Method and device for removing chloride ions from a to-be-measured water sample
A chlorine ion and water sample technology, applied in the direction of measuring devices, test sample preparation, sampling, etc., can solve the problems of dechlorination performance, temperature drop, and inability to remove chlorine ions, so as to ensure the dechlorination performance and improve The effect of accuracy
Inactive Publication Date: 2017-05-31
SHIMADZU SEISAKUSHO CO LTD
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Problems solved by technology
[0005] The method for removing the chlorine ions in the COD water sample to be tested needs to blow air continuously in the container, and when the chlorine ion in the COD water sample to be tested is too high (for example, greater than 5000mg / L), the chlorine ions in the water sample are removed The time required for continuous blowing will be relatively long (for example, more than 10 minutes)
When external cold air is continuously blown into the container for a long time, the temperature of the liquid in the container will continue to decrease, which may cause the temperature of the liquid in the container to not always be kept at the temperature required for the chemical reaction during dechlorination ( That is, a certain high temperature above), which will lead to a decline in the performance of chlorine removal, and cannot completely remove the chlorine ions in the COD water sample to be tested, thereby affecting the COD measurement results
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[0029] In order to further illustrate the content of the present invention, the present invention will be described in more depth and in detail through the description of specific implementation modes below in conjunction with the accompanying drawings.
[0030] The device for removing chlorine ions in the COD water sample to be tested provided by the present invention includes an open container, a heating device, and an air blowing device. The open container is used to place a certain volume ratio of the mixed solution of COD water sample to be tested and concentrated sulfuric acid in it. The heating device is used for heating the open container to heat the mixed liquid to the target temperature, and keep the temperature of the mixed liquid at the target temperature. At the target temperature, the chlorine ions in the COD water sample to be tested can chemically react with the concentrated sulfuric acid to generate hydrogen chloride in the open container. The air blowing dev...
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The invention provides a method for removing chloride ions from a to-be-measured water sample. The method comprises: a mixing liquid of the to-be-measured water sample and concentrated sulfuric acid at a certain volume ratio is placed in an opened container; a heating device is used for heating the opened container to heat the mixing liquid to a target temperature and keeping the temperature of the mixing liquid at the target temperature, and chloride ions in the to-be-measured water sample and the concentrated sulfuric acid can chemically react to generate hydrogen chloride in the opened container; a blowing device is used for blowing inward the opened container discontinuously, and when the blowing device blows inward the opened container, hydrogen chloride in the gaseous state can be brought out from the opened container, wherein the heating device can keep the temperature of the mixing liquid at the target temperature in the process that the blowing device blows inward the opened container discontinuously. The invention further provides a device for removing the chloride ions from the to-be-measured water sample.
Description
technical field [0001] The invention relates to a method and a device for removing chloride ions in a COD water sample to be tested. Background technique [0002] COD (Chemical Oxygen Demand) is a very important parameter in the research of river pollution and industrial wastewater properties, as well as the operation and management of wastewater treatment plants. It refers to the amount of oxidant consumed when a certain oxidant is used to treat water samples under certain conditions. It is used to reflect the degree of water pollution by reducing substances and can be used as a comprehensive indicator of the relative content of organic matter. [0003] In the prior art, the potassium dichromate method is a commonly used method for determining the COD of the water sample to be tested for COD. In this method, potassium dichromate is used as the oxidant, silver sulfate is used as the catalyst, and the organic matter in the water sample is oxidized in a sulfuric acid medium a...
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IPC IPC(8): G01N1/40
CPCG01N1/40G01N1/4022
Inventor 蔡路板桥亨久
Owner SHIMADZU SEISAKUSHO CO LTD