Are the HQd and the sensION+™ Meters/Probes EPA approved for reporting pH?

Document ID

Document ID TE3095

Version

Version 3.0

Status

Status Published

Published Date

Published Date 07/05/2018
Question
Are the HQd and the sensION+™ Meters/Probes EPA approved for reporting pH?
Summary
HQd and sensION+™ meters/probes EPA approval for pH
Answer
The EPA does not approve instrumentation, but does approve the methodology the instrument utilizes.

When electrochemical pH measurements using HQd series (or sensION+™ meters) meters/electrodes are performed in accordance with specific 'official' methods, the results can be reported.

The EPA does stipulate methods that must be used in conjunction with instruments, in order to be in compliance with regulations.  The HQd meters (and sensION+™ meters) have features that allow the user to follow regulatory methods. For example, slope is corrected for temperature, auto-buffer recognition and temperature correction of buffer values are used during calibrations, multiple point calibrations can be performed, etc.

The specific analytical methods to be followed are contained in the CFR for NPDES (Wastewater) and NPDWR purposes.  These methods appear in 40CFR Part 136, Section 136.3, Table 1b; and, 40CFR Part 141, Section 141.23 respectively.

For NPDES (Wastewater), the HQd meters (and sensION+™ meters) support the following methods:

• Standard Method:  4500-H+ B
• ASTM Method: D1293-84(90)/(A or B)
• EPA Method: 150.1
• USGS Method: I-1586-85
• AOAC Method: 973.41

For NPDWR (Drinking water), the HQd meters (and sensION+™ meters) support the following methods:

• Standard Method:  4500-H+ B
• ASTM Method: D1293-95
• EPA Methods: 150.1, 150.2

ANY QUESTIONS ABOUT ACCEPTABILITY SHOULD BE ADDRESSED WITH YOUR REGULATOR PRIOR TO REPORTING RESULTS.

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