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H2S (hydrogen sulfide) of water

H2S (hydrogen sulfide) is a toxic gas. It is formed in anaerobic conditions.

In water, H2S (gas) exists in equilibrium with the hydrosulfide ion (HS-). If the pH is low, H2S will exist in the form of toxic gas.

For example, at 24 degrees Celsius, if the pH value is at 5, then 99.1% hydrogen sulfide is in the form of H2S (toxic gas) while the remaining is in the hydrosulfide ion (HS-) form that is not toxic. If the pH level is at 8, only 8% of hydrogen sulfide is in the form of H2S (toxic gas).

The presence of H2S (gas) in a continuous period will reduce shrimp and fish reproduction although it appears in a very small amount of 0.001 ppm.

H2S concentration in shrimp ponds should be less than 0.01 mg/L.

H2S can be eliminated from ponds by the use of aeration or KMnO4 (potassium permanganate) to oxidize hydrogen sulfide into non-toxic sulfur compounds

Image: Sulfide intrusion in seagrasses assessed by stable sulfur isotopes - a synthesis of current results

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