关键词：水质 标准 环境 水质标准 多氯联苯
Ambient Water Quality Criteria for Polychlorinated Biphenyls (PCBs)
Summary
This report is one in a series which establishes ambient water quality criteria for British Columbia. The criteria are safe conditions or levels of a variable which have province-wide application and are set to protect various water uses. This report sets criteria for polychlorinated biphenyls (PCBs) to protect freshwater and marine aquatic life, and irrigation. Criteria for drinking water, wildlife, recreation, and livestock watering were not set in this document for two main reasons: (a) a PCB criterion for drinking water is under review by Health and Welfare Canada, and (b) there is a lack of pertinent information on effects of PCBs in waters used for wildlife, livestock watering, and primary-contact recreation. Additionally, it was noted that water was a minor source of PCB body burden for humans and animals and there was more likelihood of adverse effects from PCBs in the environment due to consumption of contaminated foods. The criteria are summarized in Table 1. at the back of this report.
Aquatic life is the most sensitive water use with respect to polychlorinated biphenyls. The aquatic life (freshwater and marine) criterion recommended in this document is one (freshwater) to two (marine) orders of magnitude lower than the Canadian Water Quality Guidelines (CCREM, 1987; CCME, 1991). There are no CCREM guidelines for irrigation water use for which we have also set criteria.
A major use of the criteria is to set ambient water quality objectives. The objectives are the criteria modified or adopted to protect the most sensitive designated water use in a particular body of water. The objectives are used in the preparation of waste management Permits, Orders, or Approvals, which are the only documents to have legal standing.
TABLES
Table 1: Summary of Criteria for Polychlorinated Biphenyls (PCBs)
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