Method for determining sodium chloride content in phosphate using spectrophotometry

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...

AI Technical Summary

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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