Volume No. 7 Issue No.: 4 Page No.: 1355-1362 April-June 2013

 

MICROEXTRACTION OF VANADYL PORPHYRINS AS WATER POLLUTANT BY NANO-BASKETS

 

Bahram Mokhtari and Kobra Pourabdollah

Razi Chemistry Research Center (RCRC), Shahreza Branch, Islamic Azad University, Shahreza (IRAN)

 

Received on : November 03, 2012

 

ABSTRACT

 

Vanadyl porphyrins are present in the produced water of oil fields and are considered as one of the water pollutant groups. The novelties of this approach is nano-extraction of charged porphyrins by nano-baskets of calixcrown, which act as the settling agents as well as the inclusion ligands. Four proton di-ionizable diacid conformers of 25,26-bis(carboxymethoxy)calix[4]arene-27,28-crown-3, -crown-4, -crown-5 and -crown-6 in the cone conformation were synthesized and used. The related parameters including ligand concentration, volume of water disperser, salt effect and extraction time were optimized. The linear range, detection limit (S/N = 3) and precision (RSD, n = 6) were determined to be 0.2–50, 0.07 μgL−1 and 5.3% respectively. The established method was applied to determine the target compound in five samples of live crude oil were sampled from an Iranian offshore field. Owing to the overall differences (such as organic media, inclusion extraction water-soluble ligands, etc) the comparison of the proposed method with the traditional liquid-liquid microextraction was inapplicable. These results revealed that the new approach is competitive analytical tool and an alternative of the traditional methods in the crude oil and related systems

 

Keywords : Nano-baskets, Liquid-Liquid Microextraction, Vanadyl Porphyrins, Calixcrown, Crude oil

 

 

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