• 中文核心期刊
  • 中国科技核心期刊
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中国典型类型土壤中有机氯农药和多氯联苯成分分析标准物质的研制

Preparation of Certified Reference Materials of Organochlorine Pesticides and Polychlorinated Biphenyls in Chinese Typical Soils

  • 摘要: 目前在我国有1个有机氯农药(OCPs)分析标准物质, 3个多氯联苯(PCBs)分析标准物质; 国际上欧洲有1个OCPs分析标准物质和2个PCBs分析标准物质。美国、国际原子能机构和日本等组织研制了沉积物中OCPs、PCBs和多环芳烃的有机分析标准物质, 这些标准物质的基质性质、浓度水平与我国地质样品基质性质、实际污染情况不符。本文针对我国土壤类型的分布特点、污染特征及实际样品检测情况, 采集典型地区的土壤作为候选物, 利用传统的气相色谱-质谱法、气相色谱-串联质谱法、气相色谱-电子捕获检测器法和新技术方法——同位素稀释质谱法, 严格按照国家一级标准物质技术规范和相关标准研制了6个土壤有机分析标准物质(编号为GBW07469~GBW07474), 基本涵盖了我国典型土壤类型, 包括褐土、水稻土、黄壤土和草甸土; 定值化合物包括全国地质大调查必测的8种OCPs(α-666、β-666、γ-666、δ-666、p, p'-DDE、p, p'-DDD、o, p'-DDT、p, p'-DDT)和选测的7种PCBs(PCB28、52、101、118、153、138、180), 含量范围为3.9 μg/kg~2.31 mg/kg。此批标准物质的基质性质、目标组分的浓度水平和污染特征与实际环境样品具有较好的一致性, 而且目标物种类多, 含量范围宽, 可以满足我国不同地区、不同程度污染的土壤样品中OCPs和PCBs同时测定的质量监控需求。

     

    Abstract: In China, there is only one certified reference material (CRM) of organochlorine pesticide (OCPs) and three CRMs of polychlorinated biphenyls (PCBs) in soil. Internationally, there is one CRM of OCPs and two CRMs of PCBs in soil in Europe. The National Institute of Standards and Technology (NIST) of the USA, the National Metrology Institute of Japan (NMIJ), and the International Atomic Energy Agency (IAEA) have developed sediment CRMs for OCPs, PCBs and polycyclic aromatic hydrocarbons (PAHs). However, the matrix and contamination levels of CRMs of OCPs and PCBs do not match with the actual pollution of soil in China.In this study, according to the distribution of soil types, pollution levels of organic compounds and quality control requirements of soil samples, the typical soils were collected as candidates in China. According to the primary standard material specification, 6 CRMs of OCPs and PCBs in different soil types (GBW07469-GBW07474) have been developed. Based on the results from traditional methods including Gas Chromatography-Electron Capture Detector (GC-ECD), Gas Chromatography-Mass Spectrometry (GC-MS), Gas Chromatography-Tandem Mass Spectrometry (GC-MS/MS) and new techniques of Gas Chromatography-Isotope Dilution Mass Spectrometry (GC-IDMS), Gas Chromatography-Isotope Dilution Tandem-Mass Spectrometry (GC-IDMS-MS), certified values and expanded uncertainty for 8 OCPs and 7 PCBs are given. Meanwhile, a GC-ID-HRMS method was used to determine PCBs in candidate reference materials for comparison and validation. These CRMs cover most Chinese soil types, including cinnamon, paddy, yellow and meadow soil. The certified values of OCPs and PCBs in soils range from 3.9 μg/kg to 2.31 mg/kg. As the soils used for CRMs were collected from the field, the matrix and contamination levels of OCPs and PCBs are consistent with actual soils. The CRMs can be used in the quality control of OCPs and PCBs detection in soils of different pollution levels in different regions.

     

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