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首页> 外文期刊>Environmental toxicology and chemistry >MEASUREMENT OF TOTAL POLYCYCLIC AROMATIC HYDROCARBON CONCENTRATIONS IN SEDIMENTS AND TOXIC UNITS USED FOR ESTIMATING RISK TO BENTHIC INVERTEBRATES AT MANUFACTURED GAS PLANT SITES
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MEASUREMENT OF TOTAL POLYCYCLIC AROMATIC HYDROCARBON CONCENTRATIONS IN SEDIMENTS AND TOXIC UNITS USED FOR ESTIMATING RISK TO BENTHIC INVERTEBRATES AT MANUFACTURED GAS PLANT SITES

机译：沉积物和有毒物质中总多环芳烃浓度的测量，用于估算制造的天然气厂地底无脊椎动物的风险

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The U.S. Environmental Protection Agency's (U.S. EPA) narcosis model requires the measurement of 18 parent and 16 groups of alkyl polycyclic aromatic hydrocarbons (PAHs) (so-called 34 PAHs) in sediments to calculate the number of PAH toxic units (TU) available to benthic organisms. If data for the 34 PAHs are not available, the U.S. EPA proposes estimating the risk by multiplying the TU for 13 parent PAHs by 11.5 (95% confidence interval) based on data from 488 sediments. This estimate is overly conservative for PAHs from pyrogenic manufactured gas plant (MGP) processes based on the analysis of 45 sediments from six sites. Parent PAHs contributed approximately 40% of the total concentrations and TU for MGP sediments. In contrast, parent PAHs from diesel fuel and petroleum crude oil contributed only 2 and 1%, respectively, of the PAH concentrations and TU, compared to approximately 98 to 99% contributed by the alkyl PAHs. Statistical comparison of the TU based on the measured 34 alkyl and parent PAHs and those based on only 13 parent PAHs demonstrated that a factor of 4.2 (rather than 11.5) is sufficient to estimate total TU within a 95% confidence level for MGP sites. Similarly, measurement of parent PAHs is sufficient to accurately estimate the total 34 alkyl and parent PAH concentrations for MGP-impacted sediments.
机译：美国环境保护局（US EPA）的麻醉作用模型要求测量沉积物中18个母体和16组烷基多环芳烃（PAH）（所谓的34 PAH），以计算可用于PAH毒性单位的数量。底栖生物。如果没有34种PAH的数据，美国EPA建议根据13种母体PAH的TU乘以488个沉积物的数据乘以11.5（95％置信区间）来估算风险。根据对六个地点的45个沉积物的分析，此估算对于热解天然气工厂（MGP）工艺中的PAHs过于保守。母体PAH占MGP沉积物总浓度和TU的约40％。相比之下，柴油和石油原油中的母体PAH分别仅占PAH浓度和TU的2％和1％，而烷基PAH约占98％至99％。基于测得的34个烷基和母体PAH以及仅基于13个母体PAH的TU的统计比较表明，因子4.2（而不是11.5）足以估计MGP站点在95％置信度内的总TU。同样，母体PAH的测量足以准确估算MGP所影响沉积物的总烷基和母体PAH的总浓度34。

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