1. n. [Drilling Fluids]

A chemical used as a titrant with potassium chromate as the endpoint indicator for a chloride test, a titration procedure standardized by the API to quantitatively determine Cl^– (chloride ion) concentration.

See: chromate salt,  dissolved solids,  filtrate,  make-up water,  meniscus,  normality,  oil mud,  oil/brine ratio,  potassium ion,  retort solids,  saltwater mud,  seawater mud,  synthetic/brine ratio,  water, oil, and solids test