Sodium sulfide in water include dissolved H₂S, HS⁻, S²⁻, as well as acid-soluble metal sulfides present in suspended solids, and undissociated inorganic and organic sulfides. Water containing sulfides often appears black and has a pungent odor, primarily due to the continuous release of H₂S gas. Humans can detect hydrogen sulfide in the air at concentrations as low as 8 μg/m³, while the threshold for H₂S in water is 0.035 μg/L.Sodium sulfide.

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