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Method for determining chemical oxygen demand of liquid sample and analyzer

A technology of chemical oxygen demand and analyzer, applied in chemical instruments and methods, material analysis by observing the impact on chemical indicators, analysis by making materials undergo chemical reactions, etc., can solve the problem of unfavorable environment, expensive, damage Operator health and other issues

Inactive Publication Date: 2015-02-11
ENDRESS HAUSER CONDUCTA GESELLSCHAFT FUER MESS UND REGELTECHNIK MBH CO KG
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  • Abstract
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Problems solved by technology

However, this is expensive and is additionally environmentally unfavorable, especially in processes using mercury(II) salts, and can be detrimental to the health of operators

Method used

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  • Method for determining chemical oxygen demand of liquid sample and analyzer
  • Method for determining chemical oxygen demand of liquid sample and analyzer

Examples

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Embodiment Construction

[0053] figure 1 A first example of an automatic analyzer 1 for determining chemical oxygen demand is shown schematically. The analyzer 1 has a reaction vessel 3 and a transport and dosing device 5 for transporting and dosing liquid samples and various other substances into the reaction vessel 3 . Furthermore, the analyzer has a plurality of storage containers 7 , 9 , 11 in which the liquid to be investigated and reagents added to the liquid are contained. A sample extraction device 13 cooperating with the analyzer 1 is used to extract the liquid 15 to be investigated from a sampling point 17, such as a tank, pool or pipeline. The analyzer 1 comprises an evaluation and control device 19 for automatically performing the determination of the chemical oxygen demand of a sample of the liquid 15 taken from the sampling point 17 .

[0054] The evaluation and control device 19 is a data processing device comprising, for example, a computing device with one or more processors and one...

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Abstract

The invention relates to a method for determining the chemical oxygen demand of a liquid sample and an analyzer. The invention describes a method for determining the chemical oxygen demand of a liquid sample by means of an automatic analyzer. The method comprises: -adding a predetermined amount of a reagent to the liquid sample for masking chloride or for the separation of chloride from the liquid sample; -then determining the chemical oxygen demand of the liquid sample; and characterized in that an evaluation and control device of the analyzer determines the predetermined amount of the reagent based on at least one of a chloride content of the liquid sample representing the measured value. The invention also describes an analyzer for carrying out the method.

Description

technical field [0001] The present invention relates to a method and an analyzer for the automated determination of the chemical oxygen demand of a liquid sample. Background technique [0002] Chemical oxygen demand, referred to as CSB (English: chemicaloxygendemand, COD) is expressed as oxygen equivalent Quantity of a compound (usually a strong oxidizing agent) that is consumed by oxidizable components contained in a defined volume of a liquid sample under the reaction conditions of a specified method. Here, potassium dichromate (K 2 Cr 2 o 7 ) is often used as an oxidizing agent, potassium permanganate (KMnO 4 ) can also be considered. The CSB value is an important parameter for classifying the degree of contamination of living water, especially with organic pollutants, and in the treatment and purification of sewage. [0003] In most methods for determining the chemical oxygen demand, a liquid sample is treated with the known overspending of oxidant, and the subseq...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/17G01N27/26
CPCC02F3/006C02F2209/001C02F2209/005C02F2209/08C02F2209/11C02F2209/29G01N21/77G01N27/333G01N33/1806
Inventor 克劳迪娅·施洛特
Owner ENDRESS HAUSER CONDUCTA GESELLSCHAFT FUER MESS UND REGELTECHNIK MBH CO KG
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