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Catalytic digestion column and preparation method thereof, CODCr rapid measuring device and using method thereof

A technology of measuring column and measuring device, applied in the environmental field, can solve the problems of complicated operation, easy to be interfered, and toxic reagents, etc.

Active Publication Date: 2019-09-06
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 preparation method thereof, CODCr rapid measuring device and using method thereof
  • Catalytic digestion column and preparation method thereof, CODCr rapid measuring device and using method thereof
  • Catalytic digestion column and preparation method thereof, CODCr rapid measuring device and using method thereof

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 normal...

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 10.21g;

[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

The invention belonging to the technical field of environment discloses a catalytic digestion column and a preparation method thereof, a CODCr rapid measuring device and a using method thereof. According to the method, a prepared catalytic digestion column and a chromogenic measuring column are assembled into digestion measuring equipment, and a CODCr rapid measuring device is obtained by combining a material bottle. When the CODCr rapid measuring device is in use, a to-be-measured water sample infiltrates and enters a micropore of the catalytic digestion column; a digestion solution is injected into the catalytic digestion column; under the effect of a catalyst, an organic matter in water is oxidized by hexavalent chromium and then Cr<3+> is obtained by reduction; after cleaning, only thehexavalent chromium is adsorbed in the catalytic digestion column, an indicator is added to react with the hexavalent chromium, color fading of the indicator is performed and the processed indicatorinfiltrates and is distributed on the surface of the chromogenic measuring column; and on the basis of contrast to a colourimetric card, a CODCr value of the water sample is directly determined. Withthe measuring device prepared by the method, the field rapid measurement of the CODCr is realized without interference; no expensive and highly toxic reagents such as silver sulfate and mercury sulfate are needed in the process; and the device can be used repeatedly and the measurement 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 Applications(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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