Table A6. Sixth VOC study--Effect of oven drying time.
Analyte conc. (mg/L) in controls
MNT
TCE
PDCB
PCE
A
2.19
1.70
1.34
1.47
B
2.20
1.66
1.33
1.44
C
2.19
1.66
1.32
1.41
2.19
1.67
1.33
1.44
X
% RSD
0.26
1.4
0.75
2.1
Analyte conc. (mg/L) after PTFE
Analyte conc. (mg/L) after PTFE
sorbed for 24 hr
sorbed for 7 days
MNT
TCE
PDCB
PCE
MNT
TCE
PDCB
PCE
A
2.16
1.38
0.95
0.87
2.10
0.80
0.52
0.33
B
2.16
1.40
0.95
0.88
2.13
0.80
0.55
0.34
C
2.15
1.36
0.94
0.86
2.15
0.81
0.53
0.34
2.16
1.38
0.94
0.87
2.13
0.80
0.53
0.34
X
% RSD
0.27
1.4
0.61
1.1
1.2
0.72
2.9
1.7
% of initial
98
82
71
60
97
48
40
23
Desorbed conc. (mg/L) after
Desorbed conc. (mg/L) after
oven (105C) drying
oven (105C) drying
Time in oven
(hr)
MNT
TCE
PDCB
PCE
MNT
TCE
PDCB
PCE
0
0.014
0.093
0.102
0.114
0.022
0.097
0.118
0.106
0
0.014
0.093
0.105
0.126
0.024
0.097
0.109
0.103
0
0.014
0.089
0.096
0.116
0.026
0.109
0.112
0.116
0.014
0.092
0.101
0.119
0.024
0.101
0.113
0.108
X
% RSD
0
2.5
4.5
5.4
8.3
6.9
4.1
6.3
% of initial
0.6
5.5
7.6
8.2
1.1
6.0
8.5
7.5
1
LD
0.005
LD
0.010
0.006
0.019
LD
LD
1
LD
0.004
LD
LD
LD
0.018
LD
0.011
1
LD
0.005
LD
LD
0.006
0.016
LD
LD
LD
0.005
LD
LD
<0.004
0.018
LD
<0.010
X
% RSD
12
8.3
% of initial
--
0.3
--
--
--
1.1
--
--
4
LD
LD
LD
LD
LD
LD
LD
LD
4
LD
LD
LD
LD
LD
LD
LD
LD
4
LD
LD
LD
LD
LD
LD
LD
LD
LD
LD
LD
LD
LD
LD
LD
LD
X
MDL
0.001
0.003
0.008
0.009
LD = less than detection limit.
22
Previous Page
