APPENDIX A: DATA AND
SAMPLE CALCULATIONS FOR CHROMIUM
Ta ble A1. Cr concentra tions, ra tios, a nd loga rith ms.
Conce ntra ti ons g/ g
Ra ti os a nd l oga ri th ms
Sa mp l e
QC1
QC1
QC1
QC1
log
log
numbe r
QA
QA
QC2
QC2
QA
QC1
QC2
M1-1
21
3.4
* 0.16
*
M1-2
12
6.2
0.52
0.287
M1-3
8.8
4.6
0.52
0.282
M1-4
18
8.3
0.46
0.336
M1-5
26
17.7
0.68
0.167
M1-6
32
15.9
0.50
0.304
M1-7
30
14.2
0.47
0.325
M1-8
18
8.3
0.46
0.336
M1-9
34
14.2
0.42
0.379
M1-10
9.2
7.6
0.83
0.083
M1-11
2.6
2.9
1.12
0.047
M1-12
8.0
9.3
1.16
0.065
M1-13
33
17.5
0.53
0.275
M1-14
10
19
1.90
0.279
M1-15
18
13.1
0.73
0.138
M1-16
14
22.7
1.62
0.210
M1-17
2800
38.3
* 0.014
*
M1-18
J19
18.6
0.98
0.009
M1-19
J13
15.4
1.18
0.074
M1-20
J18
28.4
1.58
0.198
M1-21
J16
25.9
1.62
0.209
M1-22
14
16.9
1.21
0.082
M1-23
J17
30.5
1.79
0.254
M1-24
12
12.6
1.05
0.021
M1-25
27.8
34
1.22
0.087
M1-26
22
24
1.09
0.038
M1-27
11
7
0.64
0.196
M1-28
15
10.6
0.71
0.151
M1-29
16
14.4
0.90
0.046
M1-30
11
5.8
0.53
0.278
M1-31
17
4.8
* 0.28
*
M1-32
10
8.2
0.82
0.086
M1-33
16
8.2
0.51
0.290
M1-34
9.9
6.2
0.63
0.203
M1-35
12
10.8
0.90
0.046
M1-36
14
7.9
0.56
0.249
M1-37
18
15.5
0.86
0.065
M1-38
12
15.2
1.27
0.103
M1-39
15
12.8
0.85
0.069
M1-40
12
13
1.08
0.035
Conti nue d
22
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