液晶单体(LCM)是新兴的有机污染物,由于其潜在的持久性,毒性,和生物蓄积性。这项研究首先表征了珠江口(PRE)生物中19种LCM的水平和组成,估计了它们的生物累积和营养转移潜力,并确定了优先污染物。LCM通常积累在沉积物中的生物中,所有生物体中的LCM浓度范围为32.35至1367ng/g脂质重量。生物中主要的LCM是联苯和类似物(BA)(76.6%),其次是氰基联苯和类似物(CBA)(15.1%),最少的是氟化联苯和类似物(FBA)(11.2%)。BAs中最丰富的LCM单体,FBA,生物中LCM中的CBA是1-(4-丙基环己基)-4-乙烯基环己烷(15.1%),1-乙氧基-2,3-二氟-4-(4-(4-丙基环己基)环己基)苯(EDPBB,10.1%),和4'-丙氧基-4-联苯甲腈(5.1%),分别。生态位研究表明,PRE食物网由陆生饮食和海洋食物链组成。大多数LCM在陆地饮食和海洋食物链中表现出生物稀释,除了EDPBB和4,4'-双(4-丙基环己基)联苯(BPCHB)。疏水性,LCM的氟取代位置,生物习性可能是影响LCMs生物富集和营养转移的重要因素。1-(丙-1-烯基)-4-(4-丙基环己基)环己烷,和EDPBB被表征为优先污染物。本研究首次报道了LCM的营养转移过程和机制以及PRE中的生物监测。
Liquid crystal monomers (LCMs) are emerging organic pollutants due to their potential persistence, toxicity, and bioaccumulation. This study first characterized the levels and compositions of 19 LCMs in organisms in the Pearl River Estuary (PRE), estimated their bioaccumulation and trophic transfer potential, and identified priority contaminants. LCMs were generally accumulated in organisms from sediment, and the LCM concentrations in all organisms ranged from 32.35 to 1367 ng/g lipid weight. The main LCMs in organisms were biphenyls and analogues (BAs) (76.6%), followed by cyanobiphenyls and analogues (CBAs) (15.1%), and the least were fluorinated biphenyls and analogues (FBAs) (11.2%). The most abundant LCM monomers of BAs, FBAs, and CBAs in LCMs in organisms were 1-(4-propylcyclohexyl)-4-vinylcyclohexane (15.1%), 1-ethoxy-2,3-difluoro-4-(4-(4-propylcyclohexyl) cyclohexyl) benzene (EDPBB, 10.1%), and 4\'-propoxy-4-biphenylcarbonitrile (5.1%), respectively. The niche studies indicated that the PRE food web was composed of terrestrial-based diet and marine food chains. Most LCMs exhibited biodilution in the terrestrial-based diet and marine food chains, except for EDPBB and 4,4\'-bis(4-propylcyclohexyl) biphenyl (BPCHB). The hydrophobicity, position of fluorine substitution of LCMs, and biological habits may be important factors affecting the bioaccumulation and trophic transfer of LCMs. BPCHB, 1-(prop-1-enyl)-4-(4-propylcyclohexyl) cyclohexane, and EDPBB were characterized as priority contaminants. This study first reports the trophic transfer processes and mechanisms of LCMs and the biomonitoring in PRE.