Registration Dossier
Registration Dossier
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EC number: 231-639-5 | CAS number: 7664-93-9
Endpoint summary
Administrative data
Description of key information
Sulphuric acid is a strong mineral acid (pKa = 1.92) that dissociates readily in water to hydrogen ions and sulphate ions. At environmentally relevant pH levels, the acid is totally dissociated and is totally miscible with water. The hydrogen ions, although not degraded as such due to their elemental nature, will react with any source of alkalinity to produce water. The net acid balance will impact the pH of the local environment. The sulphate ions will form a salt in solution and can be incorporated into the various mineral species present in the environment. The total dissociation of sulphuric acid at environmental pH implies that it will not, per se, adsorb onto particulates or accumulate in living tissues. The individual ions are also ubiquitous in living organisms and are subject to physiological homeostasis, therefore bioaccumulation is unlikely. At environmentally relevant pH levels, the hydrogen ion concentration is very low due to reaction with hydroxyl ions in the water. The pH of a solution is equal to –log[H+] on a molar basis, so at a pH of 7, the concentration of H+ is reduced to 10e-7 M, a level that is not relevant environmentally.
Additional information
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