inert sulfide

X-Y plot of sulfide ion species
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1. n. [Drilling Fluids]
A stable compound of sulfur that contains the S-2 ion. Sulfides can be generated from soluble iron sulfide minerals or from sulfate-reducing bacteria. Active sulfides, which revert to H2S gas when acidified and consequently pose a potential danger, may be converted to inert sulfides by adding zinc oxide.

Reference: Garrett RL, Carlton LA and Denekas MO: "Methods for Field Monitoring of Oil-Based Drilling Fluids for Hydrogen Sulfide and Water Intrusions," SPE Drilling Engineering 3, no.3 (September 1988): 296-302.