Abstract:To investigate the characteristic of atmospheric ammonia pollution and its influence on the secondary inorganic components of PM_2.5， online measurements of atmospheric ammonia and aerosol components have been conducted in Nanjing， Wuxi， Zhenjiang， Changzhou and Xuzhou of Jiangsu Province， simultaneously from 2021 to 2022， the effect of ammonia emission reduction of Jiangsu province have been evaluated by ISORROPIA model. As a result， the average annual ammonia concentration in five cities was 10.1μg/m³， and the concentration in different cities ranged from 7.7 μg/m³（Nanjing） to 15.2 μg/m³（Xuzhou）. The peak concentration of total ammonia was observed in June in summer. Influenced by temperature and thermal equilibrium of ammonium nitrate， the mass concentration of ammonia peaked at noon， while the ammonium increased at night and decreased during daytime. The five cities are at the ammonia rich level and the aerosol is neutral throughout the year. The potential of ammonia to neutralize extra acidic gas is strong. All the cities in Jiangsu Province can achieve significant reductions of PM_2.5 mass concentrations only through prominent reductions of ammonia emission(more than 60%)， while the reductions of SO₂ and NO_X can mitigate PM_2.5 pollution more efficiently.

Abstract:Ambient air concentration of 102 volatile organic compounds(VOCs) species had been determining by online GC-FID/MS（TH-300B）from January 1， 2020 to March 31， 2020 during the Spring Festival in petrochemical industrial area of Shanghai. Variety of composition and concentration of VOCs， diurnal， chemical reactivity and sources of VOCs during different period were analyzed. The results showed that φ(VOCs) during the Spring Festival was 17.1×10^-9， which declined 59.0% than that before the Spring Festival. The contribution rate of aromatic and halohydrocarbon which related to solvent use and petrochemical industry decreased significantly， the contribution rate of aromatic decreased from 17.7% to 11.1%， halohydrocarbon decreased from 13.7% to 8.8%. The potential of ozone generation decreased significantly during the Spring Festival. Key active components were ethylene，toluene，propylene，m/p-xylene and n-butane. Toluene/benzene ratio showed that before the Spring Festival， the main sources of VOCs were anthropogenic emissions from petrochemical industrial park， fine chemical industrial parks nearby and motor vehicle exhaust. During the Spring Festival，the impact of emissions of solvent use was significantly weakened，and it was affected by multiple sources such as industrial，motor vehicle exhaust，solvent use and combustion. During the gradual resumption of work，the impact of emissions from fine chemical industrial parks began to increase， but it was still less than level of pre-Spring Festival activities. Comparison and analysis on the effects of petrochemical park control on variation of VOCs concentration and photochemical activity provide scientific support for VOCs emission reduction and control measures.

Abstract:Black carbon（BC） was measured in Suzhou from December 1， 2020 to November 30， 2021， using a sevenchannel aethalometer（AE-31）. The variation characteristics of BC were obtained. BC sources were explored based on the aethalometer model， a hybrid single particle Lagrangian integrated trajectory model（HYSPLIT） and concentration weighted trajectory（CWT）. The results showed the annual average concentration of BC was 1.29 μg/m³ with a standard deviation of 0.64 μg/m³， the BC concentration was the highest in the winter［（1.61±0.89）μg/m³］， followed by the autumn［（1.34±0.61）μg·m³］， spring［（1.23±0.48）μg/m³］， and was the lowest in summer［（1.03±0.43）μg/m³］. The daily variation of BC concentration on weekdays and holidays in each season showed a bimodal structure in the morning and evening. Besides， BC concentration was negatively correlated with wind speed， air temperature and precipitation， but not with relative humidity. The source apportionment of BC showed that compared with the solid fuel（e.g.，coal and biomass combustion）， the liquid fuel（e.g.，vehicle emission） had higher contribution to total BC concentration during all seasons（74.2%～76.3%）. The contribution of liquid fuel to the total BC was higher in summer， while solid fuel had a higher contribution in winter. The results of hybrid single particle Lagrangian integrated trajectory（HYSPLIT） and concentration weighted trajectory（CWT） showed that the potential sources of BC in Suzhou were slightly different in different seasons and were affected by the different air mass sources. However， the main potential source regions were from the southwest part.

