范丽新,汤淑芳.EDTA滴定法测定再生锌原料中的锌含量[J].中国无机分析化学,2019,9(1):47-53.
EDTA滴定法测定再生锌原料中的锌含量
Determination of zinc content in regenerated zinc material by EDTA
投稿时间:2018-08-11  修订日期:2019-01-20
DOI:
中文关键词:  滴定法  再生锌原料  
英文关键词:titration method  regenerated zinc material  zinc
基金项目:国家重大科学仪器设备开发专项工业过程在线分析检测仪器开发与应用(2016YFF0102500)
     
作者单位
范丽新 北矿检测技术有限公司
汤淑芳 北矿检测技术有限公司
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中文摘要:
      采用氟化铵-盐酸-硝酸-硫酸分解,氨水沉淀分离铁、锰、铅等共存元素,滤液中加入掩蔽剂掩蔽少量干扰元素,在pH 5~6的乙酸-乙酸钠缓冲溶液中,以二甲酚橙为指示剂,用EDTA标准滴定溶液滴定。测得结果为锌、镉合量,扣除镉量,即为锌量。试验方法用于测定再生新原料中锌,结果的相对标准偏差(RSD,n=11)为0.15%~1.03%。按照实验方法对分银渣样品进行加标回收试验,回收率为99.1%~101.6%。能满足日常对再生锌原料中锌含量的检测要求。
英文摘要:
      The new determination method of zinc in regenerated raw material is established. Sample is decomposed by ammonium fluoride-hydrochloric acid-nitric acid-sulfuric acid, and the coexisting elements such as iron, manganese and lead are separated by ammonia water precipitation. A small amount of interfering elements were masked by adding a masking agent to the filtrate, and the zinc in the filtrate was titrated with EDTA standard titration solution in an acetic acid-sodium acetate buffer solution of pH 5-6, using xylenol orange as an indicator. The measured results combined with the amount of zinc and cadmium, and the amount of zinc is obtained by deduction the amount of cadmium. The relative standard deviations(RSD, n=11) of determination result were between 0.15% and 1.03%.The recoveries in samples of silver slag were between 99.1% and 101.6%.This method could meet the requirements of daily analysis of zinc content in regenerated zinc material.
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