Figure 1
A schematic map of points of samples collecting
Figure 2
Structure of a compound used in terminating electrolyte: 4,4’-bis{1-(N-perhydroazepiniomethyl)[spirobi(1-sila-2,5-dioxacyclopentane-3-on)]ate}
Table 1
Characteristic of elaborated analytical method
| Parameter | Unit | In conversion to Hg |
|---|---|---|
| Precision1 | % | 4.7 |
| Recovery2 | % | 93 ± 4 |
| Linearity3 | μg/dm3 | 0.15–10.0 |
| Limit of detection4 | μg/dm3 | 0.03 |
| Limit of quantification5 | μg/dm3 | 0.10 |
[i] 1 – n = 5, the samples were analysed twice
2 – the sample was enriched with 1.5 cm3 of a solution containing 1 mg/cm3 [HgI4]2-, n = 5
3 – correlation coefficient above 0.9987
4 – calculated from the limit of identification and coefficients of the calibration curve
5– LOQ = 3 x LOD
Table 2
Average mercury content [μg/dm3] in the tested snow samples (n = 5)
| Sampling point marked on the map | December Min–Max (average) | SD, % | January Min–Max (average) | SD, % | February Min–Max (average) | SD, % |
|---|---|---|---|---|---|---|
| 1 (housing development Topolowa) | 0.27–0.35 (0.32) | 3.8 | 0.22–0.29 (0.25) | 2.9 | 0.26–0.36 (0.32) | 4.5 |
| 2 (housing development Nowe Siedlce) | 0.23–0.28 (0.26) | 1.9 | 0.20–0.28 (0.25) | 3.2 | 0.22–0.35 (0.34) | 4.7 |
| 3 (housing development Żwirowa) | 0.30–0.39 (0.35) | 3.3 | 0.33–0.38 (0.36) | 1.9 | 0.29–0.38 (0.34) | 3.4 |
| 4 (housing development Nad Zalewem) | 0.25–0.33 (0.28) | 3.4 | 0.21–0.32 (0.27) | 4.3 | 0.23–0.33 (0.28) | 4.0 |
[i] SD – standard deviation