title: Improvement of the sensitivity of molybdenum and tungsten determination in niobium and tantalum.
abstract: 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.
authors.affiliation: Ledoux and Company 359 Alfred Avenue Teaneck, New Jersey, U.S.A.
authors.forename: S
authors.initials: S
authors.lastname: Kallmann
authors.forename: E W
authors.initials: EW
authors.lastname: Hobart
authors.forename: H K
authors.initials: HK
authors.lastname: Oberthin