【国家标准】 稀土硅铁合金及镁硅铁合金化学分析方法　第1部分：稀土总量、十五个稀土元素含量的测定

This document describes the methods for determination of total rare earth and fifteen rare earth elements contents in silicon-based composite rare earth ferroalloy and RE-Mg ferro-silicon alloy.
This document is applicable to the determination of total rare earth and fifteen rare earth elements contents in silicon-based composite rare earth ferroalloy and RE-Mg ferro-silicon alloy,including inductively coupled plasma atomic emission spectrometry(Method 1)and EDTA titration method(Method 2).The determination range of method 1 is shown in Table 1.The determination range of method 2 is shown in Table 2.