DETERMINATIONS OF HEXABROMOCYCLODODECANE (HBCD) ISOMERS IN PLASTIC PRODUCTS FROM CHINA BY LC-MS/MS

摘要

HBCD is widely used brominated flame retardant, which is increasingly reported in the environment. In the study, the determinations of three HBCD isomers, alpha-, beta-, and gamma-HBCD in plastic products by LC-MS/MS method using respective labeled compounds as internal standard were developed. Plastic products included polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), and acryhnitrile butadiene styrene (ABS). Soxhlei extraction with n-hexane-isopropanol (1:1, v/v) was used, and extraction efficiency was confirmed to be satisfying by analyzing bromine by using XRF before and after extraction. Moreover, LC and MS/MS conditions were optimized. The limits of quantitation of 0.01, 0.005, and 0.005 mgkg~(-1) were calculated for three HBCD isomers, respectively. Using the established methods, HBCD emerged in two PS products of 15 commercially available plastic products in China. A higher proportion of alpha-HBCD in two PS products was compared with that of commercial HBCD mixtures, indicating that gamma-HBCD possibly isomerized to alpha-HBCD by heating processes to incorporate the commercial formulation into plastic products.