Separation method and analysis method of trace precious metals

Japanese Patent JP6325358

B2

PROBLEM TO BE SOLVED: To provide a method capable of analyzing noble metals enabling quantitative determination to a sample including noble metals such as iridium, ruthenium and rhodium in trace quantity.SOLUTION: Provided is a method for separating trace noble metals comprising: a first step where a sample including a total of below 10 ppm of at least one or more kinds selected from iridium, ruthenium and rhodium and also including a compound of iron or copper is heated with an alkali flux and melted to obtain a melt, the melt is cooled and leached with hot water to obtain a solution, and ethanol is added to the obtained solution to produce precipitates, and solid-liquid separation is caused; a second step where the precipitates obtained in the first step are leached into water and ethanol, hydrochloric acid is added to the obtained solution, heating and melting are performed, thereafter, if required, a sodium chloride solution is added, and heating and solidification are performed; and a third step where hydrochloric acid is added to the precipitates obtained in the second step, heating and melting are caused, and thereafter, the solution obtained by cooling the same is passed into a cation exchange resin.

Kenichi Uemura
Hiroshi Kashimura

JP2014119798A

May 16, 2018

June 10, 2014

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JX Nippon Mining & Metals Co., Ltd.

C22B11/00; C22B3/10; C22B3/12; C22B3/42; C22B9/10; C22B11/02; G01N27/62; G01N31/00; G01N31/02

JP2008232808A
JP2002030357A
JP6240376A
JP3277730A
JP3277731A
JP4259341A
JP2006266988A
JP8217460A
JP2002139438A
JP11190730A

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