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[Objective]The research aimed to study HCH persistence in Jiaozhou Bay.[Method]Based on the investigation data in Jiaozhou Bay in April,August,September and October of 1989,we analyzed the source,distribution and migration status of HCH in sea area of Jiaozhou Bay.By using structural model of HCH environmental background value in Jiaozhou Bay,basic background value,input amount of terrestrial runoff and environmental background value of HCH in Jiaozhou Bay were calculated.[Result]Basic background value of HCH in water area of Jiaozhou Bay was 0.012 7μg/L,HCH input amount of terrestrial runoff was during 0-0.057 1μg/L,HCH content input by ocean current was 0μg/L.Then,environmental background value of HCH in water area of Jiaozhou Bay was during 0.012 7-0.069 8μg/L.[Conclusion]HCH needed long time migrating from land to sea bottom,and experienced terrestrial migration process,water migration process,settlement process and biological migration cycle process.In these migration processes,HCH was persistent,and always caused threats and harms on organism.
[Objective] The research aimed to study HCH persistence in Jiaozhou Bay. [Method] Based on the investigation data in Jiaozhou Bay in April, August, September and October of 1989, analyzed the source, distribution and migration status of HCH in sea area of Jiaozhou Bay. By using structural model of HCH environmental background value in Jiaozhou Bay, basic background value, input amount of terrestrial runoff and environmental background value of HCH in Jiaozhou Bay were calculated. [Result] Basic background value of HCH in water area of HCH content input by ocean current was 0 μg / L. Then, environmental background value of HCH in water area of Jiaozhou Bay was during 0.012 7 μg / L, HCH input amount of terrestrial runoff was during 0-0.057 1 μg / L, HCH content input by ocean current was 0 μg / 7-0.069 8 μg / L. [Conclusion] HCH needed long time migrating from land to sea bottom, and experienced terrestrial migration process, water migration process, settlement process and biological migration cycle process. These migration processe s, HCH was persistent, and always caused threats and harms on organism.