Improvement of the sensitivity of molybdenum and tungsten determination in niobium and tantalum.
A more sensitive dithiol method is described for determination of as little as 0.5 ppm molybdenum and tungsten in high-purity niobium and tantalum. The increased sensitivity is achieved by taking a much larger sample and extracting the bulk of the Nb or Ta into isobutyl methyl ketone. Selective extraction then separates Mo and W.
Kallmann
S
S
Ledoux and Company 359 Alfred Avenue Teaneck, New Jersey, U.S.A.
Hobart
E W
EW
Oberthin
H K
HK