目前测定矿物中的铱多采用钵(Ⅳ)-砷(Ⅲ)体系催化比色法。铱在盐酸-硫脲-碘化钾的复合底液中可产生催化波,但仍未得到广泛应用。我们在资料的基础上进行试验,于原来介质中引人TeO_3~2时发现碲可加强铱的催化性能,不仅能提高测定铱的灵敏度,而且出现了尖陡的波峰(图1),波峰出现于碲波之后且与碲量有一定关系,即使没有硫脲存在也可产生催化波(图2)。 At present, the determination of iridium in minerals is mostly based on the catalytic colorimetry using arsenic (Ⅲ) system. Iridium in hydrochloric acid - thiourea - potassium iodide composite bottom liquid can produce catalytic wave, but has not been widely used. We conducted experiments on the basis of the data and found that the addition of TeO 3 ~ 2 to the original medium can enhance the catalytic performance of iridium, which not only improves the sensitivity of the determination of iridium, but also shows a sharp peak (Figure 1) After the tellurium wave and with a certain relationship with the amount of tellurium, even without the presence of thiourea can produce catalytic wave (Figure 2).