优化的海洋沉积物中微塑料提取与鉴定方法。
An optimized procedure for extraction and identification of microplastics in marine sediment.
机构信息
Key Laboratory of Marine Chemistry Theory and Technology (Ocean University of China), Ministry of Education, Qingdao 266100, China.
Key Laboratory of Marine Chemistry Theory and Technology (Ocean University of China), Ministry of Education, Qingdao 266100, China; Marine Bioresource and Environment Research Center, Key Laboratory of Marine Ecological Environment Science and Technology, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China.
出版信息
Mar Pollut Bull. 2021 Apr;165:112130. doi: 10.1016/j.marpolbul.2021.112130. Epub 2021 Feb 11.
Microplastics (MPs) in sediment environments have been widely reported. As the number of samples increases, establishing a reliable and effective method becomes increasingly urgent for the rapid extraction and identification of MPs in sediments. Herein, we proposed a system with continuous density flotation of NaBr-ZnCl (mixture of NaBr and ZnCl) solution for extracting MPs in a sediment sample, combined with micro-Fourier transform infrared (μ-FT-IR) imaging scanning for identification of MPs. The recoveries of MPs were estimated for four different sizes, shapes, and ten different types of polymers. The results indicated NaBr-ZnCl solution showed a high recovery rate from 88.33% to 100.00% for extracting these different MPs. The μ-FT-IR imaging scanning allows for the detection of plastic down to the size of 6.25 μm in filed samples, and merely takes about 3 min, which was validated by testing of sediments from Jiaozhou Bay, China and its adjacent estuaries.
沉积物环境中的微塑料（MPs）已被广泛报道。随着样品数量的增加，建立一种可靠有效的方法对于快速提取和识别沉积物中的 MPs 变得越来越紧迫。在此，我们提出了一种使用 NaBr-ZnCl（NaBr 和 ZnCl 的混合物）溶液连续密度浮选的系统，用于提取沉积物样品中的 MPs，同时结合微傅里叶变换红外（μ-FT-IR）成像扫描来识别 MPs。我们对四种不同尺寸、形状和十种不同类型的聚合物的 MPs 回收率进行了估计。结果表明，NaBr-ZnCl 溶液对不同 MPs 的提取回收率高达 88.33%至 100.00%。μ-FT-IR 成像扫描可检测到实地样品中尺寸小至 6.25 μm 的塑料，仅需约 3 分钟，这通过对中国胶州湾及其邻近河口的沉积物的测试得到了验证。
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