Preconcentration and Determination of Trace Vanadium(V) in Beverages by Combination of Ultrasound Assisted-cloud Point Extraction with Spectrophotometry


Creative Commons License

Temel N. , GÜRKAN R.

ACTA CHIMICA SLOVENICA, cilt.65, ss.138-149, 2018 (SCI İndekslerine Giren Dergi) identifier identifier identifier

  • Cilt numarası: 65 Konu: 1
  • Basım Tarihi: 2018
  • Doi Numarası: 10.17344/acsi.2017.3724
  • Dergi Adı: ACTA CHIMICA SLOVENICA
  • Sayfa Sayıları: ss.138-149

Özet

A novel ultrasound assisted-cloud point extraction method was developed for preconcentration and determination of V(V) in beverage samples. After complexation by pyrogallol in presence of safranin T at pH 6.0, V(V) ions as ternary complex are extracted into the micellar phase of Triton X-114. The complex was monitored at 533 nm by spectrophotometry. The matrix effect on the recovery of V(V) from the spiked samples at 50 mu g L-1 was evaluated. In optimized conditions, the limits of detection and quantification of the method, respectively, was 0.58 and 1.93 mu g L-1 in linear range of 2-500 mu g L-1 with sensitivity enhancement and preconcentration factors of 47.7 and 40 for preconcentration from 15 mL of sample solution. The recoveries from spiked samples were in range of 93.8-103.2% with a relative standard deviation ranging from 2.6% to 4.1% (25, 100 and 250 mu g L-1, n: 5). The accuracy was verified by analysis of two certified samples, and the results were in a good agreement with the certified values. The intra-day and inter-day precision were tested by reproducibility (as 3.3-3.4%) and repeatability (as 3.4-4.1%) analysis for five replicate measurements of V(V) in quality control samples spiked with 5, 10 and 15 mu g L-1. Trace V(V) contents of the selected beverage samples by the developed method were successfully determined.