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利用气相色谱法(GC-ECD)对厦门海域贝类养殖环境(海水、底质和养殖贝类)中有机氯农药六六六(HCH)和滴滴涕(DDT)的含量进行了调查分析,初步探讨了贝类养殖环境中HCH和DDT的积累和降解规律.结果表明:厦门海域不同种贝类养殖环境中HCH和DDT的积累和降解存在明显差异,主要与各种贝类的栖息环境和生理生活习性有关.贝类养殖环境中处于积累状态(Rx>1)的主要为β-HCH、δ-HCH和γ-HCH;处于降解状态(Rx<1)的主要为α-HCH.α-HCH/γ-HCH的比值≤1.0,贝类养殖环境中的HCH来源于工业品HCH和林丹,大部分HCH为长时间残留,但尚有少量林丹输入.贝类养殖区海水中DDT主要为好氧降解,底质中主要为厌氧降解.海水中的降解产物主要为DDE,(DDD+DDE)/DDTs(p,p-DDE+p,p-DDD+o,p-DDT+p,p-DDT)的比值<0.5;底质和养殖贝类体中的降解产物主要为DDD,(DDD+DDE)/DDTs的比值>0.5,贝类养殖区底质和养殖贝类体中的DDT大部分已降解为DDD和DDE,海水中尚有少量新的DDT输入.贝类养殖环境中HCH异构体降解率的高低顺序存在一定差异,其在贝类养殖生态系中的迁移、转化过程发生了构象变化.
The content of organochlorine pesticides (HCH) and DDT (DDT) in the shellfish culture environment (seawater, sediment and shellfish) in Xiamen sea area was investigated by gas chromatography (GC-ECD) The accumulation and degradation of HCH and DDT in the shellfish culture environment were studied.The results showed that there were significant differences in the accumulation and degradation of HCH and DDT in the different shellfish culture environments in Xiamen waters and mainly related to the habitat and physiological life of various shellfish species HCH, δ-HCH and γ-HCH were mainly in the state of accumulation (Rx> 1) in the shellfish culture environment and α-HCH in the degraded state γ-HCH ratio ≤1.0, HCH in shellfish culture environment originated from industrial products HCH and lindane, most of the HCH was long-term residue, but a small amount of lindane was still imported.DHT in seawater of shellfish culture area was mainly aerobic degradation , And the anaerobic degradation was mainly in the sediment.The degradation products in seawater were mainly DDE, DDD + DDE / DDTs (p, p-DDE + p, p- DDD + o, p- DDT + p, ) Was less than 0.5. The degradation products of the substrate and cultured shellfish were mainly DDD, the ratio of (DDD + DDE) / DDTs was> 0.5. Most of the DDT in the shellfish culture zone and cultured shellfish Degraded to DDD and DDE, there is still a small amount of new DDT input in seawater.The degradation order of HCH isomers in shellfish aquaculture has some differences in order of its migration and transformation in shellfish ecosystem Variety.