Li Rongrong, Ren Kefan, Su Huijun, Wei Yu, Su Guanyong
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.
Sci Total Environ. 2023 Jan 1;854:158408. doi: 10.1016/j.scitotenv.2022.158408. Epub 2022 Sep 1.
Recent studies have reported the occurrence of liquid crystal monomers (LCMs) in sediment, indoor dust, hand wipes, and human serum samples; however, information regarding their contamination status in soil is currently unavailable. The concentrations of 39 target LCMs were determined in n = 96 surface soil samples collected from five different urban functional zones including agricultural, scenic, industrial, commercial, and residential zones. We observed that 76 of 96 surface soil samples contained at least 19, 13, 16, 19, and 14 of the 39 target LCMs that were detectable in samples from agricultural, scenic, industrial, commercial, and residential zones, respectively. The LCMs in the samples from the agricultural zone exhibited the highest mean concentrations of 12.9 ng/g dry weight (dw), followed by those from commercial (5.23 ng/g dw), residential (3.30 ng/g dw), industrial (2.48 ng/g dw), and scenic zones (0.774 ng/g dw). Furthermore, strong and statistically significant (p < 0.05) correlations were observed for several pairs of LCMs (3cH2B vs. 5bcHdFB in the agricultural zone; 5bcHdFB vs. 2bcHdFB, 5bcHdFB vs. 3cH2B in the commercial zone; 5bcHdFB vs. 2bcHdFB in the industrial zone), indicating that they might have similar commercial applications and sources. Based on a newly established database containing 1173 LCMs, suspect screening was applied to discover other LCMs in these 96 soil samples using gas chromatograph coupled with quadrupole-time-of-flight mass spectrometry (GC-QTOF/MS). We tentatively identified 51 LCM formulas with 69 chemical structures. Collectively, this study provides the first evidence for the occurrence of LCMs in soil samples, and suggests that LCMs could be widely distributed across all five urban functional zones.
最近的研究报告了在沉积物、室内灰尘、手巾擦拭样本和人体血清样本中发现了液晶单体（LCMs）；然而，目前尚无关于它们在土壤中污染状况的信息。测定了从农业、景区、工业、商业和居民区五个不同城市功能区采集的n = 96份表层土壤样本中39种目标LCMs的浓度。我们观察到，96份表层土壤样本中分别有76份至少含有在农业、景区、工业、商业和居民区样本中可检测到的39种目标LCMs中的19种、13种、16种、19种和14种。农业区样本中的LCMs平均浓度最高，为12.9 ng/g干重（dw），其次是商业区（5.23 ng/g dw）、居民区（3.30 ng/g dw）、工业区（2.48 ng/g dw）和景区（0.774 ng/g dw）。此外，还观察到几对LCMs之间存在强且具有统计学意义（p < 0.05）的相关性（农业区中3cH2B与5bcHdFB；商业区中5bcHdFB与2bcHdFB、5bcHdFB与3cH2B；工业区中5bcHdFB与2bcHdFB），这表明它们可能具有相似的商业用途和来源。基于一个新建立的包含1173种LCMs的数据库，利用气相色谱-四极杆-飞行时间质谱联用仪（GC-QTOF/MS）对这96份土壤样本进行可疑物筛查，以发现其他LCMs。我们初步鉴定出51个LCM分子式和69种化学结构。总体而言，本研究首次提供了土壤样本中存在LCMs的证据，并表明LCMs可能广泛分布于所有五个城市功能区。
