Determination of Hexavalent Chromium in Refractories by Diphenylcarbazide Spectrophotometry

• 作者: FU Yuanyuan HAN Junhua CAO Haijie LEI Xiaoyu HAN Dan XU Xiaoying
• 来源期刊: 中国耐火材料（英文版）
• 年，卷（期）: 2021,（3）
• 页码范围: 28-32
• 页数: 5页
• 语种: 英文
• DOI: 10.19691/j.cnki.1004-4493.2021.03.006

摘要

The high chrome refractories were crushed,ground into powder and sampled.A mixture solution of sodium carbonate and sodium hydroxide was used to extract the powder samples.The extracted solution from the samples was mixed and reacted with diphenylcarbazide to form colored substance.The hexavalent chromium content in the samples was determined by spectrophotometry.The effects of the extracting conditions,the color reagent reaction conditions,the sample mass,the working curve and the trivalent chromium coexistence on the results were studied.The experiments about determination,recovery and precision were carried out.The relative standard deviation was less than 5％ and the recovery rate was 98％-104％.