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Method for measuring dithionite by potassium ferricyanide differential spectrophotometry

A dithionite and spectrophotometry technology, applied in the measurement of color/spectral characteristics, etc., can solve the problem of large minimum detection limit, and achieve the effect of ensuring sensitivity and accuracy, accurate standard curve, and small error

Inactive Publication Date: 2020-02-14
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, in the traditional titration method, in addition to the formaldehyde titration method, some researchers also use potassium ferricyanide titration for dithionite detection, but there is still the problem of a relatively large minimum detection limit, so the development of potassium ferricyanide spectroscopic It is theoretically feasible and operable to determine low-concentration dithionite by photometry

Method used

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  • Method for measuring dithionite by potassium ferricyanide differential spectrophotometry
  • Method for measuring dithionite by potassium ferricyanide differential spectrophotometry
  • Method for measuring dithionite by potassium ferricyanide differential spectrophotometry

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Embodiment 1

[0036] The present embodiment provides a method for measuring dithionite by potassium ferricyanide differential spectrophotometry, comprising the steps of:

[0037] S1: Add 5mL of sodium hydroxide solution with a concentration of 1mol / L into a 50mL stoppered colorimetric tube, and then continue to add 4mL of potassium ferricyanide solution with a concentration of 10mmol / L, and record it as mixed solution A 0 ; Finally, the mixture A was mixed with deionized water 0 Set the volume to 50mL, and record the absorbance at the characteristic absorption wavelength of 419nm as a 0 Add respectively 0.03, 0.05, 0.1, 0.2, 0.4, 0.6, 0.8, 1.0, 1.5mL concentration to 10 50mL colorimetric tubes with stoppers that mixed solution A is equipped with and be 20mmol / L sodium dithionite standard use solution, Dilute to the 50mL mark with deionized water, shake and shake well, react at 25°C for 40min, measure the absorbance value of the reaction mixture in each colorimetric tube at the characterist...

Embodiment 2

[0043] The present embodiment provides a method for measuring dithionite by potassium ferricyanide differential spectrophotometry, comprising the steps of:

[0044] S1: Add 5mL of potassium hydroxide solution with a concentration of 1mol / L into a 50mL stoppered colorimetric tube, and then continue to add 4mL of sodium ferricyanide solution with a concentration of 10mmol / L, and record it as mixed solution A 0 ; Finally, the mixture A was mixed with deionized water 0 Set the volume to 50mL, and record the absorbance at the characteristic absorption wavelength of 419nm as a 0 ; Add 0.05, 0.1, 0.2, 0.4, 0.6, 0.8, 1.0, 1.5, 2.5, 3.0mL of 20mmol / L magnesium dithionite to 10 50mL stoppered colorimetric tubes equipped with mixed solution A For the standard solution, dilute it to the 50mL mark with deionized water, shake it well, react at 50°C for 60min, and measure the absorbance value of the reaction mixture in each colorimetric tube at the characteristic absorption wavelength of 41...

Embodiment 3

[0050] The present embodiment provides a method for measuring dithionite by potassium ferricyanide differential spectrophotometry, comprising the steps of:

[0051] S1: Add 1mL sodium hydroxide solution with a concentration of 1mol / L into a 50mL stoppered colorimetric tube, and then continue to add 1mL potassium ferricyanide solution with a concentration of 10mmol / L, and record it as mixed solution A 0 ; Finally, the mixture A was mixed with deionized water 0 Set the volume to 50mL, and record the absorbance at the characteristic absorption wavelength of 419nm as a 0 Add 0.05, 0.25, 0.5, 1.0, 1.25, 1.5mL standard solution of 20mmol / L sodium dithionite to 10 50mL stoppered colorimetric tubes equipped with mixed solution A, and dilute to volume with deionized water After reaching the 50mL marked line, shake and shake well, react at 25°C for 40min, measure the absorbance value of the reaction mixture in each colorimetric tube at the characteristic absorption wavelength of 419nm,...

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Abstract

The invention discloses a method for measuring dithionite by potassium ferricyanide differential spectrophotometry, which aims at the problems that in the prior art, when the content of dithionite ismeasured by use of a potassium ferricyanide differential titration method, the detection limit is high, and the detection requirement of low-concentration dithionite cannot be met. The method comprises the following steps: (1) adding an alkaline substance to enable a reaction to occur under an alkaline condition; (2) sequentially adding a potassium ferricyanide solution and a dithionite sample tobe measured into the alkaline substance, oscillating and shaking to enable the substances to react fully; and (3) detecting a difference value between absorbance values before and after the sample tobe measured is added through spectrophotometry, substituting the difference value into a standard curve equation, and calculating to obtain the content of the dithionite in the sample to be measured.According to the method of the invention, the content of the sample to be measured is reflected through the absorbance change of the potassium ferricyanide after being reduced and consumed by the dithionite under alkaline conditions, thus the method has accurate measurement result, wide detection range and small instrument limiting factor, and is convenient for conventional laboratories to use.

Description

technical field [0001] The invention relates to a method for detecting the content of chemical substances, in particular to a method for measuring dithionite by potassium ferricyanide differential spectrophotometry. Background technique [0002] Dithionite, also known as hyposulfite, hyposulfite, molecular formula S 2 o 4 2- , because its structure consists of two SO 2 - It is named after the special S-S bond and is a strong reducing agent. Because dithionite has a larger S-S bond length and weaker bond energy, it is more prone to bond breakage and disproportionation reaction to generate other sulfur-containing compounds such as sulfite and thiosulfate, while dithionite reduction The ability is between the two, and the redox potential is about -1.12V. Therefore, its strong reducing ability is often applied to the advanced redox degradation of organic pollutants in the environment. [0003] Sodium dithionite is widely used in environmental treatment due to its cheap, a...

Claims

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Application Information

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IPC IPC(8): G01N21/31
CPCG01N21/31
Inventor 李继宋伟张小磊付彩霞王卓悦宋祺杨威
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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