Section 25, The National Fertilizer Regulations, 2020.

(1) The maximum allowable heavy metal limits in fertilizerproducts shall be determined based on the following table - Heavy Multiplier Tolerance Metal ppm per % ppm per % milligrams per p2 o5 micro nutrients kilogram of biosolids or compost productdry- weight basis Arsenic (As) 13 112 75 Cadmium (Cd) 10 83 85 Cobalt (Co) 136 2,228(a) - Copper (Cu) - - 4,300 Lead (Pb) 61 463 840 Mercury (Hg) 1 6 57 Molybdenum (Mo) 42 300(a) 75 Nickel (Ni) 250 1,900 420 Selenium (Se) 26 180 100 Zinc (Zn) 420 2,900(a) 7,500 * Shall be used only when the percentage of that particular micronutrient is not specified or guaranteed in the FERTILIZER label. 22 23 Minimum percentage of nutrients claimable. Plant guarantee. Maximum allowable heavy metal limits. (2) For a fertilizer product with P205 guarantee and no micronutrient guarantee - (a) for each heavy metal, its maximum allowable concentration (ppm) in that product shall be determined by multiplying the percent guaranteed P205 of the product by the appropriate factor of that heavy metal in column 2 in the table in sub-regulation (1). (b) where the percent guaranteed P205 of the product is less than 6.0, then the multiplier shall be 6.0. (3) For a fertilizer product with micronutrients guarantee and noP205 guarantee - (a) For each heavy metal, its maximum allowable concentration (ppm) in that product shall be determined by multiplying the sum of the guaranteed percentages of all micronutrients in the product by the appropriate factor of that heavy metal in column 3 in the table in sub- regulation (1). (b) where the sum of the guaranteed percentages of all micronutrients in the Product is less than 1.0 then the multiplier shall be 1.0. (4) For a fertilizer product with both micronutrients and P205 guarantee, for each heavy metal, carry out separately the computation outlined in sub-regulations (2) and (3), and the maximum allowable concentration (ppm) of the heavy metal under consideration shall be the higher of the two resulting values. (5) For a bio solid or compost product, the maximum allowable concentration of each heavy metal shall be the appropriate value of that heavy metal in column 4 of the table in sub-regulation (1).