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首页> 外文期刊>Environmental toxicology and chemistry / >Comparison of Substance‐Based and Whole‐Effluent Toxicity of Produced Water Discharges from Norwegian Offshore Oil and Gas Installations
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Comparison of Substance‐Based and Whole‐Effluent Toxicity of Produced Water Discharges from Norwegian Offshore Oil and Gas Installations

机译：Comparison of Substance‐Based and Whole‐Effluent Toxicity of Produced Water Discharges from Norwegian Offshore Oil and Gas Installations

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When assessing the environmental risks of offshore produced water discharges, it is key to properly assess thetoxicity of this complex mixture. Toxicity can be assessed either through the application of whole‐effluent toxicity (WET)testing or based on its substance‐based chemical composition or both. In the present study, the toxicity assessed based onWET and substance‐based was compared for 25 offshore produced water effluents collected for the Norwegian implementationof the Oslo–Paris convention risk‐based assessment program. The objectives were, firstly, to examine theconcurrence between toxicity estimates derived from these two lines of evidence; and, secondly, to evaluate whether toxicityof produced water discharges predicted from substance‐based data is adequately addressed in comparison with groundtruth reflected by WET. For both approaches, 50 hazardous concentrations (HC50s) were calculated. For at least 80 of theeffluents the HC50s for the two approaches differed by less than a factor of 5. Differences found between the two approachescan be attributed to the uncertainty in the estimation of the concentration of production chemicals that stronglyinfluences the substance‐based estimated toxicity. By evaluating effluents on a case‐by‐case basis, additional causes werehypothesized. Risk management will particularly benefit from the strength of risk endpoints from both approaches bymonitoring them periodically in conjunction over time. This way (in)consistencies in trends of both indicators can be evaluatedand addressed.

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