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PASSIVE MONITORS
Conoco Chemical* Company A Division of Conoco Inc. 15990 North Barker's Landing Road
P.0. Box 19029 Houston, TX 77224
May 14, 1982
Mr. Frank Snowden 3M Company 230-B 3M Center St. Paul Minnesota
55144
Dear Frank:
As we discussed today, enclosed is an abstract of our internal report and the tabulated data from our evaluation of the 3520 OVM. As agreed, it is our understanding that this data will be held confidential as to source.
We appreciate the opportunity of working with 3M in evaluating the 3520 and trust that such cooperative efforts will continue.
Sincerelv.
Thomas G. Grumbles, Director Industrial Hygiene
ajo Enclosure
cc Paul Fetzer
VVC 000009844
The field study portion included personnel testing during the initial shutdown phase of a plant maintenance turnaround, vinyl chloride tank car loading opera tions and miscellaneous work functions during normal plant operations. These data are surrmarized in Table I. During the field study seven valid samples, according to Ws/Wp ratio, were ob tained on the twenty-five testings conducted. In examining the field study data, it is interesting to note that in the presence of ethylene dichloride (EDC), more vinyl is found on the secondary wafer than on the primary. Little or no EDC was ever found on the secondary wafer as indicated by the Ws/Wp ratio. The vinyl chloride concentration shown for the two monitors agreed within 0.1 ppm on 14 of 25 samples. Only 4 of the 12 turnaround maintenance samples were in this group. The data appears to indicate that EDC displaced the vinyl chlor ide component from the primary badge back to the atmosphere in the #3500 moni tor and onto the secondary section in the #3520 monitor.
The data for the standards study conducted in the laboratory are shown in Table II and graphically represented in Figure I for vinyl chloride and in Figure II for EDC. These data substiate the observation made from the field tiata concerning EDC in that it remains on the primary absorbent wafer. Our standards data for vinyl chloride supports the study conducted by 3M and shows how rapidly the vinyl chloride is transferred to the secondary absorbent or eliminated to the atmosphere. This study indicates that for a combined gas, 8.20 ppm mole vinyl chloride and 9.8 ppm mole EDC, the #3520 provides a valid sample for at least 6hours, Figure I. It appears that the single badge, #3500, began losing the vinyl chloride almost imediately when compared to the corrected value for the #3520 dual wafer badge. Additional work will be required with lower concentration standards to deter mine where it becomes practical to use the #3520 monitor in place of the #3500 monitor.
VVC 000009845
Sample No. a b c d e f 9 h i j k 1 m n 0 P. q r s t u
V
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X
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TABLE I
FIELD STUDY COMPARISON '3-M #3500 AND #3520 BADGES VINYL CHLORIDE AND ETHYLENE DICHLORIDE
Samole Time-Min.
500 475 465 465 480 490 450 450 440 440 430 480 445 450 420
470 410 495 450 470 450 450 480 490 450
PPM YCM
#3500
#3520
0.33
0.89
0.06
0.89
0.07
0.13
0.23
0.27
0.04 0.26
0.13 0.59
0.14
0.45
0.06
0.19
0.17 0.06
0.62 0.25
0.05 0.03
0.10 0.07
N.D.
N.D.
N.D. 0.21 N.D. 0.14
N.D. 2.34 0.11 0.21
<0.01
0.16
0.09 0.04
0.15 0.04
0.01
0.01
0.02 0.02
0.06 0.04
0.04
0.05
0.04
0.07
%
1.08 1.47 0.84 0.33 1.48 0.78 1.12 1.61 1.59 2.47 1.13 1.80
3.95 0 0.65 0 0.16 0.33 0 0.67 1.09 0.46 0.53
#3500
PPM EDC #3520
Ws
3.11 3.00
3.74 3.79
0 0
22.56
24.25
0
7.81
8.72
0
17.17 31.71 11.57
16.79 31.79 11.96
0 0 0
9.70 46.38 100.40 13.20
9.54 23.80 20.58 13.89
0 0 0.01 0
5.08
4.78
0
N.D.
N.D.
N.D.
N.D.
N.D.
N.D.
N.D. 1.10 0.36 0.17
N.D. 1.00 0.44 0.23
0 0 0
N.D. 0.40
N.D. 0.37
0
0.13 1.57 1.93
0.49 1.37 6.17
0.81 0 0
0.81
0.91
0
yyC 000009846
TABLE II
LABORATORY STUDY COMPARISON VINYL CHLORIDE AND ETHYLENE DICHLORIDE STANDARDS
3M #3500 AND #3520 BADGES
Time Samples
#3500
Sinqle 360 666,271
VCM AREA
#3520
Front 527,397
Back 159,806
Correct Total
879,470
Ws/ Wp
.30
#3500
Single 75,307
EDC AREA
#3520
Front
Corrected Ws/
Back Total
Up
72,628
0 72,628
0
240
530,436
442,349
71,324
599,262
.16
55,654
51.749
0 51,749
0
125 27,990
120
257,706
241,421
23,974
294,163
.10 26,302
24,638
60 134,303
13,540
24,638
0
vvc 000009847
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