Combining long-range transport and bioaccumulation considerations to identify potential Arctic contaminants.
Combining long-range transport and bioaccumulation considerations to identify potential Arctic contaminants.
复制标题
结合远距离迁移和生物累积考虑因素来识别潜在的北极污染物。
DOI：
10.1021/es7028679
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发表时间：
2008
影响因子：
11.4
通讯作者：
M. McLachlan
中科院分区：
文献类型：
--
作者：
Gertje Czub;F. Wania;M. McLachlan
识别潜在的北极污染物需要评估化学品的长距离迁移和生物累积性，尤其是在北极土著居民中。为此，将非稳态区域平均全球分布模型与描述因纽特人从海洋饮食中暴露的非稳态生物累积模型联系起来。使用北极污染和生物累积潜力（AC-BAP）评估了具有不同分配特性组合的假设的完全持久性化学品在低纬度地区排放后在北极环境中富集的潜力，以及在北极食物链中生物累积的潜力。 AC-BAP定义为人体所承受的化学物质负荷与累积排放到全球环境的化学物质数量的商。对于具有中等挥发性和疏水性的假设多媒体化学品，获得了最高的 AC-BAP 值（高达 3.7 x 10(-11) person(-1)）。 3.5 < log K(OW) < 8.5 和 log K(OA) > 6 的完全持久性化学品的 AC-BAP 值至少为最大值的 10%，这表明多种化学品如果具有持久性，则可能成为北极污染物。此外，模拟结果表明，化学物质的生物累积潜力对成为人类北极污染物的总体潜力的影响比其远距离迁移的潜力更大。该建模练习展示了如何将化学生物累积的非稳态模型与全球化学归宿的非稳态模型联系起来，为评估化学品在偏远地区成为污染物的可能性提供了宝贵的工具。
The identification of potential Arctic contaminants requires an assessment of both the long-range transport and the bioaccumulation of the chemicals, most particularly in the indigenous inhabitants of the Arctic. For this purpose, a nonsteady state, zonally averaged global distribution model was linked to a nonsteady state bioaccumulation model describing Inuit exposure from a marine diet. The potential of hypothetical, perfectly persistent chemicals with varying combinations of partitioning properties to enrich in the Arctic environment following emission in the lower latitudes and, additionally, to bioaccumulate in the Arctic food chains was evaluated using the Arctic contamination and bioaccumulation potential (AC-BAP). The AC-BAP is defined as the quotient of the human body burden of the chemical and the quantity of chemical cumulatively emitted to the global environment. The highest AC-BAP values (up to 3.7 x 10(-11) person(-1)) were obtained for hypothetical multimedia chemicals with intermediate volatility and hydrophobicity. Perfectly persistent chemicals with 3.5 < log K(OW) < 8.5 and log K(OA) > 6 had AC-BAP values of at least 10% of the maximum value, indicating that a broad range of chemicals are potential Arctic contaminants if they are persistent. Moreover, the simulation results suggest that a chemical's potential to bioaccumulate has a stronger impact on the overall potential to become an Arctic contaminant in humans than its potential for long-range transport. This modeling exercise demonstrates how linking nonsteady state models of chemical bioaccumulation and of global chemical fate can provide a valuable tool for assessing a chemical's potential to be a contaminant in remote regions.