【摘要】 用分光光度法测定加钙盐和钙强化醋中钙的含量。在HCl介质中,钙与二溴对甲基偶氮甲磺反应生成兰色的配合物,其最大吸收波长为638nm,摩尔吸光系数为5.5×104L(/mol·cm)。钙量在0μg/50mL～20μg/50mL范围内符合比尔定律,该法具有很好的选择性,可直接用于测定调味品中钙的含量。更多还原

【Abstract】 A spectrophotometric method was used for the determination of calcium in calcium salt or calcium vinegar.In HCl solution,the calcium reacted with dibromo-p-methyl-methyl sulfonazo(DBM-MSA) to form a blue complex,whose maximum absorption wave length and apparent molar absoptivity were 638 nm and 5.5×104 L/mol·cm,respectively.The Beer’s law was fitted when calcium content ranged between 0 μg and 20 μg in 50ml solution.It was indicated that the spectrophotometric method has a high selectivity,and could be directly used for calcium content determination in condiments.更多还原