微量单矿物中硫的测定,由于待测试样量甚少,难以采用重量法以及常用的碘量法进行测定。鉴于碘离子选择性电极性能较好,本法采用特制的装有石英管的小型热解炉分解试样,在有助熔剂氧化铜的存在下.于1000℃使硫以二氧化硫形式逸出,将其通入碘吸收液中,将碘还原成碘离子,继用碘离子选择性电极测定之。从而达到间接测定硫的目的。反应如下: Determination of trace single mineral sulfur, due to the small amount of sample to be tested, it is difficult to use gravimetric method and commonly used iodometric method for determination. In view of the better performance of iodine ion selective electrode, this method uses a special pyrolytic furnace decomposition sample containing quartz tube in the presence of a flux of copper oxide at 1000 ℃ to sulfur as sulfur dioxide in the form of Its access to iodine absorption solution, the iodine is reduced to iodide, followed by iodide selective electrode determination. So as to achieve the purpose of indirect determination of sulfur. The reaction is as follows: