HYD RO CAR BO NS, AR OM ATIC : MET HO D 150 1, Issue 3, dated 15 M arch 200 3 - page 6 of 7
TABLE 2. PERMISSIBLE EXPOSURE LIMITS, PPM NIOSH
ACGIH mg/m3 per ppm
OSHA TWA
TWA
C
1
0.1a
1
10
10
50 (skin)
50 (skin)
ethylbenzene
100
100
125
100
125
4.34
"-methylstyrene
100
50
100
50
100
4.83
$-methylstyrene
100
50
100
50
100
4.83
toluene
200
100
150
50 (skin)
o-xylene
100
100c
150
100
150
4.34
m-xylene
100
100
100
150
4.34
p-xylene
100
100
100
150
4.34
styrene
100
50
50
100 (skin)
4.26
Substance benzene p-tert-butyltoluene cumene
STEL
TLV
STEL
10b
3.19
1
6.06
50 (skin)
4.91
20
100
3.77
a
Potential carcinogen Suspect carcinogen c Group I Pesticide
b
a
TABLE 3. SAMPLING FLOWRATE , VOLUME, CAPACITY, RANGE, OVERALL BIAS AND PRECISION
Substance benzene
Sampling Flowrate Volumeb (L) (L/min) MIN MAX
- 0.20
5
30
Breakthrough Volume @ Concentration (L) (mg/m3 ) >45
149
Range at VOL-MIN (mg/m3 )
Bias (%)
42 - 165
Overall Precision (ÖrT )
Accuracy (±%)
-0.4
0.059
11.4
c
p-tert-butyltoluene
- 0.20
1
29
44
112
29 - 119
-10.3
0.071
20.7
cumene
- 0.20
1
30
>45
480
120 - 480
5.6
0.059
15.2
-7.6
c
17.1
c
ethylbenzene
- 0.20
1
24
35
917
222 - 884
0.089
"-methylstyrene
- 0.20
1
30
>45
940
236 - 943
-7.6
0.061
16.9
$-methylstyrene
- 0.20
1
30
>45
940
236 - 943
-7.6
0.061
16.9
toluene
- 0.20
1
8
12
2294
548 - 2190
1.6
0.052
10.9
xylene (o-,m-,p-)
- 0.20
2
23
35
870
218 - 870
-1.2
0.060
12.2
styrene
<1.00
1
14
21
1710
426 - 1710
-7.9
0.058c
16.7
a b
c
Minimum recommended flow is 0.01 L/min. VM in = minimum sample volume @ OSHA TWA; VM a x = maximum sample volume @ OSHA TWA Corrected value, calculated from data in Reference 5.
NIOSH Manual of Analytical Methods (NMAM), Fourth Edition
