Regulations last checked for updates: Nov 25, 2024

Title 40 - Protection of Environment last revised: Nov 21, 2024
Appendix - Table Z-1 to Subpart Z of Part 98—Default Chemical Composition of Phosphate Rock by Origin
Origin Total carbon
(percent by weight)
Central Florida1.6
North Florida1.76
North Carolina (Calcined)0.76
Idaho (Calcined)0.60
Morocco1.56
source: 74 FR 56374, Oct. 30, 2009, unless otherwise noted.