GB/T 27858-2011

Environmental toxicology laboratories and chemical assessment agencies use this standard to test the long-term toxicity of chemicals to benthic chironomid larvae. By spiking the test substance into water, it simulates exposure scenarios such as pesticide spray drift to evaluate effects on chironomid emergence and development. This standard is crucial for chemical environmental risk assessment and ecotoxicological research.

环境毒理学实验室和化学品评估机构使用该标准来测试化学品对水生底栖生物摇蚊幼虫的长期毒性。通过将受试物质加入水中，模拟农药喷撒漂移等暴露场景，评估化学品对摇蚊羽化和发育的影响。该标准对于化学品环境风险评估和生态毒理学研究具有重要意义。

This standard specifies a test method for assessing the toxicity of chemicals to chironomids in a sediment-water system using the spiked water method, applicable for evaluating the effects of long-term exposure on freshwater chironomid larvae. First-instar larvae are exposed to sediment-water systems containing different concentrations of the test substance, and toxicity is assessed by measuring emergence rate and development rate. The standard details test vessels, sediment preparation, water quality requirements, test design, exposure conditions, and data analysis methods, with quality control requirements such as a control emergence rate of at least 70%. It provides a standardized testing approach for chemical environmental risk assessment.

本标准规定了加标于水法评估沉积物-水系统中摇蚊毒性的试验方法，适用于评估化学品长期暴露对淡水摇蚊幼虫的影响。试验将一龄摇蚊幼虫暴露于含不同浓度受试物的沉积物-水系统中，通过测量羽化率和发育速率评估毒性效应。标准详细规定了试验容器、沉积物配制、水质要求、试验设计、暴露条件和数据分析方法，并提出了质量控制要求，如对照组羽化率不低于70%。该标准为化学品环境风险评估提供了标准化的测试方法。