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On Tue, 28 Jan 1997 23:38:29 -0800 EE Atikkan wrote:- >Water and hydrogen sulfide R indeed very similar. > >Structurally H2S is similar to H2O > >H--O--H (slightly bent out of shape) vs H--S--H > >because chemically S & O are so similar. (It's all in their electrons 2, 6 vs 2, 8, 6) > >Atomic weights are even in the synchrony - 16 vs 32 (OK so at times the latter can glow in the dark) and, more noteworthy, their nascent forms have the same molecular weight 32 (S vs O2). > >Inorganic formation: > >HCl + NaOH ====> NaCl + H2O > >HAc + Na2S ====> NaAc + H2S >(well actually my chem teach had taught >CaS + MgCl2 + H2O ====> CaCl2 + Mg(OH)2 + H2s) > >Now when H2S comes into contact with water it forms hydrosulfurous acid. (By the same token, water in aqueous media will from hydroaquoreous acid, called aquaeum when very concentrated) > >Organically H2S can be formed by the enzymatic cleavage and transfer of sulfhydryl groups ( -SH) to appropiate protons. > >-SH + H+ -----proto sulfhydryl transferase----> H2S > >Water can be formed by the enzymatic cleavage & transfer of hydroxyl groups, say from phoroglucinol to protoen > >Phorogluconol ------1,3,5 benzene triol dehydroxylase----> Benzene + H20 > >again requiring a proton to capture the OH- moeity. > >The chemical similarity between these compounds is obvious. > > >Though H2S & H20 are so similar, they have vastly different effects on body. > >Human skin is impermeable to H2O. Yet that integument will allow H2S, as hydrosulfurous acid, to permeate. > >H2S reacts with Fe+++, forming Fe2S3, the Au of fools. >Remembering that heme of blood has a Fe moeity, once the body comes into contact with H2S the rx > >Fe+++ + S-- -------> Fe2S3 proceeds rapidly, converting blood to a slurry of fool's Au, shiny, but worthless. > >At the same time H2S in water (1 gr/ca.200 ml) forms: >H2S + H20 ----> S + H20 > >Exposure to H2S will cause conjuctival rx & mucous membrane >inflammation, head ache, dizziness, lasstitude > >Regards > >Esat Atikkan Esat! That's easy for you to say, but ....!!! :-) Regards Strike ----------------------------------------------------------------------------- David Strike Associate Publisher/Editor Professional Diver Journal PO Box 1128 Dee Why NSW 2099 Australia Tel.: +61 (2) 9971 2559 Fax.: +61 (2) 9981 2950 e-mail: strikinc@oz*.co*.au* 'A quarterly publication for Professional, Commercial and Defence Industry Divers' -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send list subscription requests to `techdiver-request@aquanaut.com'.
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