摘要
本文以铂坩埚或高铝坩埚碱熔融分解试样,水浸取,在碱性介质中水浴除过氧化氢,盐酸酸化,以二苯胺磺酸钠为指示剂,用硫酸亚铁铵标准溶液滴定铬铁矿中的铬。经铬铁矿国家标准物质的验证,该方法的精密度和准确度较好(RSD%为0.06%~0.24%,n=12,RE%为0.08%~0.33%),适用于铬铁矿中高含量铬的日常分析。
In this paper, platinum crucible or high alumina crucible alkali melting melt decomposition sample, water extraction, removed hydrogen peroxide in the alkaline medium conditions, hydrochloric acid, sodium diphenylamine sultbnate as indicator, with ferrous ammonium sulfate standard solution to titrate the chromium in chromite. By the verification of the national standard substance of chromite, the precision and accuracy of the method are all good(RSD% 0.06 %-0.24 %, n=12, RE% 0.08 %-0.33 %), it applies to daily aalysis of high content chromium in chromite.
出处
《广东化工》
CAS
2017年第9期252-253,共2页
Guangdong Chemical Industry
关键词
铬铁矿
碱熔
铬
chromite
alkali melting
chromium