【摘要】 本文研究了新合成的显色剂4,6-二溴偶氮胂Ⅲ同稀土的显色反应,该试剂是一种灵敏度高、选择性好的稀土总量试剂。大量的钙(0.7毫克)、镁(100毫克)、铝(19毫克)、铁[2.5毫克,有抗坏血酸(5%)2.5毫升存在]不干扰测定。稀土含量在0～5微克/25毫升范围内(5厘米比色皿)符合比尔定律,可用于直接光度测定人发中痕量稀土,方法简便、准确。更多还原

【Abstract】 In this paper, the color reaction of dibromoarscnazo Ⅲ 2-（2-arsonophenylazo）-7-（2-arsono, 4, 6 dibromo）-1, 8-dihydroxy-3,6-disulfonaphthalene) with total amount of Rare Earth has been studied.This reagent was fonnd to have high sensitivity (ε_ce=1.18·10⁵) and good selectivity. Large amounts of Ca （0.7mg） Mg （100rag） Al（19mg） and Fe（2.5mg5%VitC 2.5ml） do not interfere with the determination. The absorption maximum of the complex is near 630 nm. Beer’s law is obeyed for O-5ug RE₂O₅/25ml （5cm cell） ranges. It was applied to determine the trace Rare Earths in Human Hair by direct Spectrophotometric method. which was simple exact and rapid. The results were satisfactory.更多还原