Abstract
An improved spectrophotometric method for the ultramicrodetermination of alkaline earth and lanthanide elements is reported. Uranyl ion may also be determined. Hydroxynaphthol blue (HNB) dissolved in ammonia buffer (8.5 M in NH 4OH and 1.25 M in NH 4Cl), enables lanthanide elements to be detected at levels of 2.3 × 10 -7 M-6.5 × 10 -7 M, depending on the particular element. For the Group IIa elements, the lower limits of detection are 3.0 × 10 -7 M for Be 2+, 4.9 × 10 -7 M for Mg 2+ and 2.0 × 10 -6 M for Ca 2+. The sensitivity for Sr 2+ and Ba 2+ is less, with limits of 8.9 × 10 -6 M and 1.8 × 10 -5 M, respectively. Uranyl ion can be determined down to 3.3 × 10 -7M. In all cases, a 1:1 metal—dye complex is formed; formation constants were calculated for all metals involved.
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