MOE Key Laboratory of Pollution Processes and Environmental Criteria, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China.
MOE Key Laboratory of Pollution Processes and Environmental Criteria, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China.
Environ Int. 2022 Jun;164:107295. doi: 10.1016/j.envint.2022.107295. Epub 2022 May 11.
Liquid crystal monomers (LCMs) are a class of emerging, persistent, bioaccumulative, and toxic organic pollutants. They are detected in various environmental matrixes that are associated with electronic waste (e-waste) dismantling. However, their occurrence and distribution in indoor and outdoor dust on a national scale remain unknown. In this study, a dedicated target analysis quantified a broad range of 60 LCMs in dust samples collected across China. The LCMs were frequently detected in indoor (n = 48) and outdoor dust (n = 97; 37 sampled concomitantly with indoors dust) from dwellings, and indoor dust from cybercafés (n = 34) and phone repair stores (n = 22), with median concentrations of 41.6, 94.7, 106, and 171 ng/g, respectively. No significant spatial difference was observed for the concentrations of the total LCMs among distinct geographical regions (p > 0.05). The median daily intake values of the total LCMs via dust ingestion, dermal contact, and inhalation were estimated at 1.50 × 10, 2.90 × 10, and 8.57 × 10 ng/kg BW/day for adults and 1.47 × 10, 1.22 × 10, and 2.18 × 10 ng/kg BW/day for children, respectively. These estimates suggested higher exposure risks for children and indicated that dust ingestion and dermal contact significantly contribute to the human intake of LCMs. The microenvironmental pollution levels of LCMs together with the potential exposure risks associated with some of these chemicals are of concern for human health.
液晶单体（LCMs）是一类新兴的、持久性的、生物累积性的和有毒的有机污染物。它们在与电子废物（e-waste）拆解有关的各种环境基质中被检测到。然而，它们在全国范围内的室内和室外灰尘中的存在和分布情况仍然未知。在这项研究中，一项专门的目标分析定量测定了在中国各地采集的灰尘样本中广泛存在的 60 种 LCMs。在住宅中的室内（n=48）和室外灰尘（n=97；37 个样本与室内灰尘同时采集）以及网吧（n=34）和手机维修店（n=22）的室内灰尘中，LCMs 经常被检测到，中位数浓度分别为 41.6、94.7、106 和 171ng/g。不同地理区域之间的总 LCMs 浓度没有明显的空间差异（p>0.05）。通过灰尘摄入、皮肤接触和吸入途径摄入总 LCMs 的日均摄入量值分别为成人 1.50×10、2.90×10 和 8.57×10ng/kg BW/day，儿童 1.47×10、1.22×10 和 2.18×10ng/kg BW/day。这些估计值表明儿童面临更高的暴露风险，并表明灰尘摄入和皮肤接触对人体摄入 LCMs 有显著贡献。LCMs 的微环境污染水平以及其中一些化学物质所带来的潜在暴露风险，都值得关注人类健康。