Abstract:Using solidphase extraction and ultrahighperformance liquid chromatographytandem mass spectrometry(SPEUPLCMSMS)， 17 per and polyfluoroalkyl substances(PFASs) were analyzed in wastewater from three wastewater treatment plants in Guangxi（P1、P2、P3）. The findings revealed 10 PFASs were detected with detection rates ranging from 33.3% to 100%. PFASs concentrations in influent and effluent ranged from 32.0 to 86.4 ng/L and 23.0 to 39.6 ng/L， respectively. Notably， perfluorobutanoic acid(PFBA)， perfluoropentanoic acid(PFPeA)， and perfluorooctanoic acid(PFOA) dominated the pollution profile. The anaerobicanoxicoxic(AAO) process exhibited a 49.0% removal efficiency， while the modified sequencing batch reactor(MSBR) achieved 72.2%， and the oxidation ditch process achieved 25.0%. Sewage was the main source of PFASs in influent of P1 and P3， but in influent of P2， the main sources of PFASs were sewage and industrial wastewater. Furthermore， PFDoDA in P1 effluent posed a high ecological risk to fish and water fleas， and a moderate risk to algae， while P2 and P3 effluents showed lower ecological risks to the receiving rivers.

Abstract:This paper analyzed the characteristics of PM_2.5 pollution in 16 cities in Shandong Province from 2019 to 2022， and evaluated the forecasting effects in 2021 and 2022 of four numerical models(CMAQ， CAMx， WRFChem， NAQPMS) and ensemble forecasting model. The results showed as follows： The average annual concentration of PM_2.5 in Shandong Province from 2019 to 2022 has decreased year by year， and the pollution degree has gradually decreased. However， the phenomenon of PM_2.5 concentrations exceeding the national standard often occurred in the months of JanuaryMarch and NovemberDecember.After updating of the pollutant emission inventory of models at the end of 2021， the 24hour level accuracy and correlation coefficient(r) of the five models increased year on year in 2022， and the root mean square error(RMSE) decreased year on year. Although the model forecast accuracy was improved， CMAQ， CAMx， WRFChem， and ensemble forecasting model were easy to miss or underforecast the moderately and heavily polluted weather of PM_2.5， due to that the parameter adjustment was slightly larger. Since the heterogeneous chemical reaction mechanism was improved when the pollution emission inventory of NAQPMS was updated， the forecast accuracy of different levels of PM_2.5 days was significantly improved， especially on the moderately and heavily polluted days.

Abstract:Based on the air quality monitoring data and correlative meteorological data in Qingyuan City from 2016 to 2021， the characteristics of meteorological elements and potential pollution source areas under different PM_2.5 pollution weather patterns in Qingyuan were analyzed using statistical analysis， subjective weather classification and HYSPLIT model， which provides effective reference for fine management on air pollution prevention and control. The results indicated that： The PM_2.5 pollution in Qingyuan mainly occurs in nonprecipitation or microprecipitation weather when the daily average wind speed is less than 2 m/s， the average relative humidity is between 75% and 90% and the average temperature is between 18~22 ℃.The typical weather types causing PM_2.5 pollution in Qingyuan are transformed cold high ridge， frontal low trough and behind ridge， front of cold front， weak cold high ridge， southwest to high and peripheral subsidence of typhoon. The heavy PM_2.5 pollution only occurred under the control of the weak cold high ridge weather pattern in autumn and winter; the frequency of the slight and moderate PM_2.5 pollution is the highest under transformed cold high ridge weather conditions; frontal low trough and behind ridge is the main weather type that causes PM_2.5 pollution of Qingyuan City in spring; and the pollution is relatively low under front of cold front， southwest to high and peripheral subsidence of typhoon. HYPLIT trajectory clustering analysis shows that the main airflow trajectories aggravating PM_2.5 pollution in Qingyuan are southerly airflow and northsouth airflow convergence. The potential source areas of PM_2.5 pollution are mainly located in Qingyuan urban area and Pearl River Delta cities such as Guangzhou， Foshan， Dongguan， Jiangmen， etc under the control of southerly airflow， and south of Qingyuan， Shaoguan and the Pearl River Delta， where under the control of southnorth airflow convergence， are the potential areas of PM_2.5 pollution， longdistance transportation in the north direction will be weaken by the blocking effect of the Nanling Mountain.

