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对洪湖水体、表层沉积物和特色水产品(鲫鱼、莲藕等)进行了调查采样,采用美国EPA方法进行了有机氯农药的提取,用带有电子捕获器的气相色谱(GC-ECD)进行了有机氯农药含量的测定。结果表明:六六六和滴滴涕各异构体在湖水、表层沉积物、特色水产品中绝大部分都有检出,湖水中六六六和滴滴涕的质量浓度远低于其在表层沉积物和特色水产品中的质量分数,这与有机氯农药疏水亲颗粒和溶脂性的特性有关。以分配系数、生物积累因子和生物区系-底泥生物积累因子为基础,建立了洪湖特色水产品对水体及表层沉积物中有机氯农药的积累模式,所得结果能够为洪湖湿地保护与生态恢复措施的决策与制定提供科学依据。
Samples of Honghu waters, surface sediments, and specialty aquatic products (crucian carp, lotus root, etc.) were investigated and sampled. Organochlorine pesticides were extracted using the EPA method of the United States. Gas chromatography (GC-ECD) with electron capture Determination of organochlorine pesticides. The results showed that the isomers of BHC and DDT were detected in most of the lake water, surface sediments and special aquatic products. The concentrations of BHC and DDT in the lake were much lower than those in the sediments and The mass fraction of characteristic aquatic products, which is related to the properties of organophosphate pesticide hydrophobic parent particles and lipid solubility. Based on the distribution coefficient, bioaccumulation factor and biological flora-sediment bioaccumulation factor, the accumulation pattern of organochlorine pesticides in water bodies and surface sediments of Honghu characteristic aquatic products was established, and the results obtained can be used for the conservation and ecological restoration of Honghu Lake wetland Provide a scientific basis for the decision-making and formulation of measures.