碱熔-电感耦合等离子体原子发射光谱法测定高碳铬铁中铬  

Determination of chromium in high-carbon ferrochrome by alkali fusion-inductively coupled plasma atomic emission spectrometry

作　　者：仝晓红[1] 刘攀[1] 聂富强[1] 

机构地区：[1]中国船舶重工集团公司第七二五研究所,河南洛阳471023

出　　处：《冶金分析》2015年第9期36-41,共6页Metallurgical Analysis

摘　　要：样品用过氧化钠高温熔融,试液经硝酸-盐酸酸化后,选择Cr 267.716nm（Ⅱ）作为分析谱线,采用两点法扣除背景克服光谱背景干扰和基体匹配方法消除物理干扰,以铁基体溶液建立校准曲线,建立了电感耦合等离子体原子发射光谱法（ICP-AES）测定高碳铬铁中铬的方法。在仪器工作条件下,校准曲线的线性范围为w（Cr）=40%～100%,线性相关系数r〉0.999。按照实验方法测定高碳铬铁标准样品、合成样品以及实际样品,测定值与认定值、理论值或标准方法 GB/T 4699.2-2008测定值基本一致,结果的相对标准偏差（RSD,n=6）小于1.0%。The sample was fused with sodium peroxide at high temperature, and the sample solution was a- cidified with nitric acid and hydrochloric acid. Cr 267. 716 nm （ll） was selected as the analytical line. The spectral background interference was overcome by background deduction with two-point method, and the physical interference was eliminated by matrix matching method. The calibration curve was prepared with iron matrix solution. Thus, a method was established for determination of chromium in high-carbon ferro- chrome by inductively coupled plasma atomic emission spectrometry （ICP-AES）. Under the working con- ditions of instrument, the linear range of calibration curve was w（Cr） =40%-100%, and the linear correlation coefficient was r〉0. 999. The experimental method was applied to determination of the certified refer- ence materials, synthetic sample and actual sample of high-carbon ferrochrome. The results were basically consistent with the certified value, theoretical value or those obtained by standard method GB/T 4699.2- 2008. The relative standard deviation（RSD, n=6） was less than 1.0%.

关 键 词：高碳铬铁 铬 过氧化钠 碱熔 电感耦合等离子体原子发射光谱法 

分 类 号：TG115.33[金属学及工艺—物理冶金]