Table 5 Comparison of maximum and actual concentrations of trace elements (mg kg−1) in dry wood ash [32, 71], unpublished results] in Nordic countries and Lithuania
Country | Denmark | Finland | Sweden | Lithuania | Lithuania |
|---|---|---|---|---|---|
Application | Agriculture/Forestry | Agriculture/Forestry | Forestry | - | Agriculture/Forestry |
Status | Legislation, 2006 | Legislation, 2007 | Recommendations, 2007 | Agrochemical Research Lab, LAMMC* | Regulations for wood ash disposal and use |
Arsenic (As) | - | 25/30 | 30 | ~ 4 | 3 |
Cadmium (Cd) | 5/15 | 15/17.5 | 30 | 9-11 | 5/3 |
Chromium (Cr) | 100 | 300 | 100 | - | 30/20 |
Copper (Cu) | - | 600/700 | 400 | 200-250 | 200/100 |
Mercury (Hg) | 0.8 | 1.0 | 3 | < 0.5 | 0.2 |
Nickel (Ni) | 30/60 | 100/150 | 70 | 30-35 | 30/20 |
Lead (Pb) | 120 | 100/150 | 300 | ~ 60 | 50/40 |
Zinc (Zn) | - | 1500/4500 | 1000-7000 | 2500-3500 | 1500/1000 |
References | [71] | [71] | [71] | Unpubl. | [32] |