Novel method for determination of sodium in foods by thermometric endpoint titrimetry (TET)

• 作者: Christian Haider Thomas Smith
• 来源期刊: 农业化学和环境(英文)
• 学科: 化学
• 关键词: SODIUM TITRATION Food Foodstuffs TET Thermometric ENDPOINT TITRATION Elpasolite
• 年，卷（期）: nyhxhhjyw_2014,（1）
• 页码范围: 20-25
• 页数: 6页
• 分类号: O6

摘要

A novel yet simple, rapid and robust thermometric endpoint titration (TET) method for the determination of sodium in various foodstuffs is described. Sodium reacts exothermically with aluminium in the presence of an excess of potassium and fluoride ions to form NaK2AlF6 (“elpasolite”). This reaction forms the basis of a ro- bust, reliable analytical procedure suitable for routine process control. The reaction of calcium under similar conditions (to form KCaAlF6) suggests that potentially, calcium may interfere in the determination of sodium in some foodstuffs. Results of an investigation suggest that at molar ratios [Ca]/[Na] < 0.85, an error of <1% of the measured value of sodium is incurred.