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total hardness test

1. n. [Drilling Fluids]

A chemical analysis to measure the hardness ions in water-mud filtrates or in make-up water. Hardness is quantitatively determined by titration using standardized EDTA (versenate) reagent and ammonium hydroxide (weak) buffer, typically according to procedures of API. Results are reported as calcium ion in mg/L. The hardness ion Ca+2 can be analyzed alone by another EDTA titration method described by the API.

See: buffercalcium testEDTAendpointfiltratehard waterhardness ionmagnesium testmake-up watertitration

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