| | |
S2O32-/μM
|
SCN-/μM
|
|---|
|
Sample
|
Treatment
|
Field, 8/23/95
|
Lab, 9/21/95
|
Lab, 7/20/96
|
Field, 8/23/95
|
Lab, 9/21/95
|
Lab, 7/20/96
|
|---|
|
S2O3
|
Standarda
|
46.5
|
46.7
|
42.9
| | | |
|
S2O3
|
Standarda
|
21.2
|
20.6
|
19.0
| | | |
|
SCN
|
Standard
| | | |
9.2
|
9.5
|
9.3
|
|
SCN
|
Standard
| | | |
3.5
|
3.6
|
3.7
|
|
CD-2
|
None
|
45.0
|
17.1
|
6.2
| | | |
|
CD-2
|
ZnCl2
|
45.5
|
50.4
|
53.3
| | | |
|
CD-2
|
KCN
|
53.2
|
52.0
|
60.3
|
11.1
|
14.1
|
19.9
|
|
CD-3
|
None
|
43.5
|
11.7
|
10.4
| | | |
|
CD-3
|
ZnCl2
|
43.8
|
48.2
|
50.0
| | | |
|
CD-3
|
KCN
|
48.9
|
52.1
|
51.9
|
5.7
|
12.5
|
11.4
|
|
CD-4
|
None
|
42.9
|
16.19
|
7.6
| | | |
|
CD-4
|
ZnCl2
|
42.8
|
46.1
|
48.3
| | | |
|
CD-4
|
KCN
|
45.5
|
48.3
|
52.4
|
4.1
|
11.5
|
12.1
|
- aThiosulfate standards have pH > 7. In the field KCN was added to the samples to convert polythionates to SCN- using cyanolysis.74 Hence, this test pertains to the stability of SCN- over time as a measure of polythionate concentration and the formation of additional polythionate over time, which would be converted to SCN- in the bottle.
