Spectrophotometric Estimation of Lanthanum with Alizarine Red S and Triton X-100 -Applications to Water Samples and Urine

Ismael, Ahmad; Mohammed, Salim Ali

doi:10.33899/rjs.2023.178572

	Spectrophotometric Estimation of Lanthanum with Alizarine Red S and Triton X-100 -Applications to Water Samples and Urine
Rafidain Journal of Science
Volume 32, Issue 2, June 2023, Pages 20-29 PDF (921.75 K)
Document Type: Research Paper
DOI: 10.33899/rjs.2023.178572
Authors
Ahmad Ismael^* ¹; salim ali mohammed^* ²
¹Collage os science Chemistry Department. University of Mosul
²department of chemistry .college of science , university of mosul , mosul , Iraq
Abstract
This method involves the development of a highly sensitive spectrophotometric procedure to estimate lanthanum in an aqueous medium. The procedure involved the treatment of lanthanum with Alizarine Red S as chromophor reagent in presence of neutral surfactant (Triton X-100). At pH4.5, a soluble red complex was produced and exhibited absorption peak with maximum absorption at 523nm. The calibration graph was linear and compatible to Beer's law over the range of concentration 0.125 to 10.0 µg.ml^-1 with determination coefficient (R²=0.9994). The apparent molar absorptivity of the complex La-ARS was found to be 0.7222x10⁴l.mol^-1.cm^-1 which corresponds to the sensitivity of Sandell’s index of 0.0192 µg.cm^-2. The stoichiometric of the complex was studied and it is equal to 1:2 (La: ARS). The values of LOD, LOQ and the range of recovery percentage were estimated and found to be 0.04182, 0.04434 µg.ml^-1and 96.1% to 103.5%, respectively. The precision (RSD) was also calculated and found to be in the range 0.469 to 1.612. The proposed procedure has been applied successfully for the determination of lanthanum in natural waters and urine sample.
Keywords
Lanthanum; Alizarine Red S; Triton X-100; Spectrophotometry

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