1. n. [Drilling Fluids]
An acidic salt, ZnCl2, used as one of the standard saturated salt solutions for calibration of the electrohygrometer. Saturated zinc chloride solution at room temperature has 10% relative humidity. Zinc chloride can be used to scavenge sulfides from a mud system in cases where the addition of a chloride salt will not cause detrimental effects on mud performance, such as in a saltwater mud.
See: activity of aqueous solutions, Garrett Gas Train, humidity, hygrometer, sulfide, zinc basic carbonate, zinc bromide, zinc carbonate, zinc oxide
