Characteristics Of Organophosphate Ester And Mercury In Atmosphere Of Xinxiang And Gas-particle Partitioning Behavior

Atmospheric particulates,because of its large surface area and readily to enrich toxic heavy metals and organic pollutants,posed a great threat to human health.Atmospheric environment samples were collected in Xinxiang city during 2015.The emerging organic pollutants-organophosphate and another typical pollutant-mercury was detected to analyse pollution characteristics,its relationship between pollution concentration and meteorological conditions?temperature,etc??carbon component?EC?OC??and gaseous pollutants?NO₂?SO₂,etc.?.Besides,the health risks of OPEs in the atmospheric environment of Xinxiang were analyzed,the sources of pollution were analyzed.The results of the study were as follows:1.The annual average concentration of?OPEs in atmosphere was 389 pg/m3,ranged from 24.2pg/m3-3549 pg/m3.TMCP and TPCP accounted for 83%of the amount of?OPEs,which were the main pollutants in the atmospheric environment of Xinxiang.The level of OPEs pollution in the atmospheric environment of Xinxiang was higher than that in the outskirts and more remote areas,which was lower than the more developed areas and the level of OPEs was in the middle level of pollution.The results of principal component analysis showed that the main sources of OPEs in Xinxiang were industrial emission sources and scattered sources.2.The sedimentation flux in head airways?15.2 pg/h?>alveolar region?3.92 pg/h?>tracheobronchial region?0.414 pg/h?,the sedimentation flux of OPEs in the alveoli accounted for 20.2%of the total respiratory flux In PM_2.5.The risk of exposure to OPEs exposure by inhalation was at a lower level,and the risk of children's exposure to OPEs in Xinxiang was greater than that of adults.3.In the atmospheric environment,OPEs mainly existed in the form of gaseous.The correlation between OPEs air-particle partition coefficient and temperature was not significant.Relative humidity had a significant effect with TPCP,but it did not show significant correlation with other OPEs monomer.The correlation coefficient of langmuir equation fitted by experimental data was better than that of Freundlich equation,indicating that the distribution behavior of these OPEs between gas phase and particle phase was more consistent with langmuir single molecule absorption model.4.The annual average concentration of mercury in PM _2.5.5 in Xinxiang was 0.0896?g/g,and the average annual volume concentration was 0.399 ng/m³.The concentration of mercury in PM_2.5 was much lower than First order concentration limit of ambient air mercury,but this value were 98%days of the whole year exceed the global background value.Compared with other cities at home and abroad,the level of mercury pollution of PM _2.5 in Xinxiang was at a relatively high level.In 2015,the mass and volume concentration of mercury in the heating period PM_2.5 was higher than that in the non-heating period.The measures such as the single and double number restriction and the shutdown of polluting factories adopted during the Shanghai Cooperation Conference effectively contained mercury in PM_2.5.In addition,the higher atmospheric mixing layer height and higher wind speed during the Shanghai Cooperation Conference were more conducive to the diffusion of pollutants.The discharge of fireworks caused a dramatic increase in the concentration of mercury in PM _2.5.5.The mass concentration and volume concentration of mercury in PM_2.5 were negatively correlated with temperature and humidity.However,it was not correlated with daily mean wind speed.Which showed that the distribution of mercury pollution were relatively uniform in Xinxiang,and the source of mercury pollution were not the long-distance air transportation,but the local source.The mass concentration and volume concentration of mercury in PM_2.5 showed a significant positive correlation with the EC and OC of PM_2.5,indicating that the transformation of mercury from gaseous mercury to PM_2.5 was affected by the adsorption and enrichment of carbon components.The mass concentration and volume concentration of mercury in PM_2.5.5 had no obvious correlation with PM_2.5,indicating that mercury had a different source with PM_2.5.The mass concentration and volume concentration of mercury had a significant negative correlation with the concentration of O₃.Because the source of mercury in PM_2.5.5 was related to incomplete combustion,the mass concentration and volume concentration of mercury in PM_2.5.5 had a significant positive correlation with the concentration of CO.