Identification of Chain Scission Products Released to Water by Plastic Exposed to Ultraviolet Light,Environmental Science & Technology Letters

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Identification of Chain Scission Products Released to Water by Plastic Exposed to Ultraviolet Light
Environmental Science & Technology Letters ( IF 8.9 ) Pub Date : 2018-04-04 00:00:00 , DOI: 10.1021/acs.estlett.8b00119
Berit Gewert ₁ , Merle Plassmann ₁ , Oskar Sandblom ₁ , Matthew MacLeod ₁

Affiliation

Buoyant plastic in the marine environment is exposed to sunlight, oxidants, and physical stress, which may lead to degradation of the plastic polymer and the release of compounds that are potentially hazardous. We report the development of a laboratory protocol that simulates the exposure of plastic floating in the marine environment to ultraviolet light (UV) and nontarget analysis to identify degradation products of plastic polymers in water. Plastic pellets [polyethylene, polypropylene, polystyrene, and poly(ethylene terephthalate)] suspended in water were exposed to a UV light source for 5 days. Organic chemicals in the water were concentrated by solid phase extraction and then analyzed by ultra-high-performance liquid chromatography coupled to high-resolution mass spectrometry using a nontarget approach with a C18 LC column coupled to a Q Exactive Orbitrap HF mass spectrometer. We designed a data analysis scheme to identify chemicals that are likely chain scission products from degradation of the plastic polymers. For all four polymers, we found homologous series of low-molecular weight polymer fragments with oxidized end groups. In total, we tentatively identified 22 degradation products, which are mainly dicarboxylic acids.

中文翻译：

暴露在紫外线下的塑料释放到水中的断链产物的鉴定

海洋环境中的漂浮性塑料暴露于阳光，氧化剂和物理应力下，这可能导致塑料聚合物降解并释放出潜在危险的化合物。我们报告了实验室协议的发展，该协议可模拟海洋环境中漂浮的塑料对紫外线（UV）的暴露和非目标分析，以识别水中塑料聚合物的降解产物。将悬浮在水中的塑料颗粒[聚乙烯，聚丙烯，聚苯乙烯和聚对苯二甲酸乙二醇酯]暴露于紫外线光源5天。水中的有机化学物质通过固相萃取进行浓缩，然后使用结合了Q Exactive Orbitrap HF质谱仪的C18 LC色谱柱的非目标方法，通过超高效液相色谱仪和高分辨率质谱法进行分析。我们设计了一种数据分析方案，以识别可能是塑料聚合物降解引起的断链产物的化学物质。对于所有四种聚合物，我们发现了具有氧化端基的低分子量聚合物片段的同源序列。我们初步确定了22种降解产物，主要是二羧酸。我们发现了具有氧化端基的低分子量聚合物片段的同源序列。我们初步确定了22种降解产物，主要是二羧酸。我们发现了具有氧化端基的低分子量聚合物片段的同源序列。我们初步确定了22种降解产物，主要是二羧酸。

更新日期：2018-04-04

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