Laboratory COD automatic analysis robot

Abstract

The invention discloses a laboratory COD automatic analysis robot, which comprises a main machine body, a sample column, a heating position, a backflow device, a cooling position, a titration position, a mechanical arm and a liquid adding system, wherein the sample column, the heating position, the backflow device, the cooling position, the titration position, the mechanical arm and the liquid adding system are arranged on the main machine body; the bottom of the main machine body is provided with the sample column; the heating position used for heating a sample cup is arranged at the outer side of the sample column used for containing the sample cup. The laboratory COD automatic analysis robot has the beneficial effects that the device can complete the mass measurement of the COD of a plurality of samples in each time; after the detection result of the first sample is obtained, one datum is obtained every about 10 minutes; the detection efficiency is greatly improved; unattended operation is realized in the whole process; the testing flow process of each sample has consistency; the testing time of parallel sample is completely identical; the artificial interface factor is avoided;the testing result has relatively good reproducibility; the precision degree and the accuracy degree are higher.

Description

technical field [0001] The invention relates to an analysis instrument, in particular to a laboratory COD automatic analysis robot. Background technique [0002] The "Dichromate Method for the Determination of Chemical Oxygen Demand in Water Quality" (HJ 828-2017) is currently the main method for monitoring the chemical oxygen demand in water bodies in my country, and a large amount of monitoring data is generated across the country every year. Due to the high accuracy of this method and the constant systematic error, it is self-evident that it is a universally recognized standard method. However, when using this method to measure the chemical oxygen demand of water bodies, there are the following problems: (1) to complete the entire detection process, a variety of auxiliary experimental equipment is required, which takes up a lot of space; (2) the technical level of testers is required to be high, and The operation is labor-intensive; (3) the measurement takes a long time,...

AI Technical Summary

Problems solved by technology

However, when using this method to measure the chemical oxygen demand of water bodies, there are the following problems: (1) to complete the entire detection process, a variety of auxiliary experimental equipment is required, which takes up a lot of space; (2) the technical level of testers is required to be high, and The operation is labor-intensive; (3) The measurement takes a long time, and even experienced operators are difficult to process many samples at a time

(4) It is very easy to produce artificial measurement errors, and it is difficult to realize the batch detection of samples under the same conditions in the true sense

This device has the following disadvantages: (a) The electrode is used to judge the end point of titration during detection and analysis, and the titration of the next sample is realized by the movement of the titration device, which makes it easier to cause sample cross-infection in the continuous titration process and affect the determination The accuracy of the results; (b) when adding silver sulfate-sulfuric acid solution, it is not added slowly from the upper end of the condenser tube according to the HJ 828-2017 standard, but before the condenser tube is docked with the sample cup. This operation may cause Low-boiling-point organic matter escapes, which makes the measurement results smaller; (c) when the device performs batch detection of multiple parallel samples, the measurement time is different, and the measurement of batch samples under the same conditions in the true sense is not realized.

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