Abstract − Analytical Sciences, 16(6), 575 (2000).
Extraction-Spectrophotometric Determination of Trace Amounts of Barium by 18-Crown-6 and Rose Bengal
Hooshang PARHAM and Abbass G. FAZELI
Department of Chemistry, Faculty of Science, Azad University, Gachsaran, Iran
A simple and sensitive extraction-spectrophotometric method for the determination of barium is reported. The 18C6-barium-Rose Bengal (18C6-Ba-RB) ternary complex was quantitatively extracted into dichloromethane, and itsabsorbance was measured at 565 nm. The calibration graph is linear over a barium concentration range of 0.083 - 4.70 ugml-1. The limit of detection of barium was 17.7 ng ml-1. The relative standard deviation (RSD) of ten replicatemeasurements was 2.19% for a 0.83 ug ml-1 barium solution. The interference effects of various cations and anions werealso studied and reported. The described method provides a simple and reliable means for determination of trace amountsof barium in real samples.
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