Industrial coking facilities are an important emission source for volatile organic compounds(VOCs).This study analyzed the atmospheric VOC characteristics within an industrial coking facility and its surrounding envir...Industrial coking facilities are an important emission source for volatile organic compounds(VOCs).This study analyzed the atmospheric VOC characteristics within an industrial coking facility and its surrounding environment.Average concentrations of total VOCs(TVOCs)in the surrounding residential activity areas(R1 and R2),the coking facility(CF)and the control area(CA)were determined to be 138.5,47.8,550.0,and 15.0μg/m^(3),respectively.The cold drum process and coking and quenching areas within the coking facility were identified as the main polluting processes.The spatial variation in VOCs composition was analyzed,showing that VOCs in the coking facility and surrounding areas were mainly dominated by aromatic compounds such as BTX(benzene,toluene,and xylenes)and naphthalene,with concentrations being negatively correlated with the distance from the coking facility(p<0.01).The sources of VOCs in different functional areas across the monitoring area were analyzed,finding that coking emissions accounted for 73.5%,33.3% and 27.7% of TVOCs in CF,R1 and R2,respectively.These results demonstrated that coking emissions had a significant impact on VOC concentrations in the areas surrounding coking facility.This study evaluates the spatial variation in exposure to VOCs,providing important information for the influence of VOCs concentration posed by coking facility to surrounding residents and the development of strategies for VOC abatement.展开更多
Fugitive emission has been becoming an important source of volatile organic compounds(VOCs) in pharmaceutical industry,but the exact contribution of fugitive emission remains incompletely understood.In present study,p...Fugitive emission has been becoming an important source of volatile organic compounds(VOCs) in pharmaceutical industry,but the exact contribution of fugitive emission remains incompletely understood.In present study,pollution characteristics,odorous activity and health risk of stack and fugitive emissions of VOCs from four functional units (e.g.,workshop,sewage treatment station,raw material storage and hazardous waste storage) of three representative pharmaceutical factories were investigated.Workshop was the dominant contributor to VOCs of fugitive emission in comparison with other functional units.Extreme high concentration of VOCs from fugitive emission in unsealed workshop (94.87 mg/m^(3))was observed relative to sealed one (1.18 mg/m^(3)),accounting for 31%and 5%of total VOCs,respectively.Fugitive emission of VOCs in the unsealed workshop mainly consisted of nhexane,1-hexene and dichloromethane.Odorous activity indexes and non-cancer hazard ratios of these VOCs from fugitive emission in the unsealed workshop were as high as that from stack exhaust.Furthermore,cancer risk of dichloromethane from fugitive emission and stack exhaust was up to (1.6-1.8)×10^(-5).Odorous activity or health risk index of the VOCs from fugitive emission was up to 13 or 11 times of the corresponding threshold value,posing remarkable health threat on pharmaceutical workers.Our?ndings highlighted the possibly underestimated contribution of fugitive emission on VOCs in the pharmaceutical industry.展开更多
As more attention is being paid to the characteristics of atmospheric amines,there is also an increasing demand for reliable detection technologies.Herein,a method was developed for simultaneous detection of atmospher...As more attention is being paid to the characteristics of atmospheric amines,there is also an increasing demand for reliable detection technologies.Herein,a method was developed for simultaneous detection of atmospheric amines in both gaseous and particulate phases using gas chromatography-mass spectrometry(GC-MS).The amine samples were collected with and without phosphoric acid filters,followed by derivatization with benzenesulfonyl chloride under alkaline condition prior to GC-MS analysis.Furthermore,the method was optimized and validated for determining 14 standard amines.The detection limits ranged from0.0408-0.421μg/mL(for gaseous samples)and 0.163-1.69μg/mL(for particulate samples),respectively.The obtained recoveries ranged from 68.8%-180%and the relative standard deviation was less than 30%,indicating high precision and good reliability of the method.Seven amines were simultaneously detected in gaseous and particulate samples in an industrial park using the developed method successfully.Methylamine,dimethylamine and diethylamine together accounted for 76.7%and 75.6%of particulate and gaseous samples,respectively.By comparing the measured and predicted values of gas-particle partition fractions,it was found that absorption process of aqueous phase played a more important role in the gas-partition of amines than physical adsorption.Moreover,the reaction between unprotonated amines and acid(aq.)in water phase likely promoted water absorption.Higher measured partition fraction of dibutylamine was likely due to the reaction with gaseous HCl.The developed method would help provide a deeper understanding of gas-particle partitioning as well as atmospheric evolution of amines.展开更多
基金supported by the National Key R&D Program of China(Nos.2019YFC1804502 and 2019YFC1804503)the Guangdong Provincial Natural Science Fund for Distinguished Young Scholars(No.2022B1515020051)+2 种基金the National Natural Science Foundation of China(No.42077332)the Science and Technology Program of Guangzhou(No.202201010149)the Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program(No.2017BT01Z032)。
文摘Industrial coking facilities are an important emission source for volatile organic compounds(VOCs).This study analyzed the atmospheric VOC characteristics within an industrial coking facility and its surrounding environment.Average concentrations of total VOCs(TVOCs)in the surrounding residential activity areas(R1 and R2),the coking facility(CF)and the control area(CA)were determined to be 138.5,47.8,550.0,and 15.0μg/m^(3),respectively.The cold drum process and coking and quenching areas within the coking facility were identified as the main polluting processes.The spatial variation in VOCs composition was analyzed,showing that VOCs in the coking facility and surrounding areas were mainly dominated by aromatic compounds such as BTX(benzene,toluene,and xylenes)and naphthalene,with concentrations being negatively correlated with the distance from the coking facility(p<0.01).The sources of VOCs in different functional areas across the monitoring area were analyzed,finding that coking emissions accounted for 73.5%,33.3% and 27.7% of TVOCs in CF,R1 and R2,respectively.These results demonstrated that coking emissions had a significant impact on VOC concentrations in the areas surrounding coking facility.This study evaluates the spatial variation in exposure to VOCs,providing important information for the influence of VOCs concentration posed by coking facility to surrounding residents and the development of strategies for VOC abatement.
