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    "Water Quality Determination of Semi-volatile Organic Compounds by Gas Chromatography-Mass Spectrometry" Soliciting Opinions

    • Last Update: 2021-06-13
    • Source: Internet
    • Author: User
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      [ Policies and Regulations of Chemical Machinery and Equipment Network ] According to the classification of organics by the World Health Organization in 1989: semi-volatile organic compounds with boiling points ranging from 240 ℃ ~ 260 ℃ to 380 ℃ ~ 400 ℃.
    In addition, semi-volatile organic compounds have the following definitions: US EPA states that semi-volatile organic compounds are organic compounds with a boiling point higher than water at room temperature.
    Another definition is organic compounds with a retention time between C16 and C22 on the GC.
    In fact, this writing is not a very strict definition, but in general, semi-volatile organic compounds are a large group of organic compounds with slower volatility than volatile organic compounds.
    They are easier to migrate in water, soil, air, biological media and other media.
    Transformation, which exists in water and soil for a long time, harms human health through bioaccumulation.

     
    Chemical Machinery and Equipment Network Policies and Regulations Chemical Machinery and Equipment
      Broadly speaking, due to the large molecular weight and high boiling point of semi-volatile organic compounds, they are more difficult to degrade and exist for longer in the environment than volatile organic compounds.
    People are concerned about semi-volatile organic compounds that are physiologically toxic, carcinogenic, mutagenic, teratogenic, persistent, and environmental hormones.
    For example, the first batch of 12 persistent organic compounds controlled by the Stockholm Convention are all semi-volatile organic compounds.
    Among the 129 priority pollutants announced by the US EPA, except for 15 of which are metals and inorganics, the rest are organic.

     

      It is understood that harmful semi-volatile organic compounds in drinking water, sewage, and surface water, such as phenols, anilines, polycyclic aromatic hydrocarbons, phthalate esters, etc.
    , cause great damage to the environment.
    Among them, polycyclic aromatic hydrocarbons are highly carcinogenic.
    Long-term exposure to these pollutants will cause chronic poisoning of the human body, cause cancer, and directly affect the reproductive and nervous system, and seriously endanger human health.
    Therefore, the analysis of semi-volatile organic compounds in water is an important part of environmental analysis.
    In my country’s "Surface Water Environmental Quality Standards" (GB 3838-2002), "Drinking Water Hygiene Standards" (GB 5749-2006), Standards such as "Petrochemical Industry Pollutant Discharge Standard" (GB 31571-2015), "Urban Wastewater Treatment Plant Pollutant Discharge Standard" (GB 18918-2002) and other standards stipulate the standard values ​​of some semi-volatile organic compounds.

     

      In order to implement the "Environmental Protection Law of the People's Republic of China" and the "Water Pollution Prevention Law of the People's Republic of China", establish a fast and sensitive monitoring and analysis method for semi-volatile organic compounds in water, standardize ecological environment monitoring, protect water quality and environmental safety, and ensure public drinking water For safety, the Ministry of Ecology and Environment has compiled a draft of the National Ecological Environment Standard "Determination of Semi-volatile Organic Compounds in Water Quality by Gas Chromatography-Mass Spectrometry" for comments.

     

      This standard specifies the gas chromatography-mass spectrometry method for the determination of semi-volatile organic compounds in water.
    It is suitable for the screening, identification and quantitative analysis of 64 semi-volatile organic compounds in surface water, groundwater, industrial wastewater and domestic sewage.
    For specific types of compounds, On the basis of this screening, an exclusive analytical method should be selected for determination.
    The standard stipulates that when the sampling volume is 1000 ml and the sample volume is 1.
    0 ml, the detection limit of the method is 0.
    1 μg/L~2 μg/L, and the lower limit of determination is 0.
    4 μg/L~8 μg/ L.

     

      This standard is issued for the first time.
    All relevant units and individuals can make comments and suggestions.
    The deadline for soliciting comments is May 16, 2021.

     

      Original title: "Determination of Semi-volatile Organic Compounds in Water Quality by Gas Chromatography-Mass Spectrometry" Soliciting Opinions
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