Study On The Determination And Degradation Of Environmental Hormones-Phthalic Acid Esters

Phthalic acid esters(PAEs) are the most commonly used plasticizer. Half of PAEs areenvironmental hormones, which have endocrine disruption character.PAEs in environmental water was deteceted by using HS-SPME and GC-MS. First,the operating conditions of SPME were determinted, including extraction temperature,extraction time and salting-out effect. The related testing conditions of GC-MS were tested,including temperature of injection port and desorption time. The concentration of internalstandard which is suitable for SPME-GC-MS was confirmed. The detection limits for DMP,DEP, DBP and DEHP are 0.939μg/L, 0.729μg/L, 0.317μg/L and 2.059μg/L respectively.Then the method was used to determine PAEs in water samples collected from watertreatment plants and tap water. The results show that the highest concentration of PAEs are:DMP 20.847μg/L, DEP 7.048μg/L, DBP 20.624μg/L, DEHP 2.377μg/L.By collecting environmental water samples and bottom sediment and simulating thenatural water body in the lab, the concentration changes of PAEs in water under differentacid-base concentration (pH=6, pH=7, pH=8) and different temperature degree (20℃,28℃) were studied. And the theoretical concentration changes were calculated accordingto the related environmental parameters of PAEs. The difference between the actualanalyzed data and theoretical calculated data were discussed. The main pollution behaviorof PAEs in water environment are microbial degradation, deposit's migration andtransformation and the main factors that affect PAEs'migration and transformation in waterare temperature and the pH. And the content change equations of PAEs in waterenvironment under normal temperature and neutral condition were preliminary fitted.