微波溶样-自动电位滴定法测定铬矿石中三氧化二铬.pdf

2011年2月
岩矿测试
Vol 30, No
Fcbrary 201]
ROCK AND MINERAL ANALYS
83~86
,,,二二
文章编号:0254-5357(2011)01-0083-04
徽波溶样-自动电位滴定法测定铬矿石中三氧化二铬
胡徳新,马徳起,苏明跃,王虹,姚传刚
天津出人境检验检疫局化矿金检测中心,天津300456)
摘要:样品经硫酸一磷酸一氟硼酸分解,在30~60kPa条件下进行徽波溶样,用自动电位滴定仪测定铬矿石中三
氧化二絡的含量。对两个不同三氧化二铬含量的铬矿石国家一级标准物质测定20次,测定的平均值与标准值的
相对误差为0.015%~0.021%,相对标准偏差为0.09%~0.10%。选取主要进ロ国的不同含量的铬矿石进行主
含量的测定,与经典法对比,分析结果均在合理允差范国之内。方法具有简便、快速、低耗、污染小等优点,可应用
于大批铬矿石样品的分析及检测。
关键词:三氧化二終;铬矿石;自动电位滴定法;徽波消解
中图分类号:0657.1;0652.4;P575;0614.611
文献标识码:B
Determination of Chromium Oxide in Chrome Ores by Automatic
Potentiometric Titrimetry with Microwave Digestion Sample Preparation
HU De-xin, MA De-gi, SU Ming-yue, WANG Hong, YAO Chuan-gang
Minerals and Metallic Materials Inspection Center of Tianjin Entry-exit Inspection and
Quarantine Bureau, Tianjin 300456, China)
Abstract. A method for the determination of C
r2 0: In Chrome ores
by automatic potentiometric titrimetry technology
coupled with microwave digestion under high-pressure was developed. The method has been tested by determination of
Cr, 0; in 2 Nalional Standard Reference chrome ore samples with wide range of Cr 03 contents. The results were in
agreement with certified values with relative error of 0.015-0.021% and the precision of.09-0102% RSD
(n=20 ). Six imported inspection samples were also tested by the method and the results were in accordance with those
from classical method. The method provides the advantages of low energy consumption, low labor intensity, high
efficiency and is suitable for the daily inspection work
Key words: chromium oxide; chrome ore; automatic potentiometric titrimetry; microwave digestion
我国是全球最大的铬矿石进口国,2009年全国进的伤害和污染。微波溶样是一种快速消解试样的新技
口铬矿石676万吨。铬矿石中Cr2O2的含量对铬矿石术,近年来将微波消解仪与实验室常用仪器联用,达到
烧结和治炼都有着直接的影响,国内各进络矿石贸更好、更快、更准确的检测效果1?。与化学分析方法
易商均在贸易合同中将主含量放在规格要求的第
相比,微波溶样结合自动电位滴定法测定铬矿石中
位。由于铬矿石采用常规酸溶法难达到较好的效果,Cr2O3含量能缩短检测周期,节约检测成本,减少了实
故目前各检测机构均采用过氧化钠碱熔法];但该验过程中对实验人员的依赖。目前,已有文献报道将
方法检测周期长,在检测过程中易造成对人员及环境微波消解一自动电位滴定法应用于铁矿石主含量及微
收稿日期:20105-10;修订日期:2010-08-20
作者简介:胡徳新(1980-),男,安徽安庆人,工程师,主要从事矿产品的检测工作。E-mail:hudx@Ciq.gov.cn