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The aim of this paper was to determine spatial variation of 6 indicator   polychlorinated biphenyls (PCBs) and 18 organochlorine pesticides (OCPs) in   street dust samples (n=49) collected during summer season from   suburban/urban zones of Tianjin, China. Sample preparation was performed by   using accelerated solvent extraction with simultaneous extraction and   clean-up of PCBs and OCPs, while quantification was carried out using gas   chromatography coupled with microelectro absorption detector and gas   chromatography coupled with mass spectrometry. The total concentrations of   studied PCBs varied from &lt;method limit of quantification (MLOQ) (0.028) to   6.38 ng/g (mean 0.72 ng/g and the median value of 0.028 ng/g), while the   total concentrations of studied OCPs varied from &lt;MLOQ (0.020) to 123 ng/g   (mean 33.6 ng/g and the median value of 25.9 ng/g). Regarding the OCPs   analyzed, dichlorodiphenyltrichloroethanes (DDTs),   beta-hexachlorocyclohexane (?-HCH), and ?-HCH were quantified, while all   indicator PCBs were quantified at least in one sample, with the exception of   PCB 180. Additional, principal component analysis was performed to evaluate   relationships between quantified compounds (PCBs, DDTs, and HCHs) and dust   characteristics. No correlation was found among quantified compounds and   dust characteristics with the exception of PCB 101 and PCB 138, which   correlates positively with pH and negatively with conductivity. The total   lifetime carcinogenic risk (TLCR) as well as total non-carcinogenic risk   hazard quotient (TnHQ) indicated that the risk to the human population   related to the presence of OCPs and PCBs in dust samples was acceptable.

Levels and risk assessment of selected persistent organic compounds in dust samples from Tianjin, China