Flame retardants (FRs) from electronic waste (e-waste) are a widespread environmental concern. In our study, in vitro physiologically based extraction tests (PBETs) for FRs were conducted in three different areas where dust remained after processing of e-waste to identify the bioaccessible FRs and quantify their bioaccessibilities of gastrointestinal tract for human as well as to assess the exposure via ingestion of workers in e-waste processing workshops. All 36 FRs were measured and detected in indoor dusts. Among the FRs, the mean concentrations of polybrominated diphenyl ethers (PBDEs) in the floor dust and settled dust were highest, 65,000 ng/g, and 31,000 ng/g, respectively. In contrast, phosphorus-containing flame retardants (PFRs) presented the highest mean concentration in the workplace dust samples, 64,000 ng/g. However, the highest bioaccessible concentrations in workplace dust, floor dust, and settled dust were observed for PFRs: 5900, 1600, and 680 ng/g, respectively. This study revealed that the higher bioaccessibility of PFRs versus other compounds was related to the negative correlation between FR concentrations and log KOW (hydrophobicity) values. The fact that hazard indices calculated using measured bioaccessibilities were less than 1 suggested that the non-cancer risk to human health by the FRs exposure via dust ingestion might be low.

中文翻译：

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越南北部电子废物加工车间的工人通过吸入粉尘获取阻燃剂的生物可及性和接触评估。

电子废物（电子废物）中的阻燃剂（FRs）引起了广泛的环境关注。在我们的研究中，在三个不同的电子废物处理后残留粉尘的区域进行了FRs的体外生理基础提取试验（PBET），以识别生物可利用的FRs并量化其对人体胃肠道的生物可利用性，并评估通过在电子废物处理车间吞食工人进行暴露。在室内灰尘中测量并检测了全部36种阻燃剂。在阻燃剂中，地板粉尘和沉降粉尘中的多溴二苯醚（PBDEs）的平均浓度最高，分别为65,000 ng / g和31,000 ng / g。相反，含磷阻燃剂（PFR）在工作场所粉尘样品中的平均浓度最高，为64,000 ng / g。然而，对于PFR，观察到的工作场所粉尘，地板粉尘和沉降粉尘中可生物利用的最高浓度分别为5900、1600和680 ng / g。这项研究表明，PFR与其他化合物相比具有更高的生物可及性，与FR浓度和log KOW（疏水性）值之间呈负相关。使用测得的生物可及性计算出的危害指数小于1的事实表明，通过摄入粉尘摄入FRs对人类健康的非癌症风险可能较低。