颗粒物中苯并噻唑及其衍生物的污染特征及暴露评价

在城市内选取包括城市背景空气、市区以小型客车为主的路边和大量大型货车通行的3个路边采样点进行了空气中PM_2.5和PM₁₀的采集，建立了利用超高效液相色谱串联三重四级杆质谱仪（UPLC-MS/MS）对颗粒物中苯并噻唑及其5种衍生物（BT、2-NH₂-BT、2-OH-BT、MBT、MTBT）的检测方法，并对其污染特征及暴露风险进行了分析.结果显示，3点位PM_2.5和PM₁₀样品中均为BT的浓度最高，占总浓度的44.4%~55.2%；各化合物浓度呈路边环境高于城市背景环境，表明高制动频率导致路边空气中含有较多的轮胎磨损颗粒物；除2-NH₂-BT外，其它4种BTs化合物与PM_2.5和PM₁₀的浓度之间具有较好的线性关系，表明二者具有相同的来源；各化合物在PM_2.5和PM₁₀中浓度的比值（PM_2.5/PM₁₀）范围为0.41~0.95，说明BTs更易于富集在较细颗粒物中或轮胎磨损排放的细颗粒较多.暴露评价结果显示，路边工作者对BTs的日呼吸暴露量大于其他人，可能具有更高的健康风险其中BT的贡献量最大.

Pollution characteristics and exposure assessment of benzothiazole and its derivatives in ambient air particulates

A sampling program was conducted to determine the levels of benzothiazole and its five derivatives (BTs, including BT、2-NH₂-BT、2-OH-BT、MBT、MTBT) in PM_2.5 and PM₁₀ using UPLC-triple quadrupole MS. Three sampling points located at urban background and roadsides were selected. Pollution characteristics and exposure risks of target compounds were evaluated. The concentration of BT in PM_2.5 and PM₁₀ samples was the highest at all three points, accounting for 44.4%~55.2% of the total concentration. Concentration of BTs tended to be the highest at the roadside with high braking frequency, indicating that high braking frequency resulted in more tire wear particles in roadside air. There were good linear relationships between the concentration of BTs (except 2-NH₂-BT) in PM_2.5 and PM₁₀, which indicates that PM_2.5 and PM₁₀ of roadside air have the same source. The ratio of the concentration of BTs in PM_2.5 and PM₁₀(PM_2.5/PM₁₀) ranged from 0.41 to 0.95, indicating that BTs are more easily concentrated in fine particles or fine particles are the main fraction of tire wear emission. The results of exposure assessment showed that the daily inhalation exposure dose of roadside workers to BTs was greater than other people, which may cause a higher health risk. BT contributed the most to inhalation exposure dose among five compounds.