title: Determination of Chlorine in Milk via Molecular Absorption of SrCl Using High-Resolution Continuum Source Graphite Furnace Atomic Absorption Spectrometry.
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 μg of Sr as the molecule-forming reagent and applying a pyrolysis temperature of 600 °C and a molecule-forming temperature of 2300 °C. Linearity was maintained up to 500 μg 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 μg 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).
authors.affiliation: Department of Chemistry, Faculty of Arts and Sciences, Istanbul Technical University , 34469 Maslak, Istanbul, Turkey.
authors.forename: Nil
authors.initials: N
authors.lastname: Ozbek
authors.affiliation: Department of Chemistry, Faculty of Arts and Sciences, Istanbul Technical University , 34469 Maslak, Istanbul, Turkey.
authors.forename: Suleyman
authors.initials: S
authors.lastname: Akman
mesh_terms: D000818:Animals; D002417:Cattle; D002713:Chlorine / Q000032:analysis*; D006108:Graphite / Q000737:chemistry; D008892:Milk / Q000737:chemistry*; D013054:Spectrophotometry, Atomic / Q000295:instrumentation / Q000379:methods*; D013696:Temperature
chemical_list: D002713:Chlorine; D006108:Graphite
keywords: chlorine determination; high-resolution continuum source graphite furnace atomic absorption spectrometry (HR-CS GFAAS); milk; molecular absorption spectrometry (MAS); strontium monochloride (SrCl)