Selective complexometric determination of bismuth with mercaptans as masking agents, and its estimation in alloys.
A method is proposed for selective complexometric determination of bismuth. To a solution containing bismuth and other cations, excess of EDTA is added and the surplus is back-titrated at pH 5-6 with lead nitrate (Xylenol Orange as indicator). Thioglycollic or mercaptopropionic acid is then added to decompose the bismuth-EDTA complex and the liberated EDTA is titrated with lead nitrate. The interference of various cations has been studied and the method employed to determine bismuth in a variety of alloys.
Raoot
S
S
Defence Metallurgical Research Laboratory Kanchanbagh, Hyderabad-500 258, India.
Raoot
K N
KN