EDTA容量法测定炉渣中CaO、MgO时干扰元素的消除

Removal of interferential elements in determining CaO, MgO in slag by EDTA titrimetry

对EDTA容量法测定炉渣中CaO、MgO时干扰元素的消除进行研究.在乙酸介质中,用铜试剂分离铁、镍、钴、铜、钨、钒、钼、铅、砷、锑、铂、铝、等干扰元素,再用三乙醇胺对分离不完全的铁、钛、铝等进行掩蔽.该方法使CaO、MgO滴定期终点明显,并有良好的精确度和满意的准确度.

The removal of interferential elements in determining CaO, MgO in slag by EDTA titrimetry is approached in the paper. It is shown that the interferential element such as Ni, Co, Cu, W, V, Mo, Pb, As, Sb, Pt and Al can be separated from the slag by cupron in acetic acid, and the remaining Fe, Ti and Al are then masked by triethanolanmine. The method can clearly display the final point of titration, thus yielding good accuracy and precision.