30
ERDC/CRREL TR-02-12
Table 8. Metals study summary (concentration in g/L).
Cadmium
Lead
Sampler
Control
Sampler
Control
Sampler
Control
Sampler
Control
Discrete Interval Sampler
54
26.4
27.0
49
49
68
72
Mean
53
1.5
0.61
0.71
1.2
1.5
1.5
1.8
Std. Dev.
1.7
2.8
2.3
2.6
2.5
3.1
2.2
2.5
% RSD
3.1
HydraSleeve
52
26.2
25.1
49
49
68
68
Mean
53
0.55
0.62
0.15
1.5
1.2
1.5
1.3
Std. Dev.
1.5
1.1
2.4
0.6
3.1
2.5
2.2
1.9
% RSD
2.8
Kabis Sampler
53
26.7
26.4
49
48
71
70
Mean
53
0.45
0.62
0.49
2.3
0.71
0.84
1.3
Std. Dev.
0.55
0.8
2.3
1.9
4.8
1.5
1.2
1.9
% RSD
1.0
PneumoBailer
53
27.1
26.4
50
49
70
70
Mean
55
0.89
0.40
0.64
1.2
1.3
0.55
0.89
Std. Dev.
1.1
1.7
1.5
2.4
2.4
2.7
0.8
1.3
% RSD
2.0
Diffusion bag sampler
<2.0
26.0
<2.0
49
2
70
<1.0
Mean
53
0.50
1.4
0.55
0
Std. Dev.
0
1.9
2.9
23
0
% RSD
0
With the HydraSleeve sampler, loss of TCE (11%) was statistically
significant. Given that the sample had to be retrieved from such depth, it seems
reasonable that losses of TCE might be slightly greater in this study than in the
standpipe studies. These losses might possibly have been less if the HydraSleeve
sampler had been left to equilibrate overnight prior to sampling, as recommended
by the manufacturer.
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