Digestor for chemical oxygen demand (COD) water quality automatic analyzer

Abstract

The invention relates to the technical field of water quality automatic analysis equipment, in particular to a digestor for a chemical oxygen demand (COD) water quality automatic analyzer. The digestor comprises a digestion pipe, a light source assembly, a receiver assembly, a temperature sensing assembly, a temperature control assembly and supports, wherein the digestion pipe is arranged in the supports through a fixing member, and the light source assembly and the receiver assembly are oppositely arranged on the supports at two sides of the digestion pipe. In the digestor disclosed by the invention, all parts are arranged on the supports, when temperature changes, the connections among all parts hardly change, a light path is stable, and thus, the accuracy of a test result can be increased; and in a further technical scheme, a seal gasket is arranged so as to enhance the sealability of the digestor under a high-temperature and high-pressure condition, so that the digestion temperature can reach 175 degrees, the reaction efficiency is high and the measuring time is short.

Description

technical field [0001] The invention relates to the technical field of automatic water quality analysis equipment, in particular to a digestion device for an automatic chemical oxygen demand (COD) water quality analyzer. Background technique [0002] Most of the automatic chemical oxygen demand (COD) water quality analyzers use the potassium dichromate method. The measurement principle is that in the acidic medium of sulfuric acid, potassium dichromate is used as the oxidant, silver sulfate is used as the catalyst, and mercury sulfate is used as a masking agent for chloride ions. , the mixed water sample is heated and reacted in the digestion device, the hexavalent chromium ions in potassium dichromate are reduced to trivalent chromium ions, the concentration of trivalent chromium ions is detected by spectrophotometry and Lambert Beer’s law, and converted into water Sample COD values. Chemical oxygen demand (COD) water quality automatic analyzer is divided into spectrophoto...

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Problems solved by technology

[0005] 1. Due to the fact that the digestion device of the prior art is often in a high and low temperature alternating state during use, slight deformation is likely to occur between the connections of the entire device components, resulting in an unstable optical path, and the light source is easily affected by temperature. When the temperature is different , the luminous intensity of the light source is inconsistent, these will directly affect the accuracy of the measurement results

[0006] 2. Due to structural defects, the digestion reaction temperature of the prior art digestion device is mostly at 165°, and the sealing performance is not good under high temperature and high pressure, the reaction efficiency is relatively low, and the measurement time is long

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