Kinetic fluorimetric determination of traces of vanadium(V) by means of a catalysed autoxidation process

Sánchez, Francisco; Navas, A.; Santiago, Marisa Antunes; Gráses, F.

doi:10.1016/0039-9140(81)80025-2

Cited by 19 publications

(1 citation statement)

References 3 publications

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“…A number of analytical detection techniques are used for vanadium determination. In general, the most commonly used analyti-cal techniques are flame atomic absorption spectrometry (FAAS), 10,11,12 electrothermal atomic absorption spectrometry (ET-AAS), which is also known as graphite furnace AAS (GF-AAS), 13 inductively coupled plasma mass spectrometry (ICP-MS), 14,15 neutron activation analysis (NAA), 16 inductively coupled plasma-optical emission spectrometry (ICP-OES), 17 fluorometry, 18,19 requiring sample pretreatment steps such as ion-exchange, 20 solid phase extraction (SPE), 21,22 liquid phase microextraction (LPME), 23 and cloud point extraction (CPE). [24][25][26][27][28] CPE is superior to traditional solvent extraction because of its high extraction yield and preconcentration factor, and has several advantages such as simplicity, inexpensiveness, operational safety and use of non-toxic rea gents.…”

Section: Introductionmentioning

confidence: 99%

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

Temel¹,

Gürkan²

2018

ACSi

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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 µg L-1 was evaluated. In optimized conditions, the limits of detection and quantification of the method, respectively, was 0.58 and 1.93 µg L-1 in linear range of 2-500 µg 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 µg 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 µg L-1. Trace V(V) contents of the selected beverage samples by the developed method were successfully determined.

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