Disodium ethylenediamine tetraacetate is a good sequesterant. 乙二胺四乙酸二钠是一种优秀的络合剂。
Reagent pure phosphato-tungstic acid was prepared by reacting sodium tungstate with dis-odium hydrogen phosphate and acidifying with hydrochloric acid. 由钨酸钠与磷酸氢二钠反应，再经盐酸酸化制得了试剂级的磷钨酸。
