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Table 3 Group 1 solvents detected in laboratory air, as classified by research fields

From: Use of organic solvents in large research institutions in Japan

Group 1 solventsa

Research fields

p by χ 2 test 

AGR

BIOL

MED

SCI

T&E

Total

Biological vs. chemicalc`

AGR vs. othersd

T&E vs. otherse

No. of laboratories surveyed

594

664

1017

1089

1153

4517

   

Carbon disulfide (%)b

0 (0.0)

5 (0.8)

0 (0.0)

0 (0.0)

0 (0.0)

5 (0.1)

naf

naf

naf

Carbon tetrachloride (%)b

2 (0.3)

9 (1.4)

2 (0.2)

2 (0.2)

12 (1.0)

27 (0.6)

ns

naf

<0.05

Chloroform (%)b

203 (34.2)

183 (27.6)

285 (28.0)

143 (13.1)

337 (29.2)

1151 (25.5)

<0.01

<0.01

<0.01

1,2-Dichloroethane (%)b

4 (0.7)

10 (1.5)

1 (0.1)

4 (0.4)

43 (3.7)

62 (1.4)

<0.01

naf

<0.01

Trichloroethylene (%)b

0 (0.0)

2 (0.3)

0 (0.0)

0 (0.0)

3 (0.3)

5 (0.1)

naf

naf

naf

Sum (%)b

209 (35.2)

209 (31.5)

288 (28.3)

149 (13.7)

395 (34.3)

1250 (27.6)

   
  1. aTwo solvents, 1,2-dichloroethylene and 1,1,2,2-tetrachloroethane, were not detected
  2. bPercentage over the numbers of laboratories surveyed
  3. cComparison between biological (AGR + BIOL + MED) laboratories versus. chemical (SCI + T&E) laboratories; ns for p > 0.05
  4. dComparison between AGR laboratories versus other 4 groups (i.e., BIOL + MED + SCI + T&E)
  5. eComparison between T&E laboratories versus other 4 groups (i.e., AGR + BIOL + MED + SCI)
  6. fna, χ 2 test is not applicable, because the number in a cell (or some cells) is less than five
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Environmental Health and Preventive Medicine

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