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首页> 外文期刊>Environmental Science & Technology >Temporal Trends of Perfluoroalkyl Compounds with Isomer Analysis in Lake Trout from Lake Ontario (1979-2004)
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Temporal Trends of Perfluoroalkyl Compounds with Isomer Analysis in Lake Trout from Lake Ontario (1979-2004)

机译：安大略湖鳟鱼全氟烷基化合物随异构体分析的时间趋势（1979-2004年）

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摘要

The temporal trends of perfluoroalkyl compounds (PFCs), including C7-C15 perfluorocarboxylates (PFCAs), perfluorosul-fonates (PFSAs) and heptadecafluorooctane sulfonamide (PFOSA), were determined in lake trout collected between 1979 and 2004 from Lake Ontario. The average concentrations of total PFSAs (±standard error of the mean; range) increased from 20 ng g~(-1) wet weight (±4; 8-26) in 1979, peaked at 70 ng g~(-1) (±7; 58-91) in 1993, and were 46 ng g~(-1) (±10; 30-83) in 2004, with perfluorooctane sulfonate (PFOS) as the most abundant PFC. The PFCAs exhibited similar temporal variation, with concentrations increasing from 1.4 ng g~' (±0.1; 0.9-1.9) in 1979 to 9.4 ng g~1 (±3.1; 3-17) in 1988, and were 6.8 ng g~(-1) (±1.0; 4.5-9.8) in 2004. Individual mean PFCA concentrations varied between 0.2 and 2 ng g~(-1) (wet weight). Perfluorodecane sulfonate (PFDS) and PFOSA were the only compounds showing a declining trend in the past decade, after reaching a peak value in 1993. Branched C11 and C13 PFCA isomers were detected in the lake trout and confirmed in Niagara River suspended sediments, with trends in both matrices suggesting that declining emissions or use of products containing these isomers in part account for the observed PFCA trends in the mid-1990s. However, the most recent samples, comprised almost exclusively of linear isomers, indicate that current PFCA sources to Lake Ontario result from the telomerization process of linear telogens.
机译：在1979年至2004年之间从安大略湖采集的鳟鱼中确定了全氟烷基化合物（PFC）的时间趋势，包括C7-C15全氟羧酸盐（PFCA），全氟磺酸盐（PFSA）和七氟辛烷磺酰胺（PFOSA）。总PFSA的平均浓度（平均值的标准误;范围）从1979年的20 ng g〜（-1）湿重（±4; 8-26）开始增加，最高达到70 ng g〜（-1）（ 1993年为±7; 58-91），2004年为46 ng g〜（-1）（±10; 30-83），其中全氟辛烷磺酸盐（PFOS）是最丰富的PFC。 PFCAs表现出类似的时间变化，其浓度从1979年的1.4 ng g〜'（±0.1; 0.9-1.9）增加到1988年的9.4 ng g〜1（±3.1; 3-17），并且为6.8 ng g〜（ -1）（±1.0; 4.5-9.8），2004年。个人平均PFCA浓度在0.2至2 ng g〜（-1）（湿重）之间变化。全氟癸烷磺酸盐（PFDS）和PFOSA是过去十年中仅有的呈下降趋势的化合物，在1993年达到峰值之后。在湖鳟鱼中检测到支链C11和C13 PFCA异构体，并在尼亚加拉河悬浮沉积物中确认了这种趋势在这两个矩阵中，这表明减少的排放或使用包含这些异构体的产品在一定程度上解释了1990年代中期观察到的PFCA趋势。但是，最近的样品几乎全部由线性异构体组成，表明当前通往安大略湖的PFCA来源是线性端粒的端粒化过程产生的。

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