Table 5 |
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|
Results from the analytical quality control |
||||||
| Concentrations found |
||||||
|
|
||||||
| Material |
Analyte a |
Mean |
SD |
N |
Method |
Recommended (or certified) values |
|
|
||||||
| LUTS-1; ng/g |
T-Hg |
16.1 |
- |
1 |
CVAFS |
19.98 (0.20) b |
| I-Hg |
14.1 |
- |
1 |
CVAFS |
- |
|
| MeHg d |
2.0 |
- |
1 |
CVAFS |
2.50 (0.21) b |
|
| LUTS-1; ng/g |
MeHg d |
2.7 |
- |
1 |
GC-ICPMS |
2.50 (0.21) b |
| Seronorm 404107X; μg/L |
T-Hg |
2.5 |
0.14 |
3 |
CVAFS |
3 (2.2–3.3) c |
| I-Hg |
0.5 |
0.03 |
3 |
CVAFS |
- |
|
| MeHg d |
2.0 |
0.13 |
3 |
CVAFS |
- |
|
| Seronorm 404108; μg/L |
T-Hg |
8.5 |
0.74 |
4 |
CVAFS |
8 (6.7–8.4) c |
| I-Hg |
6.3 |
0.18 |
4 |
CVAFS |
- |
|
| MeHg d |
2.2 |
0.68 |
4 |
CVAFS |
- |
|
| LUTS-1; ng/g |
T-Hg |
19.9 |
1.19 |
12 |
ICP-SFMS |
19.98 (0.20) b |
| SRM 8414; ng/g |
T-Hg |
5.5 |
0.63 |
8 |
ICP-SFMS |
5 ± 3e |
| SRM 1577a; ng/g |
T-Hg |
3.6 |
0.51 |
8 |
ICP-SFMS |
4 ± 2e |
|
|
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|
a) T-Hg: Total mercury concentration; I-Hg: Inorganic mercury concentration; MeHg: Methylmercury concentration b) Mean and one standard deviation, n = 4 for Hg and n = 5 for MeHg (Revised value by February 14, 2005; written personal communication, Dr. Ralph Sturgeon, National Research Council of Canada/Institute for National Measurement Standards). Values from the certificate, revised in August 1995, were 16.7 for T-Hg and 9.4 for MeHg with 95 percent confidence limits of 2.2 and 0.6, respectively. c) Recommended value (range) d) as Hg e) Estimated uncertainties |
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|
Björkman et al. Environmental Health 2007 6:30 doi:10.1186/1476-069X-6-30 |
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