Abstract:A method for simultaneous determination of 23 sedative residues in aquaculture water by isotope dilution liquid chromatography tandem mass spectrometry(LC-MS/MS) was established. The samples were filtered by 0.45 μm filter membrane， purified by solid phase extraction column(Oasis HLB column)， then concentrated the eluate and brought to volume with 50% methanol 50% water. By using 1% formic acid aqueous solution and acetonitrile as mobile phase， the targets were separated by an Agilent InfinityLab Poroshell 120 SB-C18 chromatographic column， and determined in multi reaction monitoring mode and quantified by internal standard method. The results showed that the linearity of 28 sedatives was good in the concentration range of 0.5～100 ng/L (r > 0.99)， and the detection limits and quantitative limits were 0.1～0.3 and 0.4～1.0 ng/L， respectively. The average recovery was 73.5%～117.6% and the relative standard deviations(RSD) were 1.1%～ 9.9%. This method has simple pretreatment， good purification effect and high sensitivity. It can be used for the rapid detection of 23 sedative drug residues in pond aquaculture water.

Abstract:A novel fluorescent probe PTAID was successfully used to detect Pd²⁺ and Cu²⁺ in soil by solid form. The detection limits of PTAID for Pd²⁺ and Cu²⁺ were 0.63 and 1.19 μmol/L， respectively， indicating that the probe PTAID had high sensitivity to Pd²⁺ and Cu²⁺. Experiments on condition optimization showed that the probe PTAID can quickly detect Pd²⁺ and Cu²⁺ in the range of pH 4.0~12.0 and the reaction time is 0~15 min. Compared with ICP-OES method， it has higher accuracy and precision， and has the advantages of high sensitivity， strong selectivity， fast and strong antiinterference.

Abstract:In this study, an accelerated solvent extraction-gel permeation chromatographygas chromatography-mass spectrometry method was established for the determination of 23 organochlorine pesticides in agricultural soil, the optimization experiments were carried out on accelerated solvent extraction, parallel evaporation and purification methods. The method detection limits of the targets were in the range of 0.0034~0.0052 mg/kg. Six parallel analyses were performed on spiked soil samples with 0.25 mg/kg, and the recoveries ranged from 82.0% to 93.7%, the relative standard deviations (RSD) were less than 8.7%. The certified quality control samples were analyzed, and the results were all within the acceptance range. The method is accurate, reliable, sensitive, and has good sample purification effect, which can meet the requirements of trace analysis of organochlorine pesticide residues in soil of agricultural land.

Abstract:An analytical method for the determination of six perfluorocarboxylic acids(PFCs) in soil was established by accelerated aqueous solvent extraction coupled with ultra performance liquid chromatography tandem mass spectrometry(UPLC-MS/MS)， and the chromatographic conditions， aqueous solvent extraction conditions， solid phase extraction column cleanup conditions and the selection of experimental materials were optimized. The results showed that the six PFCs could be analyzed on an ACQUITY UPLC BEH C18 column with 2.0 mmol/L methanol ammonium acetate aqueous solution as the mobile phase in a gradient elution mode in 9 min， and the limits of detection(LODs) were in the range of 0.03～0.4 μg/kg. The recoveries of the spiked PFCs for the determination of the actual soil samples were in the range of 90.7 %～118 %， and the relative standard deviations(RSD) were 5.6 %～18.0 %， which showed good precision and accuracy. The method is simple and easy to operate， and the instrumental detection efficiency is high with accurate results， which can meet the requirements for the determination of PFCs in soil.

