Monitoring of environmental and biological exposure levels of xylene in the paint and coating production industries in Dalian
Objective To comprehensively evaluate the occupational hazards of xylene in the industry,and to provide environmental and biological exposure indicators for maintaining the health of workers exposed to xylene.Methods 7 paint and coating enterprises in Dalian were selected to determine the concentration of xylene in the air and the content of methylhippuric acid in the urine of workers at the end of the work shift by individual sampling method,and the relationship between the two was analyzed by rank sum test and Spearman correlation analysis.Results In this study,the excess rate of xylene was 9.3％,the highest value was 156.3 mg/m3,and the excess rate of methylhippuric acid in urine at the end of the shift was 18.6％,the highest value was 1.20 g/g Cr,which was 4 times the biological limit of occupational exposure.The rank sum test showed that the concentration of methylhippuric acid in urine of packing workers was higher than that of feeding(Z=2.118,P＜0.05)and blending workers(Z=2.128,P＜0.05),and that of grinding and stirring workers was higher than that of blending workers(Z=2.124,P＜0.05).The concentration of xylene in the workplace was positively correlated with the methylhippuric acid in the urine at the end of the work day.Conclusion Attention should be paid to the occupational hazards of xylene in packaging,grinding and mixing workers in this industry,to ensure the effectiveness of occupational disease prevention facilities,to equip workers with gas masks and enough filter boxes,and to effectively improve the compliance of workers wearing gas masks.
Paint and coatings industryXyleneMethylhippuric acidBiological monitoring
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