Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Measuring method for total organic carbon, measuring method for total nitrogen and measuring apparatus for the methods

A measurement method and technology of measurement device, which are applied in measurement device, immunoassay, chemical method analysis, etc., can solve the problems of slow gas transmission speed, limited materials, and limited gas selectivity.

Inactive Publication Date: 2008-05-21
SHIMADZU SEISAKUSHO CO LTD
View PDF3 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

), but the material of the permeable part with gas selectivity is limited, or there are problems such as slow gas permeation rate and limit of gas selectivity

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
  • Measuring method for total organic carbon, measuring method for total nitrogen and measuring apparatus for the methods

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0034] First, a general method for measuring the total organic carbon content will be explained.

[0035] This method includes the steps of determining the total organic carbon content as follows, namely: (1) the step of oxidatively decomposing the organic matter contained in the sample water to carbon dioxide, and (2) the carbon dioxide passing through the gas permeation part into the measurement water. Step: (3) Measuring the conductivity of the measured water.

[0036] As the sample water, an aqueous solution of urea (0.5 mg / L in TOC conversion) based on an aqueous solution of potassium hydrogen phthalate (0.5 mg / L in TOC conversion) as a standard substance for total organic carbon measurement was used, and 1 / 200 of it was added quantitatively The total organic carbon content in the sample water in the case of 6N-phosphoric acid (around pH 1) and the case of adding 1 / 200 of 1N-sodium dihydrogen phosphate solution (around pH 5).

[0037] In the case of adding 6N-phosphoric acid (a...

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 present invention provides a method for measuring total organic carbon content by removing the influence of nitrogen components. This method obtains the total organic carbon content through the following process, namely: (1) adjusting the hydrogen ion concentration of the sample water to the range of pH 4 to 6, (2) oxidizing and decomposing the organic matter contained in the sample water to carbon dioxide, Nitrogen compounds are oxidatively decomposed into nitrous acid, (3) carbon dioxide is allowed to permeate into the measurement water through the gas permeable part (5a), and (4) the electrical conductivity of the measurement water is measured.

Description

Technical field [0001] The present invention relates to a method for measuring the amount of organic carbon or nitrogen in sample water and a measuring device used for these measuring methods, and in particular to an organic substance contained in water containing few impurities called pure water or ultrapure water by oxidative decomposition After the substances or nitrogen components are separated by a gas permeable part, a method for measuring the total organic carbon content or total nitrogen content using electrical conductivity and a measuring device used for these measurement methods. Background technique [0002] In Japan, the method for measuring organic pollutants, nitrogen compounds, and phosphorus compounds such as BOD (Biochemical Oxygen Demand) or COD (Chemical Oxygen Demand) components in water has been standardized by the Japanese Industrial Standards (JIS), "UV Absorbance "Method" (refer to Non-Patent Document 1.) is most commonly used due to its simple structure....

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
Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/00G01N27/04G01N33/18
CPCG01N31/005G01N27/06G01N33/1846G01N27/04Y10T436/235Y10T436/176152
Inventor 藤山阳一森田洋造片所功
Owner SHIMADZU SEISAKUSHO CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com