基金supported by the National Key R&D Program of China (No. 2019YFC0214402)the National Nature Science Foundation of China (Nos. 41805103, 42177354, and 21777032)+1 种基金the Natural Science Foundation of Guangdong Province (No. 2021A1515011492)the Science and Technology Program of Guangzhou (No. 202102020451)。
文摘Fugitive emission has been becoming an important source of volatile organic compounds(VOCs) in pharmaceutical industry,but the exact contribution of fugitive emission remains incompletely understood.In present study,pollution characteristics,odorous activity and health risk of stack and fugitive emissions of VOCs from four functional units (e.g.,workshop,sewage treatment station,raw material storage and hazardous waste storage) of three representative pharmaceutical factories were investigated.Workshop was the dominant contributor to VOCs of fugitive emission in comparison with other functional units.Extreme high concentration of VOCs from fugitive emission in unsealed workshop (94.87 mg/m^(3))was observed relative to sealed one (1.18 mg/m^(3)),accounting for 31%and 5%of total VOCs,respectively.Fugitive emission of VOCs in the unsealed workshop mainly consisted of nhexane,1-hexene and dichloromethane.Odorous activity indexes and non-cancer hazard ratios of these VOCs from fugitive emission in the unsealed workshop were as high as that from stack exhaust.Furthermore,cancer risk of dichloromethane from fugitive emission and stack exhaust was up to (1.6-1.8)×10^(-5).Odorous activity or health risk index of the VOCs from fugitive emission was up to 13 or 11 times of the corresponding threshold value,posing remarkable health threat on pharmaceutical workers.Our?ndings highlighted the possibly underestimated contribution of fugitive emission on VOCs in the pharmaceutical industry.
基金supported from the National Natural Science Foundation of China(Nos.42020104001 and 41805103)Local Innovative and Research Team Project of Guangdong Pearl River Talents Program(No.2017BT01Z032)the Fund from Chemistry and Chemical Engineering Guangdong Laboratory(No.1922009)
文摘As more attention is being paid to the characteristics of atmospheric amines,there is also an increasing demand for reliable detection technologies.Herein,a method was developed for simultaneous detection of atmospheric amines in both gaseous and particulate phases using gas chromatography-mass spectrometry(GC-MS).The amine samples were collected with and without phosphoric acid filters,followed by derivatization with benzenesulfonyl chloride under alkaline condition prior to GC-MS analysis.Furthermore,the method was optimized and validated for determining 14 standard amines.The detection limits ranged from0.0408-0.421μg/mL(for gaseous samples)and 0.163-1.69μg/mL(for particulate samples),respectively.The obtained recoveries ranged from 68.8%-180%and the relative standard deviation was less than 30%,indicating high precision and good reliability of the method.Seven amines were simultaneously detected in gaseous and particulate samples in an industrial park using the developed method successfully.Methylamine,dimethylamine and diethylamine together accounted for 76.7%and 75.6%of particulate and gaseous samples,respectively.By comparing the measured and predicted values of gas-particle partition fractions,it was found that absorption process of aqueous phase played a more important role in the gas-partition of amines than physical adsorption.Moreover,the reaction between unprotonated amines and acid(aq.)in water phase likely promoted water absorption.Higher measured partition fraction of dibutylamine was likely due to the reaction with gaseous HCl.The developed method would help provide a deeper understanding of gas-particle partitioning as well as atmospheric evolution of amines.