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Maximum Permissible Concentrations of Potentially Toxic Elements (PTE) in Soil after Application of Sewage Sludge to Agricultural Land & Annual Rates of Addition

(Figures from Sewage Sludge on Farmland: Code of Practice)

PTE limits for arable soil

Potentially toxic elements (PTE) Maximum permissible concentration of PTE in soil (mg/kg dry solids) Maximum permissible average annual rate of PTE addition over 10 years (kg/ha)
pH
5.0-5.5 5.5-6.0 6.0-7.0 >7.0
Zinc 200 200 200 300 15
Copper 80 100 135 200 7.5
Nickel 50 60 75 110 3
  For pH >5.0  
Cadmium 3 0.15
Lead 300 15
Mercury 1 0.1
Chromium 400 15
Molybdenum 4 0.2
Selenium 3 0.15
Arsenic 50 0.7
Fluoride 500 20

PTE limits for grassland

Potentially toxic elements (PTE) Maximum permissible concentration of PTE in soil (mg/kg dry solids)
pH
5.0-5.5 5.5-6.0 6.0-7.0 >7.0
Zinc 200 200 200 300
Copper 130 170 225 330
Nickel 80 100 125 180
  For pH >5.0
Cadmium 3
Lead 300
Mercury 1.5
Chromium 600
Molybdenum 4
Selenium 5
Arsenic 50
Fluoride 500
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