“titanous”簡單造句，titanous造句子

Among other reagents used have been ??and titanous ion.

Among other reagents used have been ??and titanous ion; a mixture of ferrous ion, oxygen, ascorbic acid, and ethylenetetraaminetetraacetic acid.

Coulometric titrations of milligram quantities of titanous ion and hypovanadous ion give errors less than 1 per cent.