Reagent and method for rapid digestion colorimetric determination of chemical oxygen demand of sewage

A chemical oxygen demand and colorimetric determination technology, applied in the direction of color/spectral characteristic measurement, test sample preparation, etc., can solve the problems of not meeting fast requirements, long digestion time, high detection cost, etc., and achieve digestion time Short, easy to operate, and the effect of improving detection efficiency

Pending Publication Date: 2020-02-28
SUZHOU IND PARK QINGYUAN HUAYAN WATER
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the special chemical oxygen demand reagents and supporting digesters and spectrophotometers of Hach Company are expensive, resulting in high detection costs
In addition, the digestion time of the hash method is 2 hours, which is too long to meet the fast requirements

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Reagent and method for rapid digestion colorimetric determination of chemical oxygen demand of sewage
  • Reagent and method for rapid digestion colorimetric determination of chemical oxygen demand of sewage
  • Reagent and method for rapid digestion colorimetric determination of chemical oxygen demand of sewage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The present embodiment provides a kind of rapid digestion and colorimetric reagent for determining the chemical oxygen demand of sewage, including catalyst and composite oxidizing agent, wherein the catalyst consists of 500ml concentrated H 2 SO 4 and 2.5 grams of Ag 2 SO 4 Formulated; the complex oxidant consists of 2 grams of K 2 Cr 2 o 7 , 3 g NH 4 VO 3 , 3 grams (NH 4 ) 2 MoO 4 , 5 grams K 2 SO 4 , 3 g HgSO 4 and 135ml dilute H 2 SO 4 (Pure water 100ml plus 35ml concentrated sulfuric acid) prepared.

[0020] The present embodiment also provides a method for measuring the chemical oxygen demand of sewage by using the above-mentioned reagents, and analyzes the measurement results, as follows:

[0021] (1) Drug preparation

[0022] COD standard solution: Weigh 0.5951 g of potassium hydrogen phthalate (standard reagent) dried at 105°C for 2 hours, dissolve it in first-grade pure water, dilute to 1000 mL, and mix well. The theoretical COD value of this s...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention provides a reagent and method for rapid digestion colorimetric determination of chemical oxygen demand of sewage. The reagent comprises a catalyst and a composite oxidant. The catalyst comprises silver sulfate and sulfuric acid, and the composite oxidant comprises potassium dichromate, ammonium metavanadate, ammonium molybdate, potassium sulfate, mercury sulfate and dilute sulfuric acid. The method comprises the step of digesting a water sample by using the reagent. The method disclosed by the invention can be used for determining by using a common spectrophotometer in a laboratory, does not need a hash matched spectrophotometer, reduces the detection cost, is simple to operate and short in digestion time, can be used for simultaneously digesting dozens of water samples, andis suitable for batch detection of the water samples. Experimental results show that the detection limit of the method is 4.52 mg / L, the oxidation rate of organic matters is greater than or equal to 99.0%, and the relative error is less than or equal to 5% when the chemical oxygen demand determined by adopting the method is compared with the result determined by adopting a hash method.

Description

technical field [0001] The invention relates to the field of water quality analysis, in particular to a reagent and method for rapid digestion and colorimetric determination of chemical oxygen demand in sewage. Background technique [0002] As people pay more and more attention to environmental protection, local governments continue to improve the sewage discharge standards of sewage treatment enterprises. In order to make the received sewage meet the standard discharge under the existing process conditions, the sewage treatment enterprises need to take samples of various types of sewage received frequently and detect the content of pollution factors. The chemical oxygen demand of sewage is one of the main monitoring indicators of environmental water quality standards. It reflects the degree of pollution of water samples by reducing substances. The reducing substances in water consist of organic matter, sulfide, nitrite, ferrous salt and other substances. The organic matter...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G01N21/31G01N1/44
CPCG01N21/31G01N1/44
Inventor 章文华关永年刘玉红徐锡梅余沛芝何敏赵赛君景二丹
Owner SUZHOU IND PARK QINGYUAN HUAYAN WATER
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap