Application of Ultrasound-Assisted Cloud-Point Extraction and Spectrophotometry for Preconcentration and Determination of Trace Amounts of Copper(II) in Beverages

Temel N. K. , GÜRKAN R.

JOURNAL OF ANALYTICAL CHEMISTRY, vol.74, no.12, pp.1174-1183, 2019 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 74 Issue: 12
  • Publication Date: 2019
  • Doi Number: 10.1134/s1061934819120128
  • Page Numbers: pp.1174-1183


A new method for preconcentration of trace Cu(II) in beverages before determination by spectrophotometry is presented. The method is based on the ternary complex formation of Cu(II) with Safranin T in presence of pyrogallol at pH 5.5 followed by its extraction into the micellar phase of Triton X-114. The ternary complex was monitored by spectrophotometry at 532 nm. Variables affecting extraction efficiency were evaluated and optimized. Under the optimal conditions, the detection limit was 0.6 mu g/L in the range of 2-300 mu g/L with sensitivity enhancement of 55 after preconcentration from 15 mL of the sample, and precision was in the range of 2.5-3.9%. The accuracy was verified by the analysis of two certified samples and recovery studies of the spiked samples. The intra- and inter-day precision varied in the ranges of 3.7-4.6 and 3.9-5.2%, respectively. The method was successfully applied to determination of trace Cu(II) in beverages.