Journal of
Toxicology and Environmental Health Sciences

  • Abbreviation: J. Toxicol. Environ. Health Sci.
  • Language: English
  • ISSN: 2006-9820
  • DOI: 10.5897/JTEHS
  • Start Year: 2009
  • Published Articles: 206

Full Length Research Paper

Evaluation of environmental sulphide by stabilisation of the initial product of the pentacyanonitrosylferrate(II)-sulphide reaction

Jolocam Mbabazi*, S. Yiga and H. Ssekaalo
Department of Chemistry, Makerere University, P. O. Box 7062, Kampala, Uganda.
Email: [email protected]

  •  Accepted: 15 February 2011
  •  Published: 30 April 2011

Abstract

Determination of environmental sulphide requires non-interference from other anions. Cyanide stabilisation of the transient red-violet product of the pentacyanonitrosylferrate(II)-sulphide reaction enables effective quantification of a 0.3 to 5 working range and a 0.2 μg ml-1 limit of detection. Sulphide in standard 2.0 μg ml-1 solutions was detected to within 2.4% standard deviation. The technique has been applied to hot-spring water, marshland water and boiled eggs. The mean sulphide levels were 1.7 ± 0.2, 9.9 ± 0.2 and 21.7 ± 0.2, which compared favourably with 1.9 ± 0.3, 10.9 ± 0.3 and 22.6 ± 0.3 μg ml-1, respectively, by iodimetry.

 

Key words: Environmental sulphide, determination, Pentacyanonitrosylferrate(II)-sulphide reaction, cyanide stabilization.