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Comprehensive Identification of Liquid Crystal Monomers—Biphenyls, Cyanobiphenyls, Fluorinated Biphenyls, and their Analogues—in Waste LCD Panels and the First Estimate of their Global Release into the Environment
Environmental Science & Technology ( IF 11.4 ) Pub Date : 2021-09-10 , DOI: 10.1021/acs.est.1c03901
Xinxin Liang 1 , Ruiman Xie 1 , Chunyou Zhu 1 , Hui Chen 1 , Mingjie Shen 1 , Quan Li 1 , Bibai Du 1 , Dan Luo 1 , Lixi Zeng 1
Affiliation  

Our previous study demonstrated massive emissions of liquid crystal monomers (LCMs) from liquid crystal display (LCD)-associated e-waste dismantling; however, the compositions, priority list, and inventory of LCMs in waste LCD panels remain unknown. Herein, we conducted the first comprehensive identification covering a broader range of LCMs, including 21 biphenyls and analogues (BAs), 28 cyanobiphenyls and analogues (CBAs), and 44 fluorinated biphenyls and analogues (FBAs), in waste television/computer LCD panels. A total of 64 of the 93 target LCMs, including 19 BAs, 6 CBAs, and 39 FBAs, were widely detected in collected waste LCD panels. Approximately 10–18 of the 64 detectable LCMs were identified as the main compositions in various waste LCD panels, which contributed to >90% of the total LCMs. Total concentrations of FBAs in the television/computer LCD panel samples were comparable to those of BAs but much higher than those of CBAs, indicating FBAs and BAs being the commonly used LCM categories. The composition distribution of LCMs varied between television/computer LCDs and among different brands of television/computer LCDs. A preliminary estimate of the globally direct release of LCMs from waste television/computer LCD panels into various environmental compartments was about 1.07–107 kg/year, which will increase considerably in the near future.

中文翻译:

综合鉴定废 LCD 面板中的液晶单体 - 联苯、氰基联苯、氟化联苯及其类似物,并初步估计其全球排放到环境中

我们之前的研究表明,与液晶显示器 (LCD) 相关的电子废物拆解会排放大量液晶单体 (LCM);然而,废弃 LCD 面板中 LCM 的成分、优先级列表和库存仍然未知。在此,我们首次对废电视/计算机 LCD 面板中更广泛的 LCM 进行了全面鉴定,包括 21 种联苯和类似物 (BA)、28 种氰基联苯和类似物 (CBA) 以及 44 种氟化联苯和类似物 (FBA)。在收集的废弃液晶面板中,共检测到 93 个目标 LCM 中的 64 个,包括 19 个 BA、6 个 CBA 和 39 个 FBA。在 64 个可检测的 LCM 中,大约有 10-18 个被确定为各种废弃 LCD 面板中的主要成分,占总 LCM 的 90% 以上。电视/计算机 LCD 面板样品中 FBA 的总浓度与 BA 相当,但远高于 CBA,表明 FBA 和 BA 是常用的 LCM 类别。LCM 的组成分布在电视/电脑 LCD 之间以及不同品牌的电视/电脑 LCD 之间有所不同。全球范围内从废弃电视/计算机 LCD 面板中直接释放到各种环境隔间中的 LCM 的初步估计约为 1.07-107 千克/年,在不久的将来会显着增加。
更新日期:2021-09-21
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