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首页> 外文期刊>Environmental Science & Technology >Organotin Release from Polyvinyl Chloride Microplastics and Concurrent Photodegradation in Water: Impacts from Salinity, Dissolved Organic Matter, and Light Exposure
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Organotin Release from Polyvinyl Chloride Microplastics and Concurrent Photodegradation in Water: Impacts from Salinity, Dissolved Organic Matter, and Light Exposure

机译：聚氯乙烯微塑料中有机锡的释放和水中的同时光降解：盐度，溶解的有机物质和光照的影响

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摘要

Photochemical weathering leads to degradation of microplastics and releases chemical additives, polymeric fragments, and/or byproducts. This study evaluated the release kinetics of organotin compounds (OTCs) from three different sized (10-300 mu m) polyvinyl chloride (PVC) microplastics under UV- and visible light irradiation. Four OTCs, dimethyltin (DMT), monomethyltin (MMT), dibutyltin (DBT), and monobutyltin (MBT), were found to release from PVC particles after 24 h leaching in darkness ranging from 2 to 20 mu g.g-PVC-1. Under UV/visible light irradiation, only DMT and DBT were detectable, whereas MMT and MBT were not detected due to rapid photodegradation. The total tin concentrations (including organic and inorganic tins) in the aqueous phase monotonically increased under light exposure. By contrast, they reached plateaus after 24 h in darkness, confirming the photodegradation of OTCs. A release kinetics model was established and correctly interpreted the microplastics size effect on the OTC release process. Finally, the impacts of salinity and dissolved organic matter (DOM) were investigated. The release and photodegradation of OTCs were both inhibited at high salinity conditions, probably due to the enhanced readsorption of OTCs on PVC microplastics and the formation of halogen radicals that were less reactive toward neutral OTCs. The presence of DOM, however, increased OTCs release probably because the excited state triplet DOM ((DOM)-D-3*) formed and reacted with OTCs from PVC microplastics.
机译：光化学风化导致微塑料降解并释放化学添加剂，聚合物碎片和/或副产物。这项研究评估了三种不同尺寸（10-300微米）聚氯乙烯（PVC）微塑料在紫外线和可见光照射下有机锡化合物（OTC）的释放动力学。发现在黑暗中浸出2至20μgg-PVC-1的24小时后，PVC颗粒中释放了四种OTC，即二甲基锡（DMT），单甲基锡（MMT），二丁基锡（DBT）和单丁基锡（MBT）。在紫外线/可见光照射下，仅DMT和DBT可检测到，而MMT和MBT由于快速的光降解而未检测到。在曝光下，水相中的总锡浓度（包括有机锡和无机锡）单调增加。相反，它们在黑暗中24小时后到达高原，证实了OTC的光降解。建立了释放动力学模型，并正确解释了微塑料尺寸对OTC释放过程的影响。最后，研究了盐度和溶解有机物（DOM）的影响。在高盐度条件下，OTC的释放和光降解均受到抑制，这可能是由于OTC在PVC微塑料上的再吸收增强以及卤素自由基对中性OTC的反应性降低所致。但是，DOM的存在增加了OTC的释放，这可能是因为激发态三重态DOM（（DOM）-D-3 *）形成并与来自PVC微塑料的OTC发生了反应。

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  • 来源
    《Environmental Science & Technology》 |2019年第18期|10741-10752|共12页
  • 作者

    Chen Chunzhao; Chen Ling; Yao Ying; Artigas Francisco; Huang Qinghui; Zhang Wen;

  • 作者单位

    Tongji Univ Coll Environm Sci & Engn Minist Educ Key Lab Yangtze River Water Environm Shanghai 200092 Peoples R China|Rutgers Univ Newark Meadowlands Environm Res Inst Dept Earth & Environm Sci Lyndhurst NJ 07071 USA;

    Shanghai Inst Pollut Control & Ecol Secur Shanghai 200092 Peoples R China|Tongji Univ Coll Environm Sci & Engn State Key Lab Pollut Control & Resource Reuse Shanghai 200092 Peoples R China;

    Rutgers Univ Newark Meadowlands Environm Res Inst Dept Earth & Environm Sci Lyndhurst NJ 07071 USA;

    Tongji Univ Coll Environm Sci & Engn Minist Educ Key Lab Yangtze River Water Environm Shanghai 200092 Peoples R China|Tongji Univ Coll Environm Sci & Engn State Key Lab Pollut Control & Resource Reuse Shanghai 200092 Peoples R China;

    New Jersey Inst Technol John A Reif Jr Dept Civil & Environm Engn Newark NJ 07102 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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