School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China.
Environ Sci Technol. 2021 Feb 16;55(4):2336-2345. doi: 10.1021/acs.est.0c06427. Epub 2021 Feb 2.
Liquid crystal monomers (LCMs) have been proposed to be persistent, bioaccumulative, and toxic (PBT) substances; however, there is a dearth of information regarding their occurrence in sediment samples. Here, an analytical method was developed for the quantitative determination of LCMs in sediment samples, and = 76 sediment samples were collected and analyzed to determine accurate concentrations of LCMs. Our results indicated that the developed pretreatment procedure was applicable for the determination of LCM concentrations in sediments. We observed that LCMs were detected in 75 out of the 76 sediment samples, and 23, 18, and 14 out of the 39 target LCMs were quantified in at least one of the analyzed sediments from rivers around LCM or liquid crystal device (LCD) manufacturers, Taihu Lake, and rivers around e-waste recycling sites, respectively. The LCMs in the samples from rivers around LCM/LCD manufacturers exhibited the greatest mean concentrations of 26.1 ng/g dry weight (dw), followed by those from e-waste recycling site areas (1.15 ng/g dw) and Taihu Lake (0.076 ng/g dw). Collectively, this study provided the first analytical method that was able to quantify the concentrations of LCMs in sediment samples and provided the first evidence for the occurrence of LCMs in sediment samples.
液晶单体 (LCMs) 被认为是持久性、生物累积性和毒性 (PBT) 物质；然而，关于它们在沉积物样品中的存在的信息却很少。在这里，开发了一种用于定量测定沉积物样品中 LCMs 的分析方法，并采集了 76 个沉积物样品进行分析，以确定 LCMs 的准确浓度。我们的结果表明，所开发的预处理程序适用于沉积物中 LCM 浓度的测定。我们观察到，在 76 个沉积物样品中有 75 个检测到了 LCMs，在来自液晶制造商或液晶显示器 (LCD) 制造商附近河流、太湖以及电子废物回收场附近河流的分析沉积物中，有 23、18 和 14 种目标 LCMs 至少在一种沉积物中被定量。来自液晶/LCD 制造商附近河流的样品中的 LCMs 表现出最大的平均浓度 26.1ng/g 干重 (dw)，其次是来自电子废物回收场地区 (1.15ng/g dw) 和太湖 (0.076ng/g dw)。总的来说，本研究提供了第一个能够定量测定沉积物样品中 LCMs 浓度的分析方法，并提供了第一个关于 LCMs 在沉积物样品中存在的证据。
