Method for determining COD of pot bottom water through rapid unsealed catalytic digestion

A bottom pot water, non-sealed technology, applied in the measurement of color/spectral characteristics, etc., can solve the problem of inappropriate bottom pot water, and achieve the effect of overcoming the limitation of measurement range, overcoming danger, and improving work efficiency

Inactive Publication Date: 2015-11-18
ANHUI GUJING DISTILLERY +1
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Problems solved by technology

However, the existing COD determination method is not suitable for this kind of liquor industrial bottom pot water. According to the particularity of the bottom pot water quality, the chemical oxygen demand measurement method needs to be improved.

Method used

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  • Method for determining COD of pot bottom water through rapid unsealed catalytic digestion

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Embodiment Construction

[0037] 1. Reagents and materials

[0038] Unless otherwise specified, the reagents used in this method should be analytically pure chemical reagents that meet national standards, and the experimental water should be freshly prepared deionized water or distilled water.

[0039] 1) Water: It should meet the relevant requirements of GB / T6682 first-class water.

[0040] 2) (1+9) sulfuric acid solution: Slowly add 100ml of concentrated sulfuric acid with a concentration of 1.84g / mL into 900ml of water along the beaker wall, stir and mix well to obtain (1+9) sulfuric acid solution, cool it for later use.

[0041] 3) ρ(HgSO 4 )=0.20g / ml mercury sulfate solution:

[0042] Weigh 20g of mercuric sulfate and dissolve it in (1+9) sulfuric acid solution, set the volume to 100ml, shake well, and dissolve it fully (if it is insoluble, heat it slightly on an electric stove to dissolve it), and set aside the mercuric sulfate solution.

[0043] 4)c(1 / 6K 2 Cr 2 o 7 )=0.512mol / L potassium d...

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Abstract

The invention discloses a method for determining the COD of pot bottom water through rapid unsealed catalytic digestion. The method comprises the following steps: carrying out unsealed catalytic digestion on a series of COD standard working solutions, and determining the absorbance of every digestion solution to obtain a standard curve with the absorbance as abscissa and the COD concentration as ordinate; and diluting pot bottom water to be determined, carrying out unsealed catalytic digestion on the diluted pot bottom water to be determined, determining the absorbance, and comparing the absorbance with the standard curve to obtain the concentration of COD in the pot bottom water. The determination range of the method is 25-1000mg / L, the corresponding concentration of the undiluted pot bottom water is 5000-100000mg / L, and method overcomes restriction of a determination range, so the experiment complexity is reduced, and the working efficiency is improved; and the unsealed catalytic digestion is carried out, so danger of closed catalytic digestion experiment is overcome.

Description

1. Technical field [0001] The invention relates to the field of COD determination methods, in particular to a rapid non-closed catalytic digestion spectrophotometry. 2. Background technology [0002] The standard method for the determination of chemical oxygen demand is represented by the Chinese standard GB / T11914 "Dichromate Method for Determination of Chemical Oxygen Demand in Water Quality". This method has high oxidation rate, good reproducibility, accuracy and reliability, and has become generally recognized by the international community. Classic standard method. However, this classic standard method still has shortcomings. The reflux device takes up a lot of experimental space, consumes a lot of water and electricity, consumes a lot of reagents, is inconvenient to operate, is difficult to quickly measure in large quantities, and cannot meet the requirements of environmental monitoring. [0003] At present, there are many methods for rapid determination of chemical o...

Claims

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Application Information

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IPC IPC(8): G01N21/31
Inventor 李安军万春环王录张良东卢闪闪李艳
Owner ANHUI GUJING DISTILLERY
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