8 Colo. Code Regs. § 1202-4, pt. 7.0
Current through Register Vol. 48, No. 1, January 10, 2025
7.1 Fertilizer 7.1.1 Any product distributed as a fertilizer that contains guaranteed amounts of phosphates and/or micronutrients shall be deemed adulterated if it contains one or more metals in amounts greater than the levels of metals established by the following table: Metals | ppm per 1% P2O5 | ppm per 1% Micronutrients1 |
1. Arsenic | 13 | 112 |
2. Cadmium | 10 | 83 |
3. Cobalt | 1362 | 22282 |
4. Lead | 61 | 463 |
5. Mercury | 1 | 6 |
6. Molybdenum | 42 | 3002 |
7. Nickel | 250 | 1,900 |
8. Selenium | 26 | 180 |
9. Zinc | 420 | 2,9002 |
1 Micro-nutrients include secondary and micro plant nutrients. Secondary plant nutrients are calcium, magnesium, and sulfur. Micro plant nutrients are boron, chlorine, cobalt, copper, iron, manganese, molybdenum, nickel, sodium, and zinc.
2 Only applies when not guaranteed.
7.1.2 To use the above table:7.1.2.1 First: 7.1.2.1.1 For fertilizers with a phosphate guarantee but no micro-nutrient guarantee, multiply the percent guaranteed P2O5 in the product by the values in the table to obtain the maximum allowable concentration of each metal. The minimum value for P2O5 utilized as a multiplier shall be 6.0.7.1.2.1.2 For fertilizers with one or more micro-nutrient guarantees but no phosphate guarantee, multiply the sum of the guaranteed percentages of all micro-nutrients in the product by the value in the appropriate column in the Table to obtain the maximum allowable concentration (ppm) of each metal. The minimum value for micro-nutrients utilized as a multiplier shall be 1.7.1.2.1.3 For fertilizers with both a phosphate and a micro-nutrient guarantee, multiply the guaranteed percent P2O5 by the value in the appropriate column. The minimum value for P2O5 utilized as a multiplier shall be 6.0.7.1.2.2 Then multiply the sum of the guaranteed percentages of the micro-nutrients by the value in the appropriate column. The minimum value for micro-nutrients utilized as a multiplier shall be 1.7.1.2.3 Utilize the higher of the two resulting values as the maximum allowable concentration (ppm) of each metal.7.2 Compost 7.2.1 Any product labeled and distributed as compost will be deemed adulterated if it contains one or more metals in amounts greater than the levels of metals established by the following table: Metals | Maximum level mg/kg dry weight basis |
Arsenic | 41 |
Cadmium | 39 |
Copper | 1500 |
Lead | 300 |
Mercury | 17 |
Nickel | 420 |
Selenium | 100 |
Zinc | 2800 |
7.2.2 Any product labeled and distributed as compost will be deemed adulterated if it contains a pathogen concentration greater than either of the following levels: 7.2.2.1 Fecal coliform in an amount greater than 1000 most probable number per gram of total solids (dry weight basis); or7.2.2.2 Salmonella sp. bacteria in an amount greater than three (3) most probable number per four (4) grams of total solids (dry weight basis).40 CR 05, March 10, 2017, effective 3/30/201740 CR 23, December 10, 2017, effective 12/30/201743 CR 22, November 25, 2020, effective 12/15/202045 CR 13, July 10, 2022, effective 7/30/2022