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Method for determining sodium chloride content in phosphate using spectrophotometry

A technology of spectrophotometry and sodium chloride, which is applied in measuring devices, analyzing materials, and analyzing materials through optical means. It can solve problems such as excessive chloride ions in boiler water, deterioration of soda quality, and inability to effectively control them. The method is simple , The effect of less instrument maintenance workload

Active Publication Date: 2007-11-28
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +1
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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the chlorine ions in the phosphate added in the boilers of the power plant cannot be effectively controlled, causing the chlorine ions in the boiler water to exceed the standard, resulting in the deterioration of the quality of soda and water, and increasing the sewage discharge rate. The spectrophotometric method for determining the content of sodium chloride in phosphate, which can quickly and accurately determine the content of sodium chloride in phosphate, achieves the purpose of controlling the quality of phosphate

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  • Method for determining sodium chloride content in phosphate using spectrophotometry
  • Method for determining sodium chloride content in phosphate using spectrophotometry
  • Method for determining sodium chloride content in phosphate using spectrophotometry

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[0023] Below in conjunction with example the present invention will be further described.

[0024] The present invention is aimed at the chloride ion in phosphate, in the solution containing chloride ion, chloride ion reacts with mercury thiocyanate, generates mercury chloride and releases SCN - ; In perchloric acid medium, Fe 3+ with SCN - Form a stable orange-red complex, the absorbance of this complex and the content of chloride ion are between 0~1.0CI - In the range of mg / L, there is a linear relationship. Draw (A-A 0 )-C straight line or the absorbance of the solution (A-A 0 ) and the concentration C to perform regression calculation, the regression equation is obtained: A-A 0 =a+bC.

[0025] First, take high-purity water, ferric nitrate-perchloric acid solution, mercury thiocyanate-methanol solution and chloride ion standard solution for use.

[0026] The high-purity water has an electrical conductivity less than 0.1 μs / cm; the ferric nitrate-perchloric acid solut...

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Abstract

The invention discloses a method of measuring sodium chloride content in phosphate by spectrophotometry, which solves the problem that chloride ion in phosphate added in utility boiler can not be controlled effectively so that steam and water quality is deteriorated. It is provided with convenient operation, easy operation and accurately measuring sodium chloride content in phosphate quickly so on. The method is that 0.2% of mixed solution of mercury thiocyanate and methyl alcohol is added in standard solution of chloride ion to generate mercuric chloride and release SCN-; then 0.15mol / L-2.5mol / L of mixed solution of mercury thiocyanate and perchloric acid is added to generate stable jacinth complex compound, of which absorbency A deducting blank absorbency A0, namely A-A0 and the chloride ion content has the smooth curve relation; on the curve linear relation chloride ion content is fetched in the range of 0-1000CI- mu g / L to build the equation of the absorbency (A-A0) and the chloride ion content C, namely (A-A0)=a+bC; after certain tri-sodium phosphate solution is fetched to measure absorbency blank absorbency is deducted; the standard curve is calculated or checked to obtain chloride ion content; then sodium chloride content in phosphate is obtained.

Description

technical field [0001] The invention relates to a method for determining the content of sodium chloride, in particular to a method for determining the content of sodium chloride in phosphate by spectrophotometry in a thermal power plant. Background technique [0002] At present, during the operation of the power plant, it is found that the pH value of the boiler water is low and the chloride ion content exceeds the standard. The main reason is that the chloride ion content in the phosphate is relatively high. Although some power plants have changed the quality of phosphate from industrial pure to analytical pure, the quality of phosphate cannot be guaranteed due to the large number of manufacturers and unstable product quality. In order to remove phosphate with high chloride ion content and add qualified phosphate, it is necessary to detect the chloride ion content in phosphate. For the determination of chloride ions in water, national standards and power industry standards...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/17G01N21/78G06F19/00
Inventor 周少玲高波田光松杨萍姜雨泽王璋侯亚琴
Owner ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY
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