Abstract:At present， there is no unified evaluation standard for various technical indicators and performance of portable detectors， which leads to the intermingled performance of the instruments， the quality of monitoring data is difficult to be guaranteed， and the requirements of the management department are not met， and it is also difficult for the testing agency to choose during the procurement process. To solve this problem， this study established a comprehensive evaluation model of portable detector， determined the comprehensive evaluation indicators， formulated the comprehensive evaluation criteria， and selected relevant instruments and related items for comprehensive evaluation. The results show that the evaluation method comprehensively considers various factors affecting the portable detector and can be well applied to the evaluation and selection of portable detector. From the evaluation results， it is found that most portable water quality detection instruments do well in portability and ease of operation， however， the accuracy and precision need to be improved. The current evaluation method takes various factors that impact the performance of portable detectors into consideration， which provides reference to evaluation and selection of portable water quality detector.

Abstract:To improve the environmental improvement effect of water diversion projects， it is necessary to analyze the selfconnection level， water quality status and main influencing factors of water environment. This study takes the Yuejin polders which located in Taihu basin as the research object， uses the graph theory connectivity theorem to evaluate the static base flow connectivity in the study area， furtherly explores the spatial differences and variation characteristics of the connectivity of water systems in the study area. Meanwhile， shortterm water diversion experiments were carried out， and the fuzzy comprehensive analysis method was used to evaluate the changes of water quality and the response relationship between the water environment and water system connectivity. The results show that the fuzzy comprehensive evaluation method has applicability in the analysis of water environment improvement， and could realize a comprehensive analysis of the water quality changes. Water fluidity is an important environmental factor affecting the water quality， and permanganate index is the main influencing factor that leads to the deterioration of water quality in the study area. The water diversion project has a certain continuous improvement effect on the water environment in the polder area， but the improvement effect is limited in the area with poor base flow connectivity.

Abstract:In order to comprehensively grasp the changes of water quality along the Han River after it enters and leaves Xiangyang urban area， and reasonably formulate corresponding protection measures， a comprehensive analysis and evaluation of the water environment quality， change trend and related characteristics of Xiangyang section of Han River is carried out based on the water quality monitoring data of the exit section， entry section and tributaries of Xiangyang urban section of Han River from 2018 to 2022. The results showed that the water quality of exit and entry sections of Xiangyang urban section of the Han River from 2018 to 2022 was generally good， but the main indices of ammonia nitrogen， total phosphorus and total nitrogen in exit sections were significantly higher than those in entry sections， and the inflow of major tributaries Tangbai River， Qing River and Nanqu River had a greater impact on the water quality of exit sections. From 2018 to 2021， the concentrations of the main monitoring indicators during the water period were greater than those in the dry period， while that were quite the reverse in 2022. The contribution of nitrogen pollution to water quality in Xiangyang urban section of Han River was obviously higher than that of phosphorus pollution， which was still mainly nitrogen pollution， and nitrogen in water quality mainly exists in forms other than free ammonia and ammonium salt. The correlation analysis results showed that the correlation between ammonia nitrogen and the other indicators in entry sections was inconsistent with that in exit sections， the same inconsistence was observed between total nitrogen and the other indicators. While the correlation between total phosphorus and dissolved oxygen and other parameters were basically consistent. The results can provide scientific basis for the improvement of water environment and pollution control measures of Han River.

