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Working Environment Measurement Standards
Ministry of Labour Notification No. 46 of April 22, 1976

Latest Amendments:
Ministry of Health, Labour and Welfare Notification No. 191 of April 27, 2001
作業環境測定基準：原文

Measurement of Concentration of Organic Solvent

  1. Article 13.The measurement of concentration of those organic solvents listed in items 1 to 47 of the Attached Table 6-2 of the Cabinet Order in the air at an indoor workplace prescribed in item 10, Article 21 of the Cabinet Order shall be made according to the classification of substances listed in the left column of Attached Table 2 by using the sampling method listed in the middle column of the Table, or a method having equivalent or higher capacity, and the analytical method listed in the right column of the Table or method having equivalent or higher capacity.
  2. Notwithstanding the provisions in the preceding paragraph the measurement of concentration of those substances in the air listed below may by made by a detector tube. This rule, however, dose not apply to such a case wherein the concentration of one of those substances listed in the following items is measured and a co-existing substance other than the said substance may adversely affect an accurate measurement:
    1. Acetone
    2. Isoprovpyl alcohol
    3. Isopentyl alcohol (otherwise known as isoamyl alcohol)
    4. Ethyl ether
    5. Xylene
    6. Cresol
    7. Chlorobenzene
    8. Chloroform
    9. Isobutyl acetate
    10. Isopropyl acetate
    11. Ethyl acetate
    12. n-Butyl acetate
    13. Carbon tetrachloride
    14. Cyclohexanone
    15. 1,2-Dichloroethylene (otherwise known as acetylene chloride)
    16. N, N-Dimethylformamide
    17. Styrene
    18. Tetrachloroethylene (otherwise known as perchlorethylene)
    19. 1,1,1-Trichloroethane
    20. Trichloroethylene
    21. Tolune
    22. Carbon disulfide
    23. 2-Butanol
    24. Methyl cyclohexanone
  3. Notwithstanding the provision of the preceding two paragraphs, in case of the measurement of substances in items 1 to 47 of Attached Table 6-2 of the Cabinet Order (For substances described in items 2, 6 to 10, 17, 20 to 22, 24, 26, 27, 29, 32, 34, 39, 40, 42 to 45 and 47, this is limited to such a case wherein the items are manufactured or used as a mixture in which the main item is one of the items of the preceding paragraph), it may be done by a method using gas detector tube only under the approval of the Chief of the competent Labour Standards Inspection Office. The approval may be given in cases where the evaluation of working environment measurement which is prescribed in paragraph 1, Article 28-2, Ordinance on Prevention of Organic Solvent Poisoning (Ministry of Labour Ordinance No. 36, 1972) has been done for more than 2 years, and those results are all classified into Control Class 1. In this case, measurement for organic solvents listed in Paragraph 1 should be simultaneously performed at more than one measuring point in the unit work area concerned.
  4. The provisions set forth in item 1 to item 3, paragraph 1 of Article 2 shall apply mutatis mutandis to the measurement provided in the preceding three paragraphs. In this case, "dust of sand and stones, rocks, ores (minerals), metallic materials or carbon" described in item 1 item 1-2 and item 2-2, paragraph 1 of the same Article shall be read as "organic solvent listed in items 1 to 47 of the Attached Table 6-2 of the Cabinet Order" and "relative concentration indication method" described in the proviso of item 3, the same paragraph shall be read as "direct collection method, or a method using a detector tube".
  5. The provision of paragraphs 4 to 7, Article 2 shall apply mutatis mutandis to the approval provided in paragraph 3.
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