High dilution factor water sample analysis method and device thereof

Abstract

The invention relates to a high dilution factor water sample analysis method, which includes the following steps: A, confirming input parameters: the volumes of n-1 grade dilution sample and a diluent adopted during nth grade dillution can be obtained as per the dilution factor gn of the n grade, wherein the dilution grade is m, and n belongs to the interval from 1 to m (including 1 and m), the product of dilution factors of all grades is the total dilution factor, and the dilution sample of 0 grade is a to-be-diluted sample; B, performing m grade dilution for the sample until the m grade dilution sample is formed: an injection pump is controlled through a control unit to respectively inject an n-1 grade dilution sample and the diluent both with the volumes corresponding to those of the n grade dilution in an nth mixing chamber through multi-channel direction selecting valves, so as to form the n grade dilution sample; and C, detecting the concentration of an m grade dilution sample, so as to finish the measurement. The invention further provides a high dilution factor water sample analysis device. The high dilution factor water sample analysis method and the high dilution factor water sample analysis device have the advantages of convenience for operation and accuracy in dilution.

Description

technical field [0001] The invention relates to a water sample dilution analysis method and device, in particular to a water sample analysis method and device suitable for high dilution factors. Background technique [0002] When online water quality analyzers are used for online monitoring of polluted water bodies, the analytical instruments are usually designed with corresponding analysis ranges. If the degree of pollution of the water body is too high, the concentration of the corresponding monitoring factor indicators in the water body will be too high, exceeding the range of the analyzer; or if the concentration of the interfering matrix is ​​too high and the chromaticity interference is serious during the spectrophotometric detection, the analysis results will be affected. When the above situation occurs, it is often necessary to accurately dilute the water body before analyzing and testing. [0003] The existing automatic water sample dilution system that can be appl...

AI Technical Summary

Problems solved by technology

[0006] With the increase of the use time of the peristaltic pump, the peristaltic pump tube will age, and the flow rate will also drift to varying degrees, which will lead to the inability to accurately control the dilution factor, making the detection signal error of the analytical instrument larger

[0007] 2) The residual water sample pollutes the next measurement sample, resulting in inaccurate detection

[0008] The peristaltic pump tube will contact the water sample and be polluted by the water sample, and sometimes the pollution will damage the pump tube, so that the sample flow rate cannot be accurately controlled; the pump tube that has been polluted by the water sample will pollute the subsequent measurement sample, making the analysis result inaccurate

[0009] 3) The flow rate range of the peristaltic pump is limited, which cannot meet the needs of dilution and high dilution factor water sample analysis

[0011] 1) Residual water samples pollute subsequent measurement samples, resulting in inaccurate detection

[0012] Some water samples will remain in the water sample quantitative tube, and the remaining water samples will pollute the water samples for subsequent analysis, making the analysis results inaccurate;

[0013] 2), troublesome operation

[0014] When the dilution factor needs to be changed, the corresponding quantitative tube needs to be replaced manually, which is troublesome to operate;

[0015] 3), unable to meet the needs of high dilution factor water sample analysis

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