Untargeted Screening and Distribution of Organo-Bromine Compounds in Sediments of Lake Michigan

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• 作者：Hui Peng ; Chunli Chen ; Jenna Cantin ; David M. V. Saunders ; Jianxian Sun ; Song Tang ; Garry Codling ; Markus Hecker ; Steve Wiseman ; Paul D. Jones ; An Li ; Karl J. Rockne ; Neil C. Sturchio ; John. P. Giesy
• 刊名：Environmental Science & Technology
• 出版年：2016
• 出版时间：January 5, 2016
• 年：2016
• 卷：50
• 期：1
• 页码：321-330
• 全文大小：720K
• ISSN：1520-5851

文摘

Previously unreported natural and synthetic organo-bromine compounds (NSOBCs) have been found to contribute more than 99% of total organic bromine (TOB) in environmental matrices. We recently developed a novel untargeted method (data-independent precursor isolation and characteristic fragment, DIPIC-Frag) and identified ～2000 NSOBCs in two sediments from Lake Michigan. In this study, this method was used to investigate the distributions of these NSOBCs in 23 surficial samples and 24 segments of a sediment core from Lake Michigan. NSOBCs were detected in all 23 surficial samples and exhibited 10- to 100-fold variations in peak abundance among locations. The pattern of distributions of NSOBCs was correlated with depth of the water column (r² = 0.61, p < 0.001). Hierarchical cluster analysis showed that sediments in close proximity exhibited similar profiles of NSOBCs. Distributions of NSOBCs in 24 segments of a sediment core dated from 1766 to 2008 were investigated, and samples from similar depths exhibited similar profiles of NSOBCs. NSOBCs were grouped into four clusters (soft-cluster analysis) with different temporal trends of abundances. 515 and 768 of the NSOBCs were grouped into cluster 1 and cluster 3 with increasing temporal trends, especially since 1950, indicating that abundances of these compounds might have been affected by human activities.