Phmeter calibration amd maintenance

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EPA/OPP MICROBIOLOGY LABORATORY ESC, Ft. Meade, MD Standard Operating Procedure for Calibration and Maintenance of pH Meters SOP Number: EQ-01-04 Date Revised: 08-03-05

Initiated By:

_______________________________________ Date: ___/___/___ Print Name:_____________________________

Technical Review:

______________________________________ Date: ___/___/___ PrintName:______________________________ Technical Staff

QA Review:

_______________________________________ Date: ___/___/___ Print Name:_____________________________ QA Officer

Approved By:

_______________________________________ Date: ___/___/___ Print Name:_____________________________ Branch Chief

Effective Date:

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Controlled Copy No.: ___________________

Withdrawn By:______________________________________Date: ___/___/___

SOP No. EQ-01-04 Date Revised 08-03-05 Page 1 of 12

TABLE OF CONTENTS Contents Page Number

1.0 SCOPE AND APPLICATION..............................................................2 2.0 DEFINITIONS.......................................................................................2 3.0 HEALTH ANDSAFETY......................................................................2 4.0 CAUTIONS...........................................................................................2 5.0 INTERFERENCES................................................................................3 6.0 PERSONNEL QUALIFICATIONS.......................................................3 7.0 SPECIAL APPARATUS AND MATERIALS......................................3 8.0INSTRUMENT OR METHOD CALIBRATION.................................4 9.0 SAMPLE HANDLING AND STORAGE.............................................4 10.0 PROCEDURE AND ANALYSIS..........................................................5 11.0 DATA ANALYSIS/CALCULATIONS.................................................10 12.0 DATA MANAGEMENT/RECORDS MANAGEMENT......................10 13.0 QUALITYCONTROL...........................................................................11 14.0 NONCONFORMANCE AND CORRECTIVE ACTION.....................11 15.0 REFERENCES.......................................................................................11 16.0 FORMS AND DATA SHEETS.............................................................11

SOP No. EQ-01-04 Date Revised 08-03-05 Page 2 of 12 1.0 SCOPE ANDAPPLICATION: 1.1 2.0 This protocol describes the method for the operation, two point calibration, and maintenance of the Corning pH meter 430 and the Corning pH meter 530.

DEFINITIONS: 2.1 A two-point calibration involves calibrating the pH meter with two different buffers of known pH and then checking the pH meter against a pH 7.00 standard buffer to confirm the calibration. Ceramic Junction =Holds the fill solution in the electrode. The junction is designed to allow the fill solution to leak out of the tip of the electrode at a slow controlled rate. Fill Hole Plug = Small circular hole on the side of the electrode that is covered by a rubber stopper when not in use. The fill whole plug is removed during calibration and maintenance of the electrode or when fill solution (KCL) is beingadded to the inside of the electrode. Fill Solution = Acts as an electrical conductor between the reference inside the electrode and the solution under test. Wetting Cap = The cap that covers and protects the tip of the electrode. The wetting cap should stay on the tip of the electrode during periods of non use.

2.2

2.3

2.4 2.5 3.0

HEALTH AND SAFETY: 3.1 Personal protective equipmentincluding safety glasses and lab coats should be used.

4.0

CAUTIONS: 4.1 4.2 4.3 Do not allow fill solution to run dry. Add fill solution whenever the level falls more than 25 mm below the fill hole. Replace solution at least once a month. Always remove the wetting cap and the fill hole plug during calibration and measurements. Replace the fill hole plug in between use. Do not leave the...
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