Abstract:To investigate the heavy metal content in the tap water of Yongqiao District， Suzhou City， water samples from 24 towns were collected during the period from July to August 2021. The contents of As，Cd，Cr，Cu，Fe，Mn，Ni，Pb and Zn in the water were measured， and the pollution level of heavy metals was evaluated by the single factor index method and Nemerow comprehensive pollution index method. The results showed that the average concentration of heavy metals in descending order was: Mn>Zn>Fe>Cu>Cr>As>Ni>Pb>Cd. Compared with the “Standards for drinking water quality”（GB 5749—2022）， Mn has the highest exceeding rate（up to 4.17%）， and the concentration of the other 8 heavy metals are all below the value set by the above standard； The average of the single factor pollution index（Pi） in descending order is as follows: Mn（0.248）>As（0.063）>Pb（0.041）>Cr（0.028）>Ni（0.023）>Fe（0.020）>Zn（0.010）>Cd（0.005）>Cu（0.002）； The comprehensive pollution index（Pn） showed only the water plant in Taogou Town has mild pollution， while others are within the safe range. From a spatial distribution perspective， the high values of Pn and Mn single factor pollution index are mainly distributed near Taogou and Zhuxianzhuang. Among the measured heavy metals， Mn is the priority pollution control heavy metal for the water plant. This study can provide a basis for the prevention and control of heavy metal pollution and the optimization of the water treatment process for township waterworks in Yongqiao District.

Abstract:To study the water ecoenvironment quality of seagoing rivers in Yancheng， a survey on periphytic algae community structure in main seagoing rivers of Yancheng was conducted in May and September 2022， and the water ecology of 10 seagoing rivers were evaluated based on rivers water eco-environment quality comprehensive evaluation index. The results showed that the proportion of sections with good-quality surface water reaching Grade III and above was 70% throughout the year， and the permanganate index and dissolved oxygen were the main influencing factors on the water quality of the section. Shannon-Wiener index（H′）was between 2.77~4.4， with a mean value at 3.97. The overall evaluation level was excellent. The survey found that there were 7 phylum of periphytic algae， including diatoms， green algae， cyanobacteria， euglenophyta， dinoflagellates， cryptophytes， and xanthophyta， a total of 129 species； 88 species（genera） were found in May， and 95 species（genera） were found in September. Diatom dominated the community all over the year. 80% of the total sections were good or above according to ecoenvironment quality comprehensive evaluation index， water quality and habitat were the main factor constraining the water ecoenvironment quality comprehensive evaluation index of seagoing rivers.

Abstract:As the number of socialized environmental monitoring institutions increases， the uneven quality of their work has led to the decline of the environmental monitoring data quality， and also brought great challenges to the supervision and management. This paper summarizes the development status， existing problems and the major existing regulatory policies of socialized environmental monitoring institutions， and puts forward the following suggestions for strengthening the supervision of socialized environmental monitoring institutions： improving the supervision system and strengthening supervision measures， promoting highquality development of the industry， paying highly attention to talent training; promoting the application of new quality control technologies， establishing thirdparty engineering supervision system and promoting the application of unified quality control samples.

Abstract:Accordingto Law of the Peoples Republic of China on the Prevention and Control of Soil Pollution， Jiangsu Province has established and publicly disclosed List of Risk Management and Remediation of Soil Pollution of Construction Land(hereinafter referred to as List). Systematic analysis on the pollution situation of 116 sites on the List showed that in terms of regional distribution， the number and area of contaminated land included in the list are related to the level of regional economic development，with Nanjing，Wuxi，Changzhou and Suzhou ranking among the top. In terms of pollution media， 53% of the sites have complex pollution of both soil and water and 64% of the plots have a deeper maximum depth of groundwater pollution compared to the maximum depth of soil pollution in the same plot. In terms of pollution factors， 167 kinds of pollutants were counted， of which heavy metals， petroleum hydrocarbons and polycyclic aromatic hydrocarbons were the most common， and about 50% of the pollutants were not included in the current construction land soil and groundwater pollution assessment standards in China. In terms of remediation technologies， out of the 31 plots that have been repaired and removed from the Lists， 17% of the contaminated soil and 25% of the contaminated groundwater were remediated using in situ techniques. Based on the statistical characteristics of polluted sites listed in Jiangsu Province， targeted recommendations have been proposed， such as improving the soil environment standard system， exploring coordinated remediation mode for groundwater and soil， and speeding up green and lowcarbon remediation of polluted soil，to promote scientific development of the soil and groundwater environmental management and pollution control industry.