Direct photometric determination of lead by manual and flow injection methods with gallocyanine

Nor Azah Yusof, Musa Ahmad

Research output: Contribution to journalArticle

Abstract

A direct photometric method was developed for the determination of sub-nanogram levels of lead. The method is based on complexation between lead and gallocyanin, which form a coloured dye (λmax, 550 nm) at pH 8.0. The determination was based on the use of kinetic approach and in the lead concentration range of 1.0 × 10-3 μg/mL to 1.0 x 101 μg/mL, a smooth calibration curve was obtained. The reaction system can also be successfully adapted to flow injection analysis (FIA). The dynamic range of the proposed flow injection method was 1.0 x 10-3 μg/mL to 1.0 × 102 μg/mL and detection limit was 1.6 ng/mL at a sampling rate of 30 injections per hour. At 1:1 mole ratio of lead to the interfering ion, mercury, iron, aluminium, citrate and fluoride were found to interfere most during the determination.

Original languageEnglish
Pages (from-to)6190-6198
Number of pages9
JournalAsian Journal of Chemistry
Volume21
Issue number8
Publication statusPublished - Oct 2009

Fingerprint

Complexation
Mercury
Coloring Agents
Iron
Calibration
Ions
Sampling
Kinetics
gallocyanine
Lead
aluminum fluoride
aluminum citrate

Keywords

  • Flow injection analysis
  • Gallocyanin
  • Lead determination
  • Photometry

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Direct photometric determination of lead by manual and flow injection methods with gallocyanine. / Yusof, Nor Azah; Ahmad, Musa.

In: Asian Journal of Chemistry, Vol. 21, No. 8, 10.2009, p. 6190-6198.

Research output: Contribution to journalArticle

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