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三苯甲烷和偶氮试剂最常用于各种分光光度法测定铍。如铬天青S法、铬菁R法。铍试剂Ⅲ和铍试剂Ⅳ法等。钙试剂羧酸钠盐(以下简称钙试剂)用于萃取分光光度法测定铍的显色剂尚未见报导。本文对钙试剂—Be(Ⅱ)显色体系进行了研究。并测定了水中微量铍的含量。 在PH5.0～6.5的溶液中钙试剂与Be(Ⅱ)形成1:1兰色络合物,铍含量在0～7微克/25毫升范围内服从比耳定律,在640nm处摩尔吸光系数为1.1×10~4l·mol~(-1)cm~(-1)。Cu(Ⅱ)、Fe(Ⅱ)、Cd(Ⅱ)等离子干扰可用EDTA掩蔽,该体系显色灵敏,快速,用EDTA作掩蔽剂,具有良好的选择性。
Triphenylmethane and azo reagents are most commonly used for the spectrophotometric determination of beryllium. Such as chrome azure S method, chrome cyanide R method. Beryllium reagent Ⅲ and beryllium reagent Ⅳ method. Calcium reagent Carboxylic acid sodium salt (hereinafter referred to as calcium reagent) for the extraction spectrophotometric determination of beryllium developer has not been reported. In this paper, the colorimetric system of calcium reagent-Be (Ⅱ) has been studied. The content of trace beryllium in water was determined. The calcium reagent and Be (Ⅱ) form a 1: 1 blue complex in the solution of PH5.0 ~ 6.5. The beryllium content obeys Beer’s law in the range of 0 ~ 7 μg / 25 ml. The molar absorptivity at 640 nm is 1.1 × 10 ~ 4l · mol ~ (-1) cm ~ (-1). The interference of Cu (Ⅱ), Fe (Ⅱ) and Cd (Ⅱ) ions can be masked with EDTA. The system is sensitive and rapid in color development and has good selectivity with EDTA as masking agent.