Automatic liquid volume quantifying and concentrating method with adjustable precision

Abstract

The invention relates to an automatic liquid volume quantifying and concentrating method with adjustable precision, belonging to the field of testing. The functions of rapid concentrating with multiple choices and automatic volume quantifying with high precision are realized through the following assemblies: a basic assembly, a temperature control assembly, an air blow assembly, a negative pressure extraction and condensing assembly, a rotational shaking evaporation assembly and an automatic liquid level detection assembly which are arranged on a basic component. With the automatic liquid volume quantifying and concentrating method, the concentrating ways including heating, rotational evaporating, negative pressure extracting, air blowing and the like can be simultaneously provided for a user for selecting, so that the selectivity is wide, the flexibility is high, meanwhile, the experiment process is accelerated, and time and cost are saved; in addition, through the position match of two groups of sensors with low precision, the purpose of improving precision detection is improved, and the manufacturing cost is reduced. The method can be widely applied to the field of high-precision liquid level detection during the quantifying concentration process of chemical sample pretreatment.

Description

technical field [0001] The invention belongs to the field of chemical analysis or testing, in particular to a liquid volume quantification and concentration method for chemical pretreatment. Background technique [0002] Analytical chemistry is a science that studies the analytical methods and theories of chemical information such as the composition, content, structure and form of substances. When analyzing a sample, it is generally necessary to try to separate the different chemical components. [0003] Chemical pretreatment is the pretreatment process for separating different components of the analysis sample, or removing interfering components, or changing its state for convenient measurement, etc., mainly including sample extraction, purification, enrichment, derivatization, etc.; [0004] Quantitative concentration is a sample pretreatment technology developed in recent years. [0005] In terms of concentration, the volatilization of the solvent in the sample solution...

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Problems solved by technology

[0006] In terms of quantitative volume, there are mainly two methods in the prior art. One is the manual method, that is, through human observation, the concave liquid surface is tangent to the corresponding scale. Capacity to a certain volume), the work intensity is high, and it is used less and less now; the other is the use of automatic identification technology, that is, a pair of liquid level detection sensors composed of a transmitter and a receiver are driven by a mechanical arm to detect Liquid volume, which uses the refraction principle of light to judge the position of the liquid surface. When the light emitted by the light source at the transmitting end does not exceed the critical position of the horizontal tangent of the concave liquid surface, the light passes through vertically and directly shines on the receiving end (the received light intensity is the largest ); when the light emitted by the light source at the transmitting end exceeds the critical position of the horizontal tangent of the concave liquid surface, the light will be refracted, but the receiving end will not receive the light, or the received light intensity will drop significantly, so it can be judged that this position is the concave surface. liquid level

[0007] This method can determine the position of the meniscus, but since the diameter of the light beam emitted by this liquid level detection sensor is relatively large (for example, the diameter of the light output is generally 3mm, mainly to reduce the difficulty of installation for users), even if a small hole is used Leakage masks (such as small holes with a diameter of 0.5mm) to reduce the beam diameter are also difficult to meet the needs of small volume and high precision quantitative volume determination

[0008] Moreover, most of the relevant equipment currently on the market is only satisfied with the single function of concentration or volume quantification, and there are few products integrating both functions.

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