气候变化领域集成服务门户(CCPortal): Photochemical Degradation of Saxitoxins in Surface Waters

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DOI	10.1021/acsestwater.3c00281
	Photochemical Degradation of Saxitoxins in Surface Waters
	Norris, Kari E.; Kurtz, Tyler; Wang, Shiru; Zeng, Teng; Leresche, Frank; Rosario-Ortiz, Fernando L.
发表日期	2024
EISSN	2690-0637
起始页码	4
结束页码	2
卷号	4 期号:2
英文摘要	Photochemical degradation has been shown to be a significant pathway in the environmental fate of many cyanotoxins, compounds produced by harmful cyanobacteria. However, there has been a lack of research on the photochemical fate of saxitoxins. This project evaluated the direct and sensitized photodegradation of three saxitoxin analogues including saxitoxin (STX), gonyautoxin-2 and -3 (GTX 2/3), and n-sulfocarbamoyl-gonyautoxin-1 and -2 (C 1/2). Irradiation of STX and analogues in the presence or absence of dissolved organic matter (DOM) revealed that none of the toxins undergo direct photolysis at pH 6 or 8, and only STX and GTX 2/3 undergo sensitized photolysis at pH 8. Sensitized photolysis half-lives ranged from 1 to 10 h for STX and GTX 2/3. The contribution of reactive intermediates including singlet oxygen (O-1(2)), triplet-state dissolved organic matter ((DOM)-D-3), and hydroxyl radicals ((OH)-O-center dot) was assessed, with (DOM)-D-3 accounting for the majority of STX and GTX 2/3 degradation. Additionally, three transformation product candidates were identified for the photolysis of STX, and an electron-transfer mechanism was proposed. The kinetics, mechanism, and products of saxitoxin phototransformation are essential to understanding the persistence of these toxins in surface waters and assessing the impacts of harmful algal blooms.
英文关键词	cyanotoxins; harmful algal blooms (HABs); sensitizedphotolysis; paralytic shellfish toxins; dissolvedorganic matter (DOM); excited triplet-state DOM ((DOM)-D-3*); saxitoxins
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Water Resources
WOS类目	Environmental Sciences ; Water Resources
WOS记录号	WOS:001159421600001
来源期刊	ACS ES&T WATER
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/298909
作者单位	University of Colorado System; University of Colorado Boulder; Syracuse University; University of Colorado System; University of Colorado Boulder
推荐引用方式 GB/T 7714	Norris, Kari E.,Kurtz, Tyler,Wang, Shiru,et al. Photochemical Degradation of Saxitoxins in Surface Waters[J],2024,4(2).
APA	Norris, Kari E.,Kurtz, Tyler,Wang, Shiru,Zeng, Teng,Leresche, Frank,&Rosario-Ortiz, Fernando L..(2024).Photochemical Degradation of Saxitoxins in Surface Waters.ACS ES&T WATER,4(2).
MLA	Norris, Kari E.,et al."Photochemical Degradation of Saxitoxins in Surface Waters".ACS ES&T WATER 4.2(2024).