New convenient dissolution of iron-rhodium alloys using hydrochloric acid containing a small amount of nitric acid without heating for an ICP-AES analysis

A new convenient dissolution method for Fe-Rh alloys has been developed. Aq ua regia has been used for the dissolution of rhodium alloy samples. Howeve r, it is difficult to dissolve high-concentration rhodium (more than 50 mas s%) in aqua regia, because a rhodium-passivity on the alloys surface occurs with nitric acid. By using hydrochloric acid containing a small volume of nitric acid, Fe-Rh (24 - 64 mass%) alloys could be completely decomposed an d dissolved under mild experimental conditions. The principal advantages of this method are simplicity and time-saving compared with other dissolution methods.