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  • Title: A versatile green analytical method for determining chlorine and sulfur in cereals and legumes.
    Author: Rondan FS, Coelho Junior GS, Pereira RM, Henn AS, Muller EI, Mesko MF.
    Journal: Food Chem; 2019 Jul 01; 285():334-339. PubMed ID: 30797354.
    Abstract:
    A versatile, rapid and safe green method for chlorine and sulfur determination using ion chromatography in cereals and legumes was developed. Microwave-induced combustion was evaluated for sample preparation. Ultrapure water and alkaline solutions were assessed for absorption of the analytes. Water was selected because good recoveries (97-109%) were obtained for both analytes. Low consumption of reagents and small quantities of waste are two important advantages of the proposed method. Accuracy was evaluated by analysis of a standard reference material, which agreed with certified values (91-101%). The results for repeatability (RSDs ≤ 4%) and intermediate precision (RSDs ≤ 7%) prove the good precision of the proposed method. Limits of quantification were 16 and 17 mg kg-1 for Cl and S, respectively. Concentrations of Cl and S varied across a wide range (Cl: 35-930 mg kg-1; S: 678-5124 mg kg-1) for 34 samples analyzed, which were, for most of the results, close to the values found in the literature.
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