Dietary intake is one of the main pathways for residents to become exposed to chlorinated paraffins (CPs). In China, due to the popularization of nutritional and medicinal edible fungi, consumption has increased on a yearly basis. Edible fungi have a variety of active substances and are consumed daily by residents.However, there is limited information on the concentration and source of chlorinated paraffins in edible fungi. In this study, the concentrations of short-chain chlorinated paraffins (SCCPs) and medium-chain chlorinated paraffins (MCCPs) in 105 edible fungi samples and 36 culture material samples were detected. The concentration range of SCCPs was 79.8 ng/g dw to 3879.3 ng/g dw, and the MCCPs was ND to 572.3 ng/g dw. Spearman correlation analysis indicated that the sources of SCCPs and MCCPs in edible fungi were similar (r = 0.57, p < 0.01).The preponderant SCCPs and MCCPs congener group profiles were C 10 Cl 7-8 and C 14 Cl 6-8 . CPs were detected in culture materials, the concentration range of SCCPs was 320.2 ng/g dw to 4326 ng/g dw, and the MCCPs was 333.4 ng/g dw to 4517.4 ng/g dw. And the preponderant SCCPs and MCCPs homologues in culture materials were C 11-12 Cl 6 and C 14 Cl 6 . The linear discriminant analysis results indicated different contamination models of CPs between edible fungi and culture materials. The mean estimated daily intake values of SCCPs and MCCPs were 308.1 ng/kg bw/d and 94.4 ng/kg bw/d, respectively, indicating no potential health risk posed by CP exposure in edible fungi.

Water resources play an important role in industrial, agricultural, and public activities. Chlorinated paraffins (CPs) in wastewater generated by these activities provide an important source of CP contamination. In this study, the occurrences of short-chain chlorinated paraffins (SCCPs) and medium-chain chlorinated paraffins (MCCPs) were simultaneously studied in a typical sewage treatment plant (STP) near China’s second-largest oil production base over a 1-year period. High levels of SCCPs and MCCPs (3809 ± 670 and 4803 ± 478 ng/L) were found in the influent due to receiving 75% of industrial wastewater. C14-CPs was the predominant congener group, accounting for 37% of the total CP concentrations. The dissolved removal efficiency of CPs was 83.5%. Mass balance results demonstrated that 3.2% of the initial CPs was found in the final effluent, and 66.3% of the initial CPs was found in the dehydrated sludge, while 30.4% of the initial CPs was lost due to the biodegradation and volatilization. This indicated that sorption onto sludge was the main fate of CPs in wastewater treatment. High mass fractions of CPs were found in the final effluent and dewatered sludge in the winter season due to the low biodegradation, biotransformation, and volatilization.