分光光度测定钍的有效显色剂至今为数不多,比较重要的几种列于表1。直到前不久,偶氮胂化合物钍试剂仍几乎独有地被用来做为测定钍的显色剂,现在虽然在很大程度上它已被灵敏度更高、选择性更好的偶氮肿Ⅲ所取代,但在某些特殊情况下它仍可能被应用。钍试剂是优点较多的显色剂。它在酸性溶液中与钍反应显色迅速,颜色能稳定几天,干扰 Spectrophotometric determination of thorium effective developer so far one of the more important are listed in Table 1. Until recently, the arsonium arsenide compound, thorium, was still used almost exclusively as a chromogenic reagent for the determination of thorium. Now, although it has largely been characterized by its higher sensitivity and selectivity, Replaced, but in some special cases it may still be applied. Thoron reagent is more advantages of the developer. It reacts rapidly with thorium in acidic solution, and the color can be stable for a few days and interfere with it