Quantitative structure-activity relationship study on the degradation of polyhalogenated carbazoles by sulfidated zero-valent iron/peroxymonosulfate system

Zhu, Luxiang; Sun, Zhuyu; Wen, Jin; Wang, Xiang; Liu, Yanan; Zhao, Xiaoxiang; Liu, Yanbiao

doi:10.1016/j.jece.2022.107244

Cited by 4 publications

(1 citation statement)

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“…Since discoveries of significant quantities of polyhalogenated carbazoles (PHCZs) in sediments of Lake Michigan, , the occurrence of PHCZs in soils, − sediments, − water, , and biota − from various regions of the world has been reported. Recent studies on their sources, , transformation, − and toxicity − have also increased our understanding of the behavior of these compounds in the environment. Recent reports of PHCZs in drinking water raise concerns about their effects on public health. , Together, the results of these studies indicate a need for more focused studies on this chemical group of emerging concern.…”

Section: Introductionmentioning

confidence: 99%

Polyhalogenated Carbazoles in Sediments of Lower Laurentian Great Lakes and Regional Perspectives

Zhou

et al. 2022

ACS EST Water

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This work continued investigations of polyhalogenated carbazoles (PHCZs) in sediments of the Laurentian Great Lakes. A total of 77 Ponar grab samples plus approximately 300 segments from 12 sediment cores from Lakes Erie and Ontario were analyzed for carbazole (CZ) and 26 PHCZs. CZ is widespread in sediments of all five Great Lakes, particularly in Lake Erie where it has accumulated >100 tonnes, which is similar to that of total polychlorinated biphenyls. Among the 26 PHCZs, 3-bromo- (3-BCZ) and 3-chloro- (3-CCZ) carbazoles exhibited the greatest mass loads in Lakes Ontario and Erie, although their stratigraphic sediment records suggest peaking of input occurred before 1980 and are now decreasing. Of emerging concern are several dibromocarbazoles, which exhibit rapid increases in net fluxes to sediment since the 1980s. Accumulation of PHCZs that are considered to be of natural origin decreases in an eastward and southward transect across the region, opposite to the trend for those that are predominantly of human activity related origin. The dependences on water depth and sediment organic matter content differ among PHCZs and their categories. Results presented here demonstrate the inter-related influences of natural processes and human activities on occurrences, fates, and dispositions of PHCZs and likely other organohalogens in the Great Lakes.

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