Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing, 210094, PR China.
Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing, 210094, PR China.
Environ Pollut. 2024 Sep 1;356:124285. doi: 10.1016/j.envpol.2024.124285. Epub 2024 May 30.
Liquid crystal monomers (LCMs), which are commonly used in electronic device screens, have attracted attention as a potential class of emerging organic pollutants with persistent, bioaccumulative, and toxic (PBT) properties. This study involved the collection of 54 surface soil samples around one LC industrial park at increasing spatial distances within 1 km, 1-3 km, and 3-5 km from the center of the LC industrial park. Our observations revealed the presence of LCMs in 46 of 54 surface soil samples examined. Of the 39 target LCMs, 36 were identified, comprising 14 non-fluorinated and 22 fluorinated LCMs. Nine LCMs were detected at frequencies exceeding 20%, with 3bcHdFB exhibiting the highest detection frequency of 59% in the soil samples. The total LCM concentrations across the 46 sampling locations varied from 0.0072 to 17.24 ng/g dw, with the highest total concentrations at sampling sites within 1 km of the liquid crystal plant, suggesting that manufacturing processes may be a potential source for LCM release into the environment. Differences were observed in the LCM contamination patterns among the three sampling areas. Additionally, we observed a decrease in the median LCM concentration with increasing distance from the center of the LC industrial park. However, no statistically significant differences (p > 0.05) in LCM concentrations were observed across the three distances assessed in this study. This may be owing to the limited variety of target compounds analyzed and the limited number of soil samples. Our results emphasize that further studies on the emissions and pollution characteristics of LCMs during production are warranted.
液晶单体（LCMs）常用于电子设备屏幕，作为一类具有持久性、生物累积性和毒性（PBT）特性的新兴有机污染物备受关注。本研究采集了距离液晶工业园中心 1km、1-3km 和 3-5km 范围内的 54 个表层土壤样品。结果表明，在所采集的 54 个表层土壤样品中，有 46 个样品中检测到 LCMs。在所检测的 39 种目标 LCMs 中，有 36 种被鉴定出来，包括 14 种非氟化 LCMs 和 22 种氟化 LCMs。9 种 LCMs 的检出频率超过 20%，其中 3bcHdFB 在土壤样品中的检出频率最高，为 59%。46 个采样点的总 LCM 浓度在 0.0072 至 17.24ng/g dw 之间变化，距离液晶工厂 1km 以内的采样点总浓度最高，表明制造过程可能是 LCM 向环境释放的潜在来源。三个采样区的 LCM 污染模式存在差异。此外，随着距离液晶工业园中心的距离增加，LCM 浓度的中位数呈下降趋势。然而，在所研究的三个距离范围内，LCM 浓度没有表现出统计学上的显著差异（p＞0.05）。这可能是由于分析的目标化合物种类有限，土壤样本数量有限。我们的研究结果强调，有必要进一步研究生产过程中 LCMs 的排放和污染特征。
