Sentences with phrase «when iron ions»
Dissolved hydrogen sulphide, H2S (aq), then penetrates the wood, where it is transformed into solid reduced sulphur compounds, such as thiols, R - SH (R denotes an organic part), in the lignin of the wood and to iron (II) sulphides when iron ions are available.
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On the seabed, dissolved iron (II) ions have combined with the hydrogen sulphide to form iron sulphides, for example pyrite, FeS2, which is unstable when the moist wood is exposed to oxygen: FeS2 (s) + 7 / 2O2 + (n +1) H2O → FeSO4 · n (H2O)(s) + H2SO4 (aq)
When that happens, the iron (Fe) loses electrons (becoming the Fe +3 ion) and oxygen picks them up.