How should the Certificate Of Analysis (COA) for standard solutions be interpreted?

Document ID

Document ID TE3748

Published Date

Published Date 01/29/2019
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Question
How should the Certificate Of Analysis (COA) for standard solutions be interpreted?
Summary
Correct interpretation of a Certificate Of Analysis (COA) for standard solutions
Answer
Users should expect most containers of a standard solution to be at the concentration value labeled in its name. The results of concentration values on standard solutions' Certificates Of Analysis (COA) show that the aliquot of containers selected of that standard solution on the day it was manufactured was shown to pass their manufacturing quality control; the concentration value on the standards solutions' COA should not be interpreted to be the true value of that standard. The following products are the only exceptions to this rule and with them, the concentration published on their COA should be used:
  • Chlorine Standard Solution, 25-30 mg/L as Cl2, pk/20 - 2 mL PourRite Ampules, NIST (Product # 2630020)
  • Chlorine Standard Solution, 50-75 mg/L as Cl2, pk/20 - 2 mL PourRite Ampules, NIST (Product # 1426820)
  • Chlorine Standard Solution, 50-75 mg/L as Cl2, pk/16 - 10 mL Voluette Ampules, NIST (Product # 1426810)
  • Chlorine Dosing Solution Ampules, 1000-1500 mg/L as Cl2, pk/16 (Product # 2504810)
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