When using Method 8007 for phosphonates, why is a 1 mg/L PO4 standard solution reading 10 mg/L PO4?

Document ID

Document ID TE362

Version

Version 3.0

Status

Status Published

Published Date

Published Date 07/31/2018
Question
When using Method 8007 for phosphonates, why is a 1 mg/L PO4 standard solution reading 10 mg/L PO4?
Summary
Accuracy check for phosphonates
Answer
In the Accuracy Check section of Method 8007 for the phosphonate determineation, a 1 mg/L phosphate standard solution (Product # 256949) is recommended to check the instrument calibration. Digestion is not necessary for this verification, and the standard does not need to be diluted. Because the standard does not require digesting or diluting, 10 mL of standard should be used. The displayed result will be 10 times higher than the standard concentration because a factor of 10 is programmed into the instrument calibration. This factor allows the range of the test to be extended up to 125 mg/L.

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