Determination of Chlorine in Milk via Molecular Absorption of SrCI Using High-Resolution Continuum Source Graphite Furnace Atomic Absorption Spectrometry


Ozbek N. , Akman S.

JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY, vol.64, no.28, pp.5767-5772, 2016 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 64 Issue: 28
  • Publication Date: 2016
  • Doi Number: 10.1021/acs.jafc.6b02024
  • Title of Journal : JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
  • Page Numbers: pp.5767-5772

Abstract

Total chlorine in milk was determined via the molecular absorption of diatomic strontium monochloride at 635.862 nm using high-resolution continuum source graphite furnace atomic absorption spectrometry. The effects of coating the graphite furnace, using different modifiers, amount of molecule-forming element, and different calibrants were investigated and optimized. Chlorine concentrations in milk samples were determined in a Zr-coated graphite furnace using 25 mu g of Sr as the molecule-forming reagent and applying a pyrolysis temperature of 600 degrees C and a molecule -forming temperature of 2300 degrees C. Linearity was maintained up to 500 mu g mL(-1) of Cl. The method was tested by analyzing a certified reference wastewater. The results were in the uncertainty limits of the certified value. The limit of detection of the method was 1.76 mu g mL-1. The chlorine concentrations in various cow milk samples taken from the market were found in the range of 588-1472 mg L-1.