Isotopically Modified Bioassay Bridges the Bioavailability and Toxicity Risk Assessment of Metals in Bedded Sediments

Qiuling Wu; Qijing Su; Stuart L.Simpson

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Isotopically Modified Bioassay Bridges the Bioavailability and Toxicity Risk Assessment of Metals in Bedded Sediments

机译：Isotopically Modified Bioassay Bridges the Bioavailability and Toxicity Risk Assessment of Metals in Bedded Sediments

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The application of bioavailability-based risk assessment for the management of contaminated sediments requires new techniques to rapidly and accurately determine metal bioavailability.Here,we designed a multimetal isotopically modified bioassay to directly measure the bioavailability of different metals by tracing the change in their isotopic composition within organisms following sediment exposure.With a 24 h sediment exposure,the bioassay sensed significant bioavailability of nickel and lead within the sediment and determined that cadmium and copper exhibited low bioavailable concentrations and risk profiles.We further tested whether the metal bioavailability sensed by this new bioassay would predict the toxicity risk of metals by examining the relationship between metal bioavailability and metal toxicity to chironomid larvae emergence.A strong dose-toxicity relationship between nickel bioavailability(nickel assimilation rate)and toxicity(22 days emergence ratio)indicated exposure to bioavailable nickel in the sediment induced toxic effects to the chironomids.Overall,our study demonstrated that the isotopically modified bioassay successfully determined metal bioavailability in sediments within a relatively short period of exposure.Because of its speed of measurement,it may be used at the initial screening stage to rapidly diagnose the bioavailable contamination status of a site.

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来源
《Environmental Science & Technology: ES&T》 |2022年第23期|16919-16928|共10页
作者
Qiuling Wu; Qijing Su; Stuart L.Simpson;
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作者单位

State Key Laboratory of Marine Environmental Science,Key laboratory of the Ministry of Education for Coastal and Wetland Ecosystem,College of the Environment and Ecology,Xiamen University,Xiamen,Fujian 361102,China;

Centre for Environmental Contaminants Research,CSIRO Land and Water,Lucas Heights,New South Wales 2232,Australia;

Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou),Guangzhou,Guangdong 511458,China;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类环境科学、安全科学;
关键词
metal bioaccumulation; metal stable isotope; nickel bioavailability; metal mobility; sediment quality risk assessment;

Isotopically Modified Bioassay Bridges the Bioavailability and Toxicity Risk Assessment of Metals in Bedded Sediments

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