40 C.F.R. Appendix IV to Part 257
Constituents for Assessment Monitoring
Cite as 40 C.F.R. Appendix IV to Part 257 (2026)
Common name 1 Antimony Arsenic Barium Beryllium Cadmium Chromium Cobalt Fluoride Lead Lithium Mercury Molybdenum Selenium Thallium Radium 226 and 228 combined 1 Common names are those widely used in government regulations, scientific publications, and commerce; synonyms exist for many chemicals. [80 FR 21500, Apr. 17, 2015]