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Analytical method of iodine-containing hydriodic acid concentration

An analysis method, the technology of hydroiodic acid, applied in the field of electrochemical and chemical analysis, can solve the problems of poor repeatability, cumbersome operation, time-consuming process, etc., achieve accurate analysis results, overcome cumbersome operation, and convenient and fast data collection

Active Publication Date: 2013-04-17
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] The object of the present invention is to provide a kind of analysis method that contains iodine hydroiodic acid concentration, to overcome the disadvantages such as complex operation, time-consuming process, poor repeatability when adopting traditional chemical titration to carry out concentration analysis to iodohydriodic acid

Method used

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Embodiment 1

[0043] Density measurements were carried out with an Anton Paar DMA 4100M U-tube oscillating density meter. The electrolysis-electrodialysis cell adopts DuPont's Nafion 117 proton exchange membrane, which separates the cathode and anode. The distance between the cathode and anode electrodes is 2mm, and the effective exchange area of ​​the electrolysis-electrodialysis cell is 25cm 2 . The electrolysis-electrodialysis cell is equipped with a temperature controller, a constant current DC power supply and a voltmeter for measuring cell voltage. Prepare HI:I 2 :H 2 The molar ratio of O is 1:0.2~4.0:4.0~13. A series of iodine-containing hydroiodic acid standard samples with different concentrations in the range of 1:0.2~4.0:4.0~13 are measured by the aforementioned U-tube oscillating density meter at normal pressure and 80°C. Density value; Under normal pressure and constant current conditions, measure the cell voltage value of the above-mentioned standard samples when they flow ...

Embodiment 2

[0051] As listed in the table below, for 5 # and 6 # Contain iodohydriodic acid sample to be measured and carry out concentration analysis, under normal pressure, adopt measuring cylinder to take the sample of certain quality, and read out the volume of sample taken by weighing, thereby calculate density, and with the constant current described in embodiment one Electrolysis-electrodialysis cell and its conditions, carried out 5 # and 6 #样 Determination of the cell voltage value when the product flows through the constant current electrolysis-electrodialysis cell. According to the obtained density value and the cell voltage value when the sample flows through the constant current electrolysis-electrodialysis cell, according to the mathematical relationship obtained in Example 1, calculate 5 # and 6 # concentration of the sample. As a comparison, the table also lists the 5 # and 6 # The concentration of the No. sample.

[0052]

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Abstract

The invention relates to an analytical method of iodine-containing hydriodic acid concentration, and belongs to the fields of electrochemistry and analytical chemistry. The analytical method disclosed by the invention comprises the following steps: performing analysis by adopting a density measurement device and a constant current electrolysis-electrodialysis cell, and firstly establishing a mathematical relation formula among material concentration and the material density of an iodine-containing hydriodic acid standard sample, as well as a cell voltage value when material flows through the constant current electrolysis-electrodialysis cell; and determining the density of an iodine-containing hydriodic acid sample to be determined and the cell voltage value thereof when the iodine-containing hydriodic acid sample flows through the constant current electrolysis-electrodialysis cell, and determining the specific concentration of the sample to be determined from the mathematical relation. By adopting the method disclosed by the invention, the accuracy is higher, and the shortcomings of trivial operation, time-consuming process, poor repeatability and the like of a conventional titration analytical method can be overcome.

Description

technical field [0001] Especially relate to a kind of iodohydriodic acid (being hydrogen iodide-iodine-water ternary solution, HI-I 2 -H 2 The concentration analysis method of O) belongs to the technical field of electrochemical and chemical analysis. Background technique [0002] Iodohydriodic acid feed solution (i.e. hydrogen iodide-iodine-water ternary solution, HI-I 2 -H 2 The component analysis operation of O) is used in daily laboratory analysis, thermochemical iodine-sulfur cycle decomposition water hydrogen production process, and hydroiodic acid production process. Taking the thermochemical iodine-sulfur cycle splitting water hydrogen production process as an example, in the iodine-sulfur cycle hydrogen production process, the hydroiodic acid generated by the Bunsen reaction forms HI-I due to the addition of excess iodine. 2 -H 2 O phase, accurately determine HI-I 2 -H 2 The concentration of each component in O is very important to the research of related pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N9/36G01N27/403
Inventor 陈崧哲张平王来军徐景明
Owner TSINGHUA UNIV
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