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方钍石是钍来源的重要含钍矿物。目前测定钍的含量的方法较多,虽有用5-Br-PADAP测定钍的方法的报导,但未见有在triton X-100存在下,用5-Br-PADAP直接测定方钍石中钍的含量的报导。Triton X-100的存在,使测定的酸度增加,从而增加干扰元素的干扰比;并且增加了络合物的稳定时间。本文采用5-Br-PADAP作显色剂,在氯乙酸-氯乙酸钠缓冲体系中用triton X-100表面活性剂胶束增溶分光光度测定方钍石(人工样品)中钍的含量,获得较满意的结果。在25毫升中,钍的比耳定律范围在0～20微克,摩尔吸光系数为5.2×10~4升·摩尔~(-1)·厘米~(-1),Sandell灵敏度为0.0045微克钍(IV)/厘米~2。我们对两种含量的方钍石人工样品进行了测试,结果良好,回收率在97.3～101.4％之间,此方法可靠,精密度较高,误差符合微量组分的测定要求,我们对样品测定结果表示满意。
Quartzite is an important source of Thorium containing thorium minerals. Currently there are many methods for the determination of thorium. Although 5-Br-PADAP is used for the determination of thorium in thorium, there is no direct determination of thorium in thorium with 5-Br-PADAP in the presence of triton X-100 Content reports. The presence of Triton X-100 increases the acidity of the assay, thereby increasing the interference ratio of interfering elements; and increasing the stabilization time of the complex. In this paper, 5-Br-PADAP was used as color reagent to determine the content of thorium in the square of thorium (artificial sample) by micellar solubilization spectrophotometry with triton X-100 surfactant in chloroacetic acid-sodium chloroacetate buffer system. Satisfactory results. In 25 ml, the thorium Beer’s Law ranged from 0 to 20 micrograms, with a molar extinction coefficient of 5.2 × 10 4 L · mol -1 cm -1. Sandell’s sensitivity was 0.0045 micrograms thorium (IV) ) / Cm ~ 2. We have two kinds of artificial square thorium stone samples were tested, the results were good, the recovery was between 97.3 ~ 101.4%, this method is reliable, high precision, the error in line with the determination of trace components, we determine the sample Satisfied with the results.