| Volatile Organic Compounds（VOCs）are the common precursors in the formation of photochenmical of O3 and secondary organic aerosol（SOA）,which have become the focus of national control and prevention,and anthropogenic emissions are an important source of VOCs.At present,the domestic anthropogenic emission inventories mainly involve industrial sources,transportation,solvent use sources,etc..China’s industrial solvent source emission inventory is relatively perfect,but the domestic solvent source emission inventory represented by daily chemical products is still blank.This is mainly due to its small emissions in the past,coupled with its characteristics of non-organized evaporation and difficulty in collecting activity data so its emission inventory research is less,but studies have shown that the emissions of domestic solvent sources are increasing year by year,and the contribution on ozone generation cannot be ignored.It can be seen that it is necessary to improve the VOCs emission inventory of daily chemical products in China,which has important practical significance.It can provide scientific reference for the formulation of VOCs control policies of daily chemical products and provide scientific support for the effective formulation of O3 and PM2.5pollution coordinated control measures.Therefore,this study takes VOCs from daily chemical products as the research object to explore its emissions,species composition,generation potential and historical evolution and contribution to ozone.Taking 2018 as the base year,the VCPy framework was used to estimate the VOCs emission of daily chemical products,the national VOCs emission inventory of daily chemical products from 2006 to 2018 was compiled,and the refined VOCs emission inventory of source active VOCs of daily chemical products was established based on chemical reactivity.On this basis,the generation potential of O3 and SOA was estimated,the key control species and sources of VOCs in daily chemical products were identified,Based on this inventory and the meteorological field simulated by WRF model.Multi-scale air quality model CMAQ was used to quantify its contribution to ozone.The results of this study are as follows:（1）In 2018,a total of 1.73×10~6 tof VOCs were emitted from daily chemical products in China.Daily use products,building coatings,general cleaning products,short-use products,pesticides and FIFRA products,soaps and detergents,VOCs emissions were 8.94×10~5,3.78×10~5,3.97×10~5,3.11×10~4,2.04×10~4 and 0.76×10~4 t.The top ten cities of VOCs emissions from daily chemical products were Shanghai,Beijing,Chongqing,Guangzhou,Wuhan,Nantong,Shaoxing,Chengdu,Shenzhen and Suzhou.Each city contributed about 1.5%～3.4%to total VOCs emissions.（2）Oxygenated VOCs（OVOCs）were the species with the largest emissions,followed by alkanes,alkene,aromatic hydrocarbons and halogenated hydrocarbons.The total OFP of daily chemical products in China was 3.39×10~6 t.Daily use products,architectural coatings,general cleaning products,soaps and detergents,short-use products and pesticides and FIFRA products accounted for 61.25%,19.21%,17.13%,0.31%,1.27%and 0.83%,respectively.Daily use products,architectural coatings,general cleaning products,pesticides and FIFRA products contributed 50.19%,44.54%,3.99%and 1.26%to secondary organic aerosol formation potential（SOAP）,respectively.Short-use products,soaps and detergents contributed less than 1%to SOAP.（3）The total VOCs emissions of daily chemical products from 2006 to 2018 showed a continuous growth trend,and the annual average growth rates of daily use products,general cleaning products and architectural coatings were 9.18%,11.85%and 11.88%,respectively.The growth of VOCs emissions in the general cleaning products sector is mainly dominated by household care disinfectants,up to 44.58%.Perfume in daily use products has the largest increase,from 18.36%to 38.61%,followed by hair care products,sunscreen products,moisturizers and care.Architectural coatings are mainly driven by VOCs emissions from solvent-based coatings.general cleaning products species are mainly OVOCs and alkanes;the products used in daily life are mainly OVOCs and olefins,with a proportion of alkanes is relatively small.The proportion of alkanes,alkene and aromatic hydrocarbons in architectural coatings shows an upward trend.（4）From 2006 to 2018,the OFP of ethanol,isobutane and isopropanol in general cleaning products increased significantly,with annual average growth rates of 10.61%,8.73%and 9.34%,respectively.The growth of ethanol emissions was dominated by household care disinfectants,hand lotions and kitchen cleaners.Daily use of ethanol,limonene,propylene glycol has a large increase,the average annual growth rates were14.35%,10.77%,8.67%,mainly by perfume,sunscreen products,moisturizer and care,hair care products.The growth of SOAP in daily use products is driven by limonene and benzyl alcohol emitted by moisturizer and nursing.SOAP in architectural coatings is contributed by solvent coatings,in which methylcycloundecane and methylcyclodecane are the main contributors to SOAP in architectural coatings.（5）The representative cities in China with severe ozone pollution were analyzed.Among them,VOCs from daily chemical products at Shanghai Xuhui Normal University site had the greatest impact on ozone generation,and the contribution of the maximum daily 8 h concentration of monthly ozone was 1.3%（2.05μg/m~3）.The maximum daily 8h concentration contribution was 2.5%（7.09μg/m~3）,and the maximum hourly ozone concentration contribution was 4.1%（13.00μg/m~3）.Daily chemical products produce about 0.43μg/m~3 ozone per ton of VOCs,while MEIC lists produce about 0.12μg/m~3 ozone per ton of VOCs.It can be seen that although the contribution of daily chemical products VOCs to total ozone is not large,it has high potential for ozone generation. |
PDF Full Text Request