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碘对于地质上寻找盲矿体,尤其是某些热液金属矿床是一种有效的远程探途元素。本文报告用 H_2SO_4-H_3PO_4-SnCl_2作分解试样的溶剂,抗坏血酸为还原剂,以碘离子选择电极测定岩石和土壤中碘并进行了抗坏血酸还原能力试验、抗坏血酸与亚硫酸钠对电极电位影响对比试验及酸溶加热影响等条件试验。试验表明,本法能克服以往采用半熔法手续繁杂,费时较长及亚硫酸钠对电极电位有严重影响等缺点。
Iodine is an effective long-range exploration element for finding blind ore bodies geologically, especially for some hydrothermal metal deposits. In this paper, H_2SO_4-H_3PO_4-SnCl_2 was used as the solvent for the decomposition of the sample. Ascorbic acid was used as the reducing agent. The iodine ion selective electrode was used to determine the iodine in rock and soil and the ascorbic acid reduction was tested. The effect of ascorbic acid and sodium sulfite on the electrode potential was compared. Solubility effects such as heating test. Experiments show that this method can overcome the shortcomings of complicated semi-melting method in the past, long time and sodium sulfite electrode potential have serious shortcomings.