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以硝酸 -氢氟酸分解样品 ,高氯酸冒烟驱除氢氟酸及硝酸 ,在 pH10的NH3·H2 O -NH4 Cl缓冲体系中 ,用EDTA络合滴定法测定钙和钡 ,并与重量法对照 ,两者结果获得了良好的一致性。
Hydrofluoric acid and nitric acid were driven off with nitric acid-hydrofluoric acid and perchloric acid. The calcium and barium were determined by EDTA complexometric titration in NH3 · H2O-NH4Cl buffer system at pH10, Control, the results of the two obtained a good consistency.