| Summary: | 碩士 === 嘉南藥理科技大學 === 環境工程與科學系碩士班 === 96 === Seven fly ash solidification plants and its 43 workers were selected as study subjects. The airborne of PCDD/Fs in the working environment among three plants and serum of workers were collected to measure PCDD/Fs levels. The biochemistry and hormones examinations of 43 workers had been measured. Information obtained from the questionnaire including personal characteristics (sex, age, height, weight, neighborhood geography, etc.), life style (alcohol intake and tobacco usage), occupational history (working histories related to electric arc furnaces, working environment, job titles, working period, and usage of protected equipment, etc.). All the results were integrated to conduct the PCDD/Fs exposure assessment of workers in the fly ash solidification plant.
WHO-TEQ Concentrations of PCDD/Fs of air samples in solidificated product storage area and treatment area of A, C, D plants are 0.236, 0.085, 0.078 pg WHO98-TEQDF /Nm3 and 0.211, 0.086, 0.115 pg WHO98-TEQDF /Nm3 respectively. which are higher than those in ambient air, but lower than those in metal smelting industries. Among 17 PCDD/F congeners, the 2,3,4,7,8-PeCDF were the main congener. High and low exposure groups are divided by the job titles and exposure scenario. The workers who worked in the storage and treatment area were assigned as high exposure group, the maintenance, management workers and the officers were assigned as low exposure groups. Mean and range of TEQ concentrations of PCDD/Fs in serum sample at high and low exposure groups are 12.3 (6.6-23.9) and 8.6 (5.1-12.8) pg WHO98-TEQDF/g lipid, respectively. Significant difference was found between two groups. Higher serum level of 2,3,4,7,8-PeCDF, 1,2,3,6,7,8-HxCDF, 2,3,4,6,7,8-HxCDF, 1,2,3,7,8-PeCDD, 1,2,3,6,7,8-HxCDD in the high exposure group were found and the pattern was the same as the air samples. The serum PCDD/F levels were significantly correlated with age.
Higher abnormal rate of cholesterol, triglyceride, albumin, total protein and testosterone were found in both high and low exposure groups. After integrating the congener patterns of serum and airborne PCDD/Fs, the data shows that the serum PCDD/Fs of high exposure group may be affected by the airborne PCDD/Fs of working environment. The usage of personal protective measures was suggested to effectively reduce the concentrations of serum PCDD/Fs in the high exposure workers. It is also suggested that regular health examination of workers should be implemented each year.
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