Laboratory COD automatic analysis robot

Abstract

The invention discloses a laboratory COD automatic analysis robot. The laboratory COD automatic analysis robot comprises a plurality of digestion pipes which are arranged on a digestion pipe disc and are used for storing a water sample to be detected, an automatic liquid feeding system, a digestion heating system, a cooling system, a titration finishing point judging system and a controller for controlling each system to finish experiment operation steps, wherein the input end of the controller is connected with instruction input equipment; the output end of the controller is connected with the automatic liquid feeding system, the digestion heating system, the cooling system and the titration finishing point judging system respectively; and the output end of the titration finishing point judging system is further connected with display equipment. The laboratory COD automatic analysis robot integrates automatic sample feeding, batch determination and automatic analysis functions; and a potassium dichromate titration method is adopted so that the COD of a water sample can be rapidly determined, and a plurality of samples can be tested simultaneously so that the laboratory COD automatic analysis robot is convenient and rapid and has high accuracy.

Description

technical field [0001] The invention relates to the field of analytical instruments, in particular to an automatic device for continuously measuring a plurality of water samples by means of titration. Background technique [0002] Chemical Oxygen Demand (abbreviated as COD) is one of the most important comprehensive indicators of organic pollution in water environment monitoring. (in mg / L), it is a comprehensive index to characterize reducing substances in water. The reducing substances in water include various organic substances, nitrite, sulfide, ferrous salt, etc., but the main ones are organic substances, so chemical oxygen demand (COD) is often used as an index to measure the content of organic substances in water. The larger the amount, the more serious the water body is polluted by organic matter. [0003] The detection principle of GB11914-89 "Determination of Chemical Oxygen Demand in Water Quality Dichromate Method" is: add a certain amount of potassium dichromat...

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Problems solved by technology

[0004] At present, the instruments and equipment used in the laboratory to analyze the COD content in water samples mainly include digesters and titrators. Manual sampling, feeding and feeding into the digester are required. After digestion and cooling, they are put into the titrator for testing. The whole test process It is time-consuming and labor-intensive, and can only be tested individually, and multiple samples of the same water sample cannot be tested under the same conditions, coupled with human operation factors, the accuracy of the test results is low

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