ASTM standards are living documents. They are reviewed periodically (often every 5 to 8 years) and revised to reflect new technology, safety protocols, or precision data.
: Typically 1.0 gram (though some variations use up to 20-30g for lower concentrations). astm d4373 pdf free download
: The current active version is ASTM D4373-21 , which superseded previous versions like D4373-14 and D4373-02. Summary of the Test Procedure ASTM standards are living documents