Is there any guidance offered for meeting the QC criteria in Hach methods?

Document ID

Document ID TE6749

Published Date

Published Date 11/13/2018
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Question
Is there any guidance offered for meeting the QC criteria in Hach methods?
Summary
QC requirements for Hach published methods
 
Answer
A clean water act rule was published on 8/28/2017 to clarify this.
 
From the federal register:
 
For clarification purposes, the following two lines have been added to the methods modification paragraph (b):
 
Where the laboratory is using a vendor-supplied method, it is the QC criteria in the reference method, not the vendor’s method that must be met to show equivalency.
 
Where a sample preparation step is required ( i.e., digestion, distillation), QC tests are to be run using standards treated in the same way as samples.

Federal Register 8/28/2017

 

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