西南石油大学学报(自然科学版) ›› 2001, Vol. 23 ›› Issue (3): 67-68.DOI: 10.3863/j.issn.1000-2634.2001.01.020

• 油气化学工程与化工 • 上一篇    下一篇

二氧化硫标准溶液的直接标定法

陈集 饶小桐 王立娟
  

  1. 西南石油学院化学化工学院,四川 南充 637001
  • 收稿日期:2000-09-18 修回日期:1900-01-01 出版日期:2001-08-20 发布日期:2001-08-20
  • 通讯作者: 陈集

DIRECT STANDARDIZATION METHOD FOR SULFUR DIOXIDE STANDARD SOLUTION

CHEN Ji RAO Xiao-tong WANG Li-juan
  

  1. Southwest Petroleum Inst, Nanchong Sichuan 637001, China
  • Received:2000-09-18 Revised:1900-01-01 Online:2001-08-20 Published:2001-08-20
  • Contact: CHEN Ji

摘要: 提出了一种标定SO2标准溶液浓度的新方法—用Na2SO3标准溶液直接滴定由KIO3与过量KI反应所生成的I2。该方法与标准法相比,省略了稳定性较差的Na2S2O3溶液的配制和标定操作,不用易挥发损失的I2溶液,缩短了分析时间,降低了分析成本。它的反应条件较宽松,精密度高,CV≈0.082%,标定结果与标准法无显著性差异,RE<±0.4%,是一种值得提倡的方法。

关键词: 二氧化硫, 亚硫酸钠, 环境监测, 标定

Abstract: A new method of standardizing sulfur dioxide standard solution has been presented, in which iodine that is derived from the reaction of KIO3with excess KI istitrated directly.Comparing with standard methods, the new way does not need to prepare and standardize the unstable Na2S2O3solution and use
volatile I2. As a result, the analytical time is shortened and the cost is reduced. The reaction condition is easy to reach and the method has high accuracy (CV≈0.082%, RE<±0.4%).It is a method that is worth recommending.

Key words: sulfur dioxide, sodium sulfite, environmental monitoring, standardization

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