Cotter Corporation (N.S.L.)
Cañon City Milling Facility
Cañon City, Colorado
Procedure
Oxidation Reduction
Potential Measurements
Number: E-046
Page 2 of 6
Revision: 1
Date: --/--/--
1.0
PURPOSE
This procedure describes the activities necessary for measuring the Oxidation-reduction
potential (ORP) in unfiltered water samples during water quality monitoring activities at
the Cotter Corporation (N.S.L.) (“Cotter”), Canon City Milling Facility.
2.0
SCOPE
This procedure applies to oxidation-reduction potential (ORP) measurements within a
millivolt range of +/- 1999.9 mV in water samples taken for water quality measurements
by Cotter Corporation (N.S.L.), Canon City Milling Facility.
3.0
REFERENCES
3.1
Quality Assurance Project Plan, current version.
3.2
Colorado Radioactive Materials License, current version.
4.0
DEFINITIONS
4.1
Oxidation-reduction potential (ORP) measurements are used to monitor chemical
reactions, quantify ion activity or determine the oxidizing or reducing properties
of solutions. While ORP measurements are somewhat similar to those of pH, the
potential value must be carefully interpreted to achieve meaningful results. The
field measured ORP values are corrected to correlate to Standard Hydrogen
Electrode (SHE).
5.0
APPENDICES
5.1
ORP reference solution offset correction addition factors.
5.2
VWR SympHony SP80PC Meter Instruction and Operating Manual
6.0
EQUIPMENT AND MATERIALS
6.1
EQUIPMENT
6.1.1
VWR SympHony SP80PC Meter or the equivalent.
6.1.1.1
This meter measures millivolts in the range of +/- 1999.9 mV.
6.1.1.2
If the reading exceeds this range, an error message is displayed.
6.1.2
Refillable Platinum combination ORP electrode, or the equivalent
6.2
MATERIALS
Summary of Contents for sympHony
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