Are there standards to verify the accuracy of a hardness method?

Document ID

Document ID TE288

Published Date

Published Date 27/05/2017
Question
Are there standards to verify the accuracy of a hardness method?
Summary
Verifying the accuracy of a hardness method
Answer
Hach procedures will detail the use of a primary standard solution in the Accuracy Check Section.

-Hardness Standard Solution, 0.50 mg/L as CaCO3 (NIST), 946 mL, catalog number 2058016
-Hardness Standard Solution, 2.00 mg/L as CaCO3 (NIST), 946 mL, catalog number 2058116
-Calcium Hardness Standard Solution, 10,000 mg/L as CaCO3 (NIST), 16/pk-10-mL Voluette Ampules, catalog number 218710
-Hardness Quality Control Standard, Low Range - Total Hardness: 100 mg/L as CaCO3, Calcium Hardness: 50 mg/L as CaCO3, 500 mL, catalog number 2833449
-Hardness Quality Control Standard, High Range - Total Hardness: 1,000 mg/L as CaCO3, Calcium Hardness: 500 mg/L as CaCO3, 500 mL, catalog number 2833349
-Magnesium Standard Solution, 1,000 mg/L as Mg (NIST), 100 mL, catalog number 1479442