Rapid detection device for inorganic carbon and form thereof

Abstract

The invention discloses a rapid detection device for inorganic carbon and the form thereof. The rapid detection device comprises a solution degasifying device, a heating device, a mixing acidifying device, a carbon dioxide separating device and a carbon dioxide detecting device, wherein the solution degasifying device is used for removing dissolved gas from a sample solution and an acid solution on line; the heating device is used for heating the sample solution on line to transform bicarbonate radicals in the sample solution into carbon dioxide and carbonate; the mixing and acidifying device is used for transforming carbonate and bicarbonate radicals in the sample solution into carbon dioxide; the carbon dioxide separating device is used for separating carbon dioxide generated in each device out of the aqueous solution; the carbon dioxide detecting device is used for detecting separated carbon dioxide. The online degasifying machine and the online heating device are used at the same time, so that a blank value is lowered remarkably, the detection limit is lowered, and the content of dissolved carbon dioxide, bicarbonate radicals and carbonate in the sample can be detected at the same time. The device can be widely applied to the fields of foods, water quality, chemical industry, agriculture and the like.

Description

technical field [0001] The invention belongs to the technical field of detection instrument application, and relates to a carbonate in aqueous solution and a speciation analysis device thereof, in particular to an analysis device for measuring carbonate in aqueous solution. Background technique [0002] Carbonate determination has been widely used in various fields of society. Especially in the fields of food safety, environmental monitoring and protection, geological and mineral resource exploration and evaluation, agriculture and water resources, etc., it has a wide range of applications. At present, the methods for determining carbonate and its forms are mainly chemical titration, non-dispersive infrared spectroscopy and inductively coupled plasma atomic emission spectrometry. [0003] At present, the following problems exist in the determination of carbonates and their forms in aqueous solutions by the above method: (1) When using the gaseous carbon dioxide generation ...

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Problems solved by technology

[0003] At present, the following problems exist in the determination of carbonates and their forms in aqueous solutions by the above method: (1) When using the gaseous carbon dioxide generation method to inject samples, it is necessary to use inorganic acids to acidify the sample solution to make the carbonate and bicarbonate in the sample It is converted into carbon dioxide and then realizes gaseous carbon dioxide sampling, which requires that the distilled water used in the measurement must be boiled to remove carbon dioxide in advance, and then it can be used for sample dilution and preparation of dilute acid solution after cooling, otherwise a large amount of carbon dioxide dissolved in distilled water will make the measurement bring Large blank values, making the determination almost impossible

Therefore, distilled water must be boiled to remove carbon dioxide in advance. This process takes a lot of time, because not only the distilled water must be boiled, but also cooled before use, and all glass containers used must be washed with carbon dioxide-free distilled water for many times to remove carbon dioxide. carbon dioxide water remaining on the container

(2) When the form of carbonate is to be determined, that is, the content of carbonate and bicarbonate, the method error is relatively large, and multiple steps are often required for determination

For example, the titration method needs to be titrated in two steps, using two indicators, and the errors of the two end points are very large, and it is only suitable for detecting samples with relatively high content, and when the sample contains colored substances, it will interfere with the titration results; However, using the instrument method requires multi-step conversion to obtain the result, and at this time the free carbon dioxide dissolved in the solution must be removed by boiling in advance to ensure the accuracy of the measurement.

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