A multi-channel sampling needle and its application in codmn analyzer

Abstract

The invention provides a multichannel sample injection needle. The multichannel sample injection needle is characterized in that the multichannel sample injection needle consists of a multichannel sample injection needle body and one or more than one channel, wherein the multichannel sample injection needle body consists of at least one sample injection / extraction part and at least one reagent sample injection part; a channel which can longitudinally penetrate through the whole sample injection / extraction part is arranged in each sample injection / extraction part; a channel which can longitudinally penetrate through the whole reagent injection part is arranged in each reagent sample injection part; all the channels are independent of one another. The invention provides a multichannel needle device, which can finish injection and extraction of multiple reagents at the same time; the multichannel needle device is combined with transfer equipment, so that the functions of continuously adding samples, adding the reagents and extracting the samples in the analyzer are realized.

Description

technical field [0001] The invention provides a chemical analysis instrument, in particular relates to a multi-channel sampling needle and its application in CODMn analyzers. Background technique [0002] In the use of some analytical instruments, it is necessary to inject multiple reagents into the reaction bottle simultaneously or sequentially, and extract the solution for analysis after the reaction is completed. Such as: potassium permanganate index analyzer, etc. In the existing methods, it is often used to manually complete the reaction outside the instrument and then inject it into a corresponding analytical instrument for detection and analysis of indexes such as target absorbance. [0003] In order to realize the automatic sample injection procedure, at the beginning of the research, a single-channel needle was used to realize the injection of reagents and the removal of samples. However, the research found that there are many problems in using this device as follo...

AI Technical Summary

Problems solved by technology

[0004] First, each reagent needs to enter a single channel in time, which consumes a long time and can only detect a single sample, so that the sample injection equipment must wait for processing from the end of the sample reaction to the completion of the analysis, which cannot be effective utilization time, and the efficiency still cannot be improved

[0005] Second, in the equipment limited by this structure, since different reagent solutions are injected sequentially in the same pipeline, due to the miscibility of various solvents, not only is it difficult to clean, but also the problem of cross-contamination between reagents is extremely easy to occur, which directly affects The accuracy of the experimental results

[0006] Third, in the equipment limited by this structure, since the process of entering and exiting the sample and entering the reagent is realized in the same pipeline, in the process of outputting the test sample, it is inevitable that the sample to be tested is left in the pipeline. Contamination of reagents and other substances, leading to inaccurate results

[0007] Fourth, due to the problems involving the entry and exit of multiple reagents and samples, the flow path switching control system is extremely complicated, and when a certain pipeline needs maintenance or deep cleaning, it is very easy to cause problems due to complex pipeline settings. Pipeline maintenance difficulties

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