U.S. Environmental Protection Agency's testing methods on the semi-volatile organic compounds detection,as well as combining laboratory equipment conditions, instrument parameters was optimized on the basis of United States Environmental Protection Agency No. 8270D method. Classified testing was made to the selected 98 kinds of semi-volatile organic compounds. By the time interval of peaks on mass spectrometry, the 98 kinds of semi-volatile organic compounds were classified into acidic semi-volatile organic compounds, neutral and basic semi-volatile organic compounds, and pesticides-class semi-volatile organic compounds. Parallel samples in corresponding concentration was tested to calculate the precision and accuracy, and then to calculate the organic compounds instrument detection limit and reporting limit. Based on the reliable test results of the quality control samples in Each test results, the test results of the selected groundwater sample were analyzed.
|
PDF Full Text Request