在土壤、水系沉积物、岩石矿物等样品的碘元素测定过程中,由于碘单质容易挥发,因此样品中的碘元素在样品溶解过程中很容易损失,若采用固体熔解样品会导致样品溶液中盐度过高,大型仪器进样系统堵塞,背景干扰严重等问题,因此不能使用大型精密仪器来分析.为了解决这一方面的问题,采用碳酸钠和氧化锌混合熔剂来对样品进行加热半封闭溶解,从而减少了碘元素在样品溶解过程中的损失,溶解后的样品用热水提取后静置分层,取上清液经阳离子交换树脂交换吸附溶液中的大部分阳离子,从而降低了待测溶液中的含盐量,进而可以使用电感耦合等离子质谱仪对样品进行测试,通过对国家标准样品和青海省某地区样品的测试,结果表明测试数据的准确度、精密度、检测范围都严格符合中华人民共和国地质矿产质量管理行业标准.%In the iodine determination samples of soil, stream sediment and rock, there exists in the sample of iodine easy to loss.If using solid leads to dissolve samples into the salinity, the solution of sample preparation is very high.We can't use large precise instrument to analyze it.In order to solve the problem, this experiment is adopted in the sodium carbonate and zinc oxide mixed solvent by heating the samples to be partly dissolved.Thereby, reducing the iodine in the process of sample dissolution loss, it will let itself stand after dissolving samples with hot water in stratification.We will take the supernatant by cation exchange resin to absorb the solution to most of the cation.Thus, it will reduce the salt content in the solution under the test.The samples of inductively-coupled plasma mass spectrometry can be tested to pass through the national standard and the standard of Qinghai province.The results show that the accuracy, including the precision of test data and the detection limit are strictly in conformity with the quality management of geology and mineral resources of industry standard requirements of the People's Republic of China.
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