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Method for measuring KHP (potassium hydrogen phthalate) content by turbidity compensation ultraviolet-visible spectrophotometry

A visible light and photometric technology, which is used in the field of potassium hydrogen phthalate concentration measurement in water and UV-Vis photometric determination of KHP content, can solve the problem of high cost of multi-spectral measurement, low compensation accuracy of dual-wavelength method, and single-wavelength measurement. problems such as large errors, to achieve the effect of good repeatability, reducing influence and improving measurement accuracy

Active Publication Date: 2017-09-15
HARBIN ENG UNIV
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[0006] The purpose of the present invention is to provide a kind of ultraviolet - Method for measuring KHP content by visible light photometry

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  • Method for measuring KHP (potassium hydrogen phthalate) content by turbidity compensation ultraviolet-visible spectrophotometry
  • Method for measuring KHP (potassium hydrogen phthalate) content by turbidity compensation ultraviolet-visible spectrophotometry
  • Method for measuring KHP (potassium hydrogen phthalate) content by turbidity compensation ultraviolet-visible spectrophotometry

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[0029] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0030] The present invention uses the double light source ultraviolet-visible photometer of central wavelength 255nm ultraviolet light and central wavelength 532nm green light to measure the mixed solution of KHP standard solution and turbidity standard solution, and its total absorbance to ultraviolet light is equal to turbid liquid and KHP respectively to ultraviolet The sum of the absorbance contributions of light, where the green light source is used to compensate for turbidity. The outgoing light after passing through the solution is detected by two Si photodetectors, and the light signal is converted into an electrical signal, and then a narrow-band filter and an autocorrelation detection method are used to obtain the absorbance of the sample solution for ultraviolet light and green light. The absorbance of KHP solution to ultra...

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Abstract

The invention provides a method for measuring KHP (potassium hydrogen phthalate) content of water by ultraviolet-visible spectrophotometry. An ultraviolet-visible photometer with dual light sources of ultraviolet light and green light is used for measuring mixed solution of KHP standard solution and turbidity standard solution, the central wavelength of the ultraviolet light is 255 nanometers, the central wavelength of the green light is 532 nanometers, the total absorbance of the ultraviolet light is equal to the sum of absorbance contribution of turbidity solution and KHP for the ultraviolet light, and the green light source functions in turbidity compensation. Two Si photoelectric detectors are used for detecting emergent light passing the solution, light signals are transformed into electric signals, and a narrow-band filter and an autocorrelation detection method are used to obtain the absorbance of sample solution for the ultraviolet light and the green light. Turbidity compensation is performed by an ultraviolet light absorbance-turbidity standard regression line equation and a green light absorbance-turbidity standard regression line equation to calculate the absorbance of KHP solution for the ultraviolet light, and the accurate content of KHP in the solution is calculated by an ultraviolet light absorbance-KHP concentration standard curve.

Description

technical field [0001] The invention relates to a method for measuring potassium hydrogen phthalate (KHP) concentration in water, in particular to a method for measuring KHP content by ultraviolet-visible light photometry for turbidity compensation, and belongs to the technical field of o-benzene content detection and analysis. Background technique [0002] With the development of economy and society, the problem of environmental pollution exposed to our country is also becoming more and more serious. According to the survey report of the World Health Organization, in developing countries, more than 70% of diseases are related to water pollution; at the same time, water pollution is harmful to workers. The impact of agriculture also directly or indirectly affects people's health and livelihood. [0003] Phthalates are common organic pollutants in water, and KHP is often used as a standard substance for chemical oxygen demand because of its stable chemical properties. At pre...

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Application Information

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IPC IPC(8): G01N21/31G01N21/33
CPCG01N21/31G01N21/33G01N2201/127G01N2201/12746
Inventor 张晓峻王文王琛贾正强程鹏孙晶华
Owner HARBIN ENG UNIV
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