Spectrophotometric Determination of Lanthanum (III) With Bromopyrogallol Red And Cetylpridinium Chloride -Applications in Natural Waters and Urine

A highly sensitive spectrophotometric procedure for the estimation of lanthanum in aqueous medium has been established. The method was involved reaction with bromopyrogallol as chelating agent presence cetylpyridinium chloride at pH4.61 to produce a soluble blue colour ternary complex exhibited maximum absorption 661nm. adheres Beer's low over concentration range 0.125 –5.0 μg/ml coefficient determination (r2= 0.9987). molar absorptivity(ℇ) (La(III)-BPR-CPC) is 5.39x104 M-1cm-1 which corresponds Sandell's sensitivity index 0.00258 μg.cm-2. stoichiometric composition estimated and found be (1:2:4) (La:BPR:CPC), respectively. values detection limit (DL) quantitation (QL) were calculated 0.0630 0.0817 μg.ml-1, recovery% 95.3% 103.5%, while precision (RSD) 0.126 1.705. proposed applied successfully natural waters urine sample.