|
KMID : 0381319930320020088
|
|
Korean Journal of Occupational Health
1993 Volume.32 No. 2 p.88 ~ p.104
|
|
|
An Analysis of Ingredient and the States of Measurement of Airborne Mixed Organic Solvents
|
|
Hwangbo Shin-Yi
|
|
|
Abstract
|
|
|
This study was performed to investigate ingredients of organic solvents and present status of environmental measurements with official records of working environmental
measurements of 799 workplaces in 179 workshops used organic solvents.
The result were as follows:
1. The mean of total sampling time and actual time measuring organic solvent were 158 ± 80 min and 72 ±37 min. In 62.5% of 799 samples the air flowrates were above 0.2 ℓ/min.
2. Thirty kinds of organic solvent were detected in the working environments. The most common organic solvent was toluene(95.4%) and followed by xylene(47.1%), MEK(36.5%) and n-hexane(35.3%) in descending order.
3. The average number of species detected per a mixed organic solvent sample was 4.4±2.6, and there was no significant difference in the detection number among type of workplaces.
4. The mean exposure concentrations was the highest in acetone(86.6 ±167.8ppm) and followed by MEK(37.7 ±59.6ppm) and toluene (28.7 ±48.4ppm). While considering the TLV, the mean exposure concentrations were 7.9 ±10.8ppm(TLV:10ppm) in N.N-dimethyl formamide, 4.9 ±5.0ppm(TLV 10ppm) in benzene and 2.1 ±1.5(TLV:5ppm) in methyl cellosolve acetate in descending order.
5. Among the 799 workplaces, 20.0% workplaces were evaluated with exceed TLV in case of sample organic solvents. In case of mixed organic solvents, the TLV exceed rate of workplaces was 40.0%.
6. 72.1% of workplaces were received two consecutive environmental measurements a year and 57.3% of them was not exceeded TLV. The average concentration of organic solvents in the 1st half year was 1.16 ±1.09 and most of them were above 1.0 TLV. The average concentration of the 2nd half year period was 0.81±0.59 which was somewhat lower than those of the 1st half period.
7. The percentage of workplaces with local ventilation was 65.1%. Among them, 25.2% local ventilation was evaluated with poor and 34.9% workplaces was not intalled any local ventilator. According to the performance of ventilator, the concentration of the organic solvents was 0.44 ±0.30 at well-instituted ventilator, that with poorly-instituted was 1.32±0.66 and that with uninstituted was 1.75±1.27.
On the basis of about data, ingradient analysis of mixed organic solvents should be perform prior to evaluation of organic solvents and should evaluated with mixed organic solvent TLV.
|
|
|
KEYWORD
|
|
|
|
|
|
FullTexts / Linksout information
|
|
|
|
|
|
Listed journal information
|
|
|
|
|