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Catalytic digestion column and its preparation method, cod cr Rapid measurement device and method of using the same

A cylinder and porous ceramic technology, applied in the environmental field, can solve the problems of expensive reagent materials, difficult conditions to control, long analysis cycle, etc., to avoid harm to the operator and the environment, high accuracy, easy to carry and use Effect

Active Publication Date: 2021-09-24
合肥净龙环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among these methods, some require more expensive instruments, some require expensive reagent materials, some are toxic, some are complicated to operate and the conditions are difficult to control, and some are susceptible to interference.
At the same time, these methods all need to be taken back to the laboratory for measurement after sampling, the analysis period is long, and errors will be caused by pollution or water quality changes during storage and transportation.

Method used

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  • Catalytic digestion column and its preparation method, cod <sub>cr</sub> Rapid measurement device and method of using the same
  • Catalytic digestion column and its preparation method, cod <sub>cr</sub> Rapid measurement device and method of using the same
  • Catalytic digestion column and its preparation method, cod <sub>cr</sub> Rapid measurement device and method of using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0120] a COD Cr The preparation of rapid assay device specifically comprises the following steps:

[0121] One, the preparation method of catalytic digestion column 1, its technological process sees Figure 5, including the following steps:

[0122] 1. Immerse 100g of 325-mesh diatomite in 0.5mol / L nitric acid solution containing 10% hydrogen peroxide by mass, heat and keep boiling slightly for 10 minutes, and separate solid and liquid to obtain diatoms after removing impurities and expanding pores earth;

[0123] Wash the diatomite after impurity removal and pore expansion to near neutrality, soak in the aqueous solution of chelating dispersant containing 100g / L urea, 10g / L acetic acid and 50g / L citric acid, ultrasonically vibrate for 20min, and place in a belt In the airtight container with the air release valve, vacuumize the container, the relative vacuum degree is -0.1MPa, keep it for 120min, open the air release valve, let the pressure in the container return to norma...

Embodiment 2

[0160] a COD Cr Preparation of Rapid Assay Device 2

[0161] One, the preparation method of catalytic digestion column 2, with embodiment 1, difference is:

[0162] (1) In step 2, the calcium nitrate tetrahydrate consumption is 9.46g;

[0163] (2) In step 3, the amount of tetra-n-butyl titanate is 13.61g;

[0164] (3) In step 5, get an appropriate amount of raw powder obtained in step 3, place the cone height 45mm, and the bottom surface diameter is 6mm in the conical mold body;

[0165] (4) In step 7, during the molding process of the column body of the catalytic digestion column, supplement the powder, after pressurization, the height of the column body in the mold is 56.8mm, demoulding, after roasting according to the method of Example 1, the length obtained is 55mm Catalytic digestion column column;

[0166] (5) In step 9, the catalytic digestion column 2 is obtained, and the apparent porosity of the column is 39%;

[0167] (6) In step 10, measure the liquid absorptio...

Embodiment 3

[0184] a COD Cr Preparation of Rapid Assay Device 3

[0185] One, the preparation method of catalytic digestion column 3, with embodiment 1, difference is:

[0186] (1) In step 2, the amount of calcium nitrate tetrahydrate taken is 7.08g;

[0187] (2) In step 3, under vigorous stirring, the amount of tetra-n-butyl titanate to be used is 10.21 g;

[0188] (3) In step 5, the conical mold adopts a cone height of 50mm, and the bottom surface diameter is 8mm;

[0189] (4) In step 6, get 5 cotton threads that adsorb tetra-n-butyl titanate and strontium nitrate obtained in step 4, and the distance between the cotton thread and the upper intersection point of the cone bottom surface circumference is 5mm;

[0190] (5) In step 7, the inner diameter of the mold body of the catalytic digestion column is 11mm, pressurized, and after supplementing the powder, the height of the column body is 62mm, and after calcining according to the method of Example 1, a catalytic digestion column with...

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Abstract

A catalytic digestion column and its preparation method, COD Cr A rapid measuring device and its usage method belong to the field of environmental technology. In this method, the prepared catalytic digestion column and chromogenic determination column are assembled into a digestion analyzer, and the COD is obtained by combining the material bottle. Cr Rapid determination device; when in use, the water sample to be tested penetrates into the micropores of the catalytic digestion column, and then the digestion solution is introduced into the catalytic digestion column. Under the action of the catalyst, the hexavalent chromium oxidizes the organic matter in the water and is reduced to Cr 3+ ; After cleaning, only the remaining hexavalent chromium is adsorbed in the catalytic digestion column, and then add the indicator to react with the hexavalent chromium, so that the indicator fades, and penetrates and distributes on the surface of the color measuring column. By comparing with the color comparison card, directly Determination of water sample COD Cr value. The assay device prepared by this method realizes COD Cr On-site rapid determination without interference, the process does not require expensive and highly toxic reagents such as silver sulfate and mercury sulfate, the device can be reused, and the determination cost is low.

Description

technical field [0001] The invention belongs to the field of environmental technology, in particular to a catalytic digestion column and its preparation method, COD Cr Rapid assay device and its usage. Background technique [0002] Chemical Oxygen Demand (COD for short) refers to the amount of oxidant consumed to oxidize reducing substances in 1 liter of water sample under certain conditions, expressed in mg / L of oxygen. It is one of the important indicators to evaluate the degree of organic pollution of water bodies, and is the most commonly measured item in water quality monitoring. According to different oxidants, chemical oxygen demand can be divided into COD Cr and permanganate index. Among them, COD Cr The most widely used, for COD Cr The standard analysis method for determination is the open tube reflux-potassium dichromate oxidation-ferrous sulfate ammonium titration method (HJ 828-2017), that is, adding potassium dichromate, concentrated sulfuric acid and silve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/78
CPCG01N21/78
Inventor 张东王经权张艳丽李海泓辛颖毕椿基
Owner 合肥净龙环保科技有限公司
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