Method for fast slaking chemical oxygen demand in water quality testing in photometric analysis

A technology for chemical and photometric analysis of water quality, applied in the measurement of color/spectral properties, measuring devices, analytical materials, etc. It can solve the problems of inability to use online monitoring, high operating costs, and long digestion time, so as to reduce analysis costs and ensure accuracy. temperature, and the effect of increasing the digestion temperature

Active Publication Date: 2007-03-07
BOHAI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The current potassium dichromate oxidation-photometric analysis method water quality chemical oxygen demand (COD Cr ) On-line automatic monitors generally use expensive silver sulfate as a catalyst, resulting in high operating costs; while using sulfuric acid to adjust acidity and digestion temperature, the digestion temperature is 100-140 ° C, and the digestion time is 1-2 hours. Due to the long digestion time , cannot be used for online monitoring

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] According to H 2 SO 4 with H 3 PO 4 The volume ratio of 3:1 to 5:1 takes concentrated H 2 SO 4 and concentrated H 3 PO 4 , to prepare mixed acid H 2 SO 4 -H 3 PO 4 , according to MnSO 4 with CuSO 4 The weight ratio of 1:1 ~ 1:3, the preparation of catalyst MnSO 4 -CuSO 4 , add catalyst MnSO in 100ml mixed acid 4 -CuSO 4 and oxidant K 2 Cr 2 o 7 , the catalyst MnSO 4 -CuSO 4 The addition amount is 0.25 ~ 0.40 grams, the oxidant K 2 Cr 2 o 7 The concentration of the solution is 0.10-0.25mol / L to prepare the digestion solution; according to the volume ratio of sewage to digestion solution 1:2-1:3, the digestion solution is added to the sewage for digestion. The digestion temperature is 150-170°C. The time is 10 to 20 minutes, using a photometer or water quality chemical oxygen demand (COD Cr ) online monitor through Cr 3+ The absorbance of 590-610nm light is used to measure the chemical oxygen demand of water quality.

Embodiment 2

[0014] According to H 2 SO 4 with H 3 PO 4 Take concentrated H at a volume ratio of 5:1 2 SO 4 and concentrated H 3 PO 4 , to prepare mixed acid H 2 SO 4 -H 3 PO 4 , according to MnSO 4 with CuSO 4 The weight ratio of 1:1, the preparation catalyst MnSO 4 -CuSO 4 , add catalyst MnSO in 100ml mixed acid 4 -CuSO 4 and oxidant K 2 Cr 2 o 7 , the catalyst MnSO 4 -CuSO 4 The addition amount is 0.25 grams, the oxidizing agent K 2 Cr 2 o 7 The concentration of the solution is 0.10mol / L, and the digestion solution is prepared; according to the volume ratio of sewage and digestion solution 1:2, the digestion solution is added to the sewage for digestion. The digestion temperature is 150-170°C, and the digestion time is 10-20min. Use a photometer or water quality chemical oxygen demand (COD Cr ) online monitor through Cr 3+ The absorbance of 590nm light is used to measure the chemical oxygen demand of water quality.

Embodiment 3

[0016] According to H 2 SO 4 with H 3 PO 4 The volume ratio is 3:1 to take concentrated H 2 SO 4 and concentrated H 3 PO 4 , to prepare mixed acid H 2 SO 4 -H 3 PO 4 , according to MnSO 4 with CuSO 4 The weight ratio of 1:3, the preparation catalyst MnSO 4 -CuSO 4 , add catalyst MnSO in 100ml mixed acid 4 -CuSO 4 and oxidant K 2 Cr 2 o 7 , the catalyst MnSO 4 -CuSO 4 The addition amount is 0.40 g, the oxidizing agent K 2 Cr 2 o 7 The concentration of the solution is 0.25mol / L, and the digestion solution is prepared; according to the volume ratio of sewage and digestion solution 1:3, the digestion solution is added to the sewage for digestion. The digestion temperature is 150-170°C, and the digestion time is 10-20min. Use a photometer or water quality chemical oxygen demand (COD Cr ) online monitor through Cr 3+ The absorbance of 610nm light is used to measure the chemical oxygen demand of water quality.

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Abstract

This invention relates to one rapid resolving photometric analysis water medium chemical oxygen volume testing method, which comprises the following steps: making H2SO4-H3PO4 mixture with proportion as 3:1-5:1; making catalytic agent MnSO4-CuSO4 with weight proportion as1:1-1:3; adding catalytic agent into the mixture of 100ml with catalytic agent weight as 0.25-0.40g with oxidation K2Cr2O7 concentration as0.10-0.25mol/L to make resolving liquid; adding the liquid into the dirty water with proportion 1:2-1:3 with resolving temperature as 150-170DEG C and time as10-20min; Measuring the water medium oxygen volume by adopting photometric meter online monitor through Cr on 590-610nm light.

Description

technical field [0001] The invention belongs to a water quality analysis method, in particular to a method for rapidly digesting photometric analysis and measuring water quality chemical oxygen demand. Background technique [0002] Water Quality Chemical Oxygen Demand (COD Cr ) is one of the main monitoring indicators of the environmental water quality standards promulgated by our country, which reflects the degree of water pollution by reducing substances. Since organic matter is the main reducing pollutant, the chemical oxygen demand index of water quality can be used as a comprehensive indicator to measure the degree of water pollution by organic matter, and it is a basic comprehensive index for water quality monitoring. According to my country's development requirements for environmental monitoring, water quality monitoring equipment should gradually realize the functions of on-site, real-time, random and automatic monitoring. [0003] The current potassium dichromate ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/25G01N31/00
Inventor 金振兴李卫东黄红艳李铁军孙曙光肖振林曲蛟
Owner BOHAI UNIV
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