Table 9.
Priority ranking of contamination in the ponds and identified elements of concern based upon Igeo, RI and RCR
| Pond | Rank sum-Igeo1 | Rank RI2 |
Rank sum-RCR3 |
Rank4 | Igeo5 | Mean-Er > 406 | Mean-RCR ≥ 17 |
|---|---|---|---|---|---|---|---|
| Ranking of ponds | Elements of concern | ||||||
| A | 3 (11.8) | 3 (593) | 3 (11.1) | 3 | Ag, S, Sb, Zn | Ag, Cd, Sb | Cu, Sb, V, Zn |
| B | 1 (18.5) | 1 (1248) | 1 (17.3) | 1 | Ag, Cd, Cu, P, Pb, S, Sb, Zn | Ag, Cd, Sb | Ba, Cd8, Co, Cu, Sb, V, Zn |
| C | 5 (1.0) | 4 (134) | 4 (6.3) | 4 | S | None | Co, Ni, V, |
| D | 2 (12.6) | 2 (646) | 2 (12.3) | 2 | Ag, Cd, Cu, S, Sb, Zn | Ag, Cd, Sb | Co, Cu, Sb, V, Zn |
| E | 4 (2.1) | 5 (117) | 5 (3.9) | 5 | S, Sb | Sb | none |
| soil | n.a.9 | n.a | 5.6 | n.a | n.a | n.a | Co, V |
| List elements of concern | Ag, Cd, Cu, (Pb), Sb, Zn | ||||||
1Sum Igeo in parenthesis. When calculating sum Igeo negative Igeo values have been set to 0. Igeo was calculated for all elements except Hg which was below detection limit in all samples. Sum Igeo has been calculated to enable comparison in the risk ranking of the ponds
2Sum Mean Potential Ecological Risk Index in parenthesis. RI was calculated including all elements except Hg, P and S, see also Table 7
3Sum Mean RCR in parenthesis. Sum RCR was calculated for all elements except Hg, P and S, see also Table 8
4Based upon sum of the 3 ranking methods
5Mean Igeo values classified in Class 2 or higher are included. Values in Class 3 or higher in bold
6Mean Er values higher than Class 2 are included. Values in bold are Class 3 or higher, see Table 7
7Mean RCR > 2 in bold
8For one sampling site (B4), the RCR is above 1
9n.a. not applicable. Soil is used in calculation of Igeo and RI