Assertion: gypsum's effect | /r/CreatedBy | the role of so 4 2−
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Source sentences:
text: The latter effect has been attributed to the role of SO 4 2− in either the precipitation of Al, which is in line with reported precipitation of jurbanite, basaluminite, or alunite in acid media containing Al3+ and SO 4 2− (Nordstrom, 1982) or an increase in the formation of SO 4 2− complexes Al in solution, which is less phytotoxic (Pavan and Bingham, 1982; Pavan et al., 1982).