模拟海洋环境条件下磷酸三(2-氯丙基)酯自然衰减的动力学与机理研究OA

Organophosphate flame retardants are widely present in marine environments due to their large usage and easy release tendency.Among them,tris(2-chloropropyl)phosphate(TCPP)is the most abundant chlorinated organophosphate flame retardants in seawater,and its environmental behav-ior and ecological risks have aroused a growing concern.Under simulated marine environmental condi-tions,the kinetics and mechanism of TCPP natural attenuation in seawater were studied,and the bio-toxicity of degradation products was evaluated.The natural removal efficiency of 100 μg/L TCPP within 90 days was only 24.90%,with a half-life of 231.05 days,and the attenuation process conformed to the first-order reaction kinetics equation.Among various attenuation pathways,photolysis contributed the most to the removal of TCPP,followed by biodegradation and hydrolysis,respectively.Two intermedi-ates bis(2-chloropropyl)phosphate and mono(2-chloropropyl)phosphate,were identified through high-resolution mass spectrometry analysis.In addition,an increase in phosphate concentration and a de-crease in pH were observed in seawater samples.It is speculated that TCPP attenuation mainly occurs via dechloroalkylation reaction.The lower acute/chronic toxicity of intermediates than the parent com-pound and the formation of a small amount of phosphate indicate that the adverse impact of TCPP natu-ral attenuation on marine ecosystem is relatively low.This study provides a scientific basis for a deeper understanding of the environmental behavior of TCPP in seawater and its ecological risk assessment.