Reactions of metallochromic indicators on micelles-III Spectrophotometric determination of minute amounts of lanthanum with xylenol orange.
Xylenol Orange in the presence of cetylpyridinium bromide is proposed for the spectrophotometric determination of minute amounts of lanthanum(III). A deep blue complex, La[(XO)(CP)(2)](2), whose molar absorptivity is 92,000 at 625 mmu is formed. Beer's Law is obeyed within the limits of 0.08 and 0.8 ppm. The effects of pH, reagent concentration, interfering ions and time of standing are described.
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Institute of Pure Chemicals, Brno, Czechoslovakia.
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