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氢化物电热原子化法灵敏度较高,可以很好地测定铜合金中的微量锑和锡。加入硫脲使 Cu~(2+)还原成 Cu~+,Cu~+又和硫脲形成络合物于是消除了大量铜的干扰。此方法具有灵敏度高,准确,快速简便,不需要扣除背景等优点,测定精度可达5～8%。在酸性溶液中锑和锡离子与硼氢化钾(钠)作用生成挥发性的共价氢化物,该气体由载气带入石英管中在不太高的温度下分解,产生被测定的基态原子,借此测定锑和锡。
Hydride electrothermal atomization method has high sensitivity and can measure trace antimony and tin in copper alloy well. Adding thiourea to Cu ~ (2 +) reduced to Cu ~ +, Cu ~ + and thiourea complex formation thus eliminating a lot of copper interference. The method has the advantages of high sensitivity, accuracy, quickness and convenience, without needing to deduct the background and the like, and the determination accuracy can reach 5 to 8 percent. In acidic solutions, antimony and tin ions react with potassium borohydride (sodium) to form volatile covalent hydride, which is carried by the carrier gas into the quartz tube and decomposes at a temperature not too high to produce the ground state atoms to be measured , To determine antimony and tin.