If your lab is accredited to ISO 17025 (General requirements for the competence of testing and calibration laboratories), implementing ASTM E70 requires:
No, but they are technically equivalent. If you test internationally, check which your client requires. astm e70 pdf
: A sensitive electrode that responds to hydrogen ion activity. Reference Electrode : Typically a saturated calomel or 3.5 M calomel electrode. Standard Buffer Solutions Essential for calibration and checking electrode response. If your lab is accredited to ISO 17025
: The method is precise even in solutions with high electrolyte concentrations or water-soluble organic compounds. Where to Find the Official PDF Reference Electrode : Typically a saturated calomel or 3
Measure successive portions of the test solution until results for two successive portions agree within 0.02 units (for well-buffered solutions). Report the final pH value to the nearest and the temperature of the solution to the nearest Standard Availability and Updates The most recent version is ASTM E70-24 , which you can access via the ASTM International website . Previous versions like E70-07(2015) remain widely referenced in historical data. ASTM International checklist template