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Analysis Report for Determination of pH Correction Factors for Brines under AP-157 Rev.1

Kirkes, Leslie D.; Jang, Jay J.; Hora, Priya I.; Miller, Chammi S.; Zhang, Luzheng Z.; Jackson, Ryan S.; Arnold, Randall L.; Nielsen, Shelly R.; Triventi, Antonio T.

This Analysis Report (AR) documents the determination of pH correction factors for the observed pH readings. The correction factor converts the observed pH reading recorded from the brines used in geochemical studies in support of the Waste Isolation Pilot Plant (WIPP) to a corrected pH value. The data analysis in this AR falls under AP-157 Rev. 1 Analysis Plan for Determination of pH Correction Factors in Brines (Kirkes et al, 2021). Measurement of pH in some solutions can be challenging due to numerous factors such as high ionic strength, elevated or lowered temperature, complex matrix composition, etc. (Knauss et al., 1990; and Rai et al., 1995). The measured pH can be corrected by applying the correction factor, empirically obtained from a specific test solution.