Cloud point extraction of trace cyanide from environmental waters for indirect flame atomic absorption spectrometric determination


GÜRKAN R. , Yilmaz O.

TOXICOLOGICAL AND ENVIRONMENTAL CHEMISTRY, vol.95, no.9, pp.1455-1469, 2013 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 95 Issue: 9
  • Publication Date: 2013
  • Doi Number: 10.1080/02772248.2014.895364
  • Title of Journal : TOXICOLOGICAL AND ENVIRONMENTAL CHEMISTRY
  • Page Numbers: pp.1455-1469

Abstract

A method has been developed for indirect determination of cyanide in environmental waters based on cloud point extraction (CPE), preconcentration and determination by flame atomic absorption spectrometry (FAAS). The method was based on reduction of Cu(II) to Cu(I) in the presence of cyanide and complexation of the produced Cu(I)(CN)(2)(-) with gallocyanin (GC(+)) as an ion-pairing reagent at pH 4.0, followed by its extraction into polyethyleneglycol mono-p-nonylphenylether (Ponpe 7.5). Selectivity was improved with the use of suitable masking agents. Various factors influencing separation and preconcentration of cyanide have been investigated, and conditions were optimized, allowing determination of cyanide in the range of up to 1.2mg L-1 with a detection limit of 0.00045mg L-1. The method has been applied to the determination of cyanide in environmental waters, the results being in agreement with those obtained by a reference method.