This was probably due to increased precipitation of the sulfide with iron.
We are studying microbes in hydrothermal environments that obtain metabolic energy from mineral substrates, particularly metal sulfides.
When acetic acid was poured over the produce ("liver of sulfur," which contains mostly potassium sulfide), sulfur precipitated due to an oxidation of the sulfide.
A moment of the iron sulfide nodule is 100 times stronger than black shale.
In addition, hydrogen sulfide can be released from the waste water, potentially resulting in a hydrogen sulfide build-up in the sewer atmosphere.
The easily worked oxidised ore was largely depleted and the underlying sulfide deposits were proving difficult and costly to treat.
A lot is known on the molecular mechanisms of amino acids on oxides and silicate minerals (and very little on sulfide minerals).
None of the sulfide ions make any favorable hydrogen bond to the protein.
