ACGIH
OSHA
OSHA – Manganese Sampling Information Page
Metal & Metalloid Particulates in Workplace Atmospheres (Atomic Absorption) (.pdf)
Some states have more stringent requirements than the standard OSHA regulations. To find out if your state falls into this category, click here.
AWS
AWS Safety and Health Fact Sheets
AWS Z49.1: Safety in Welding, Cutting and Allied Processes (.pdf)