Automatic titration method and application

Abstract

The invention discloses an automatic titration method which includes the following steps of 1, sampling and sample pretreatment, 2, titrator presetting, 3, first-stage titration, 4, second-stage titration, 5, speed-regulation control quantity point post-titration and 6, data acquisition. The automatic titration method is a test method capable of accurately and scientifically judging the titration end point, the mode of setting speed-regulation control point and speed-regulation control quantity is adopted, and the refinement of the titration process is guaranteed; meanwhile, after the speed-regulation control quantity point is reached, a mode of dropwise adding and delayed judgment is adopted, so that the accuracy of the titration end point can be effectively guaranteed. A fully automatic mode is adopted for the automatic titration method, the influences, on the measurement result, of manual operation are avoided, and the measurement result is high in accuracy and good in repeatability; the automatic titration method can be used for rinse performance tests.

Description

technical field [0001] The invention relates to an automatic titration method and its application, belonging to the technical field of household appliances. Background technique [0002] Rinsing performance, that is, the ability of a washing machine to remove laundry powder and residual pollutants, is an important item for washing machine performance testing. The detection methods for rinsing performance in the current washing machine standards of various countries are different, and the detection principles can be roughly divided into two categories: one is to use a certain component of washing powder as an indicator to detect the changes before and after rinsing to determine the rinsing performance of the washing machine. For example, the alkalinity method used by my country and IEC (International Electrotechnical Commission) is to detect the change of alkaline substances in washing powder. The washing machine standard currently being revised in the United States is to de...

AI Technical Summary

Problems solved by technology

The second titration method is generally used in scientific research work, and is rarely used in actual production.

[0004] Most titrators use the first titration method, but the first method has the following problems: (1) The automatic titration process is very prone to drop over the end point, because the chemical reaction has hysteresis, and the performance is different due to different solutions , often when the titrator finds that it has reached or is close to the end point, it will be difficult to grasp its speed, so in actual use, most of these automatic titrators use manual titration function, the so-called "automatic titration" is just a decoration; (2) Even if "Automatic titration" is achievable, but also lacks a unified judgment standard, that is, how long to judge after reaching the end point

In addition, no matter how high the accuracy of the titrator is, it may still happen that the previous drop is before the end point and the next drop is after the end point. At this time, the problem of how to judge the titration end point will also appear.

[0005] For a long time, when performing washing machine rinsing performance tests, because different companies use different equipment (different sensor accuracy), personnel operating proficiency, operating habits, etc., resulting in poor repeatability of rinsing tests

In particular, there is often a large difference in the judgment of the titration end point during the test.

Due to the hysteresis of the chemical reaction, the difference in the judgment of the end point often leads to the reduction of the stability and accuracy of the test results

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