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Method for measuring permanganate index with phenanthroline-ferrous ion color development method and application

A permanganate index, phenanthroline technology, applied in the measurement of color/spectral properties, material analysis by observing the effect on chemical indicators, and analysis by chemical reaction of materials, etc., can solve the problem of display substances. High sensitivity, measurement error of permanganate index, cumbersome operation process, etc., to achieve the effect of simple and convenient operation, no side reaction and strong anti-interference ability

Inactive Publication Date: 2015-07-22
北京连华永兴科技发展有限公司
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Problems solved by technology

However, due to the high sensitivity of the display substance generated in this method, it needs to be diluted before measuring the absorbance, so the operation process is relatively cumbersome, and the method needs to introduce the metering method of sodium nitrite, and the amount of sodium nitrite is taken The error will directly cause the measurement error of the permanganate index

Method used

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  • Method for measuring permanganate index with phenanthroline-ferrous ion color development method and application
  • Method for measuring permanganate index with phenanthroline-ferrous ion color development method and application
  • Method for measuring permanganate index with phenanthroline-ferrous ion color development method and application

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Embodiment 1

[0032] 1. Establishment of working curve and error analysis

[0033] 1.1. Establishment of working curve

[0034] Preparation of standard sample: Accurately weigh 0.315 g of anhydrous glucose dried at 103°C for 2 hours, dissolve in distilled water and transfer to a 500ml volumetric flask to constant volume. Then absorb 10.00ml of the solution and set the volume to 1000ml; wherein: the distilled water is distilled water without reducing substances.

[0035] Take 5ml of water sample from the colorimetric tube, add 0.5ml (1+7) sulfuric acid to make it acidic, then add 0.5ml of potassium permanganate solution with a concentration of 0.01mol / l, and then heat the water sample in a water bath at 100°C After digesting for 30 minutes, cool down rapidly to room temperature, then reduce the remaining potassium permanganate in the digestion solution with 0.5ml concentration of ferrous ammonium sulfate solution of 0.01mol / l, assuming that 0.01mol / l potassium permanganate solution (0.5ml ...

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Abstract

The invention discloses a method for measuring a permanganate index with a phenanthroline-ferrous ion color development method. The method comprises the following steps: (1) adding a to-be-measured water sample into a colorimetric tube provided with a plug, adding (1+7) sulfuric acid for acidification, adding a potassium permanganate solution, and shaking uniformly; (2) digesting the water sample in the step (1) under a certain condition and quickly cooling to a room temperature; (3) adding an ammonium ferrous sulfate solution into a digestion solution in the step (2), and shaking uniformly; (4) adding a phenanthroline-sodium acetate aqueous solution into a reaction solution in the step (3) for adjusting the pH (potential of hydrogen) value of a system to be 3-5, and producing a color development reaction; (5) performing absorbance testing on the water sample in the step (4) by zero setting of a reference solution at the wavelength of 510 nm, and calculating the permanganate index of the water sample by a formula IMn=7.666A-0.012, wherein in the formula, IMn is the permanganate index of the water sample and A is the absorbance of the water sample. The measurement method is high in color development reaction selectivity, strong in anti-jamming capability, complete in reaction and simple and convenient to operate.

Description

technical field [0001] The invention relates to a detection method of water quality, in particular to a method for measuring the permanganate index of water by using the principle that ferrous ions react with o-phenanthroline to generate an orange complex. In addition, the invention also relates to Application of the determination method in water quality detection. Background technique [0002] The permanganate index refers to the amount of oxidant consumed to oxidize reducing substances in the water body with potassium permanganate as the oxidant under certain conditions, expressed in mg / l of oxygen (O2, mg / l). Permanganate index, as a comprehensive indicator for judging water body pollution by organic matter and reducing inorganic matter, is suitable for detecting the pollution degree of surface water, ground water, drinking water, etc. At present, the determination of permanganate index mostly uses sodium oxalate as a reducing agent, titrates excess sodium oxalate with p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78G01N21/31
Inventor 纪国梁纪鹏纪飞雒小龙陈利军裴丽明孙阔
Owner 北京连华永兴科技发展有限公司
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