Are there suggestions to avoid contamination in phosphate testing?

Document ID

Document ID TE371

Version

Version 4.0

Status

Status Published

Published Date

Published Date 08/09/2018
Question
Are there suggestions to avoid contamination in phosphate testing?
Summary
Sample phosphate results are high, but the Hach standard runs correctly
Answer
Phosphate contamination can cause results to be unexpectedly high. This is most commonly caused by the detergent that is being used to clean lab glassware. Most detergents contain phosphate, which will adhere to the sides of glassware and can add a significant amount of phosphate to the test. Containers used for sample collection, storage and testing that have suspected contamination should be washed with a 1:1 HCl solution. Phosphate free detergents such as Liqui-nox (Product # 2088117 and 2088153) should be used for cleaning glassware.

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