吸光光度法测定辣椒中的稀土总量

Photometric Determination of Rare Earth Content in Cayenne

研究了以对马脲酸偶氮氯膦为显色剂，测定辣椒样品中的稀土总量，选择三乙醇胺为掩蔽剂，体系酸度为０ ．２ ～０ ．２４ ｍｏｌ·Ｌ－ １ ，该体系稀土离子含量在０ ～８ μｇ／２５ｍＬ范围内服从比尔定律．用该法测定辣椒中的稀土总量，获得满意结果．测定的相对标准偏差≤３．１％ ，方法回收率为９５％ ～１０１ ％ ．

This paper reports the photometric determination of total rare earth content in cayenne by using the chlorophosphonazo p hippuric acid as colour reagent. The screening agent is triethauolamche, pH is 0.2～0.24 mol/L. Beer's law is obeyed in the concentration range of 0～8 μg RE/25 mL. The factors influencing the determination of RE have been studied and satisfactory results have been obtained. The RSD of method is ≤3.1%, the percent recovery is in the range of 95%～101%.