La. Admin. Code tit. 51 § XII-1110

Current through Register Vol. 50, No. 11, November 20, 2024

Section XII-1110 - CalibrationpH/Validation of pH Meters

A. pH of water within the water treatment plant shall be conducted using a pH meter having a minimum accuracy of ±0.2 pH units.

B. Benchtop pH meters used for determining the pH of water within the water treatment plant shall be calibrated at least once each day in accordance with Section 4. a. of SM 4500-H⁺ B (Electrometric pH Method) of the Standard Methods for the Examination of Water and Wastewater, 19th Edition, or the manufacturer's specifications.

C. The calibration_pH of benchtop pH meters shall be validated with at least one buffer solution each time a series of samples is run and, if necessary, recalibrated in accord with the requirements of Subsection B of this Section.

D. On-line pH meters shall be calibrated_pH according to the manufacturer's specifications at a frequency such that the deviation observed between calibrations is typically less than ±0.2 pH units. The deviation is to be recorded at each calibration by recording the current process pH both before and after calibration. In no case shall calibrations of on-line pH meters be performed at a frequency of less than once each week.

E. Records of calibrations on each pH meter shall be maintained for at least three years.

La. Admin. Code tit. 51, § XII-1110

Promulgated by the Department of Health and Hospitals, Office of Public Health, LR 30:1195 (June 2004).

AUTHORITY NOTE: Promulgated in accordance with R.S. 40:4(A)(8) and 40:5(5)(6)(17)(20).