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
  • Keywords: high-resolution continuum source graphite furnace atomic absorption spectrometry (HR-CS GFAAS), molecular absorption spectrometry (MAS), chlorine determination, strontium monochloride (SrCl), milk, SOLID SAMPLE ANALYSIS, FOOD SAMPLES, FLUORINE, BROMINE, MONOFLUORIDE, TITRATION, SULFUR, FLAMES, WATER, ALCL

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.