Sample room for analyzing liquid absorption spectrum

Abstract

The invention provides an absorption spectrum collection sample room for analyzing a liquid absorption spectrum. The sample room comprises a sample tube, a light beam transmitting end and a light beam receiving end, wherein a cavity of the sample tube is used for carrying a liquid sample; the light beam transmitting end is connected with a port of the sample tube, and a light beam is guided along the longitudinal direction of the sample tube; the light beam receiving end is connected with the other port of the sample tube to receive the light beam which passes through the liquid sample in the cavity of the sample tube; and the inner wall material of the sample tube and the cross sectional dimension of the cavity of the sample tube are selected to realize that the liquid sample can form a liquid column, which is separated from the two ports, in the horizontal sample tube due to solid-liquid interface tension between the liquid sample and the inner wall of the sample tube, so that the light path of the light beam in the sample tube is from the light beam transmitting end, an air column, the liquid column, an air column to the light beam receiving end in sequence when the absorption spectrum is collected. After the structure and the light path are adopted, the liquid sample, the light beam transmitting end and the light beam receiving end are separated from one another by the air columns, so that the condition that an optical interface is polluted can be avoided, the thickness of an absorption layer can be adjusted and controlled by the volume of added liquid according to actual requirements, and an absorption spectrum signal with higher signal to noise ratio can be obtained.

Description

technical field [0001] The invention relates to an optical device applied in the field of analytical chemistry, in particular to a sample chamber used in liquid absorption spectrum analysis to collect the absorption spectrum of a liquid sample, and to a method for using the sample chamber to collect the absorption spectrum. Background technique [0002] The use of spectral signals of substances, especially absorption spectral signals, can realize rapid qualitative and quantitative analysis of chemical composition and chemical structure of substances, and is an important means in the field of analytical chemistry. To collect the absorption spectrum of a sample, it is necessary to build a reasonable sample carrying structure to minimize the interference caused by external environmental factors and manual operations, so as to ensure that the collected signal can objectively reflect the characteristic chemical information of the sample, and can be used as a qualitative Basis for...

AI Technical Summary

Problems solved by technology

Devices for collecting liquid absorption spectrum signals such as cuvettes have the following defects: (1) The cleaning is cumbersome, especially when the liquid sample contains oil or other substances with strong adhesion; (2) The light-transmitting surface is easily worn during the cleaning process , causing measurement errors; (3) to collect the ultraviolet absorption spectrum signal of the sample, it needs to be made of relatively expensive quartz glass; (4) the cuvette, flow cell or porous plate structure has a large volume and is placed inside the equipment. It is difficult to realize the miniaturization of spectroscopic instruments; (5) It is difficult to realize accurate and sensitive temperature control of liquid samples due to the small heat transfer surface per unit volume of the measured sample; (6) It is difficult to seal, and the volatile components of liquid samples are easy to evaporate and leak

Although this structure removes the restriction on the optical properties of the liquid sample holding container and is conducive to the miniaturization of spectroscopic instruments, there are still some defects: (1) The liquid sample is in direct contact with the emitting end, receiving end or reflective surface, which is easy to contaminate The surface of the optical device; (2) the liquid absorption layer of the fiber optic probe has a narrow space, and it is difficult to clean if it is contaminated by strong adhesion components in the liquid sample; (3) the volume of the liquid sample must be large enough to ensure that the fiber optic probe is immersed, which is difficult to achieve Micro-measurement; (4) In order to facilitate the operation of inserting the probe into the liquid sample, an open liquid sample container is usually used, which may easily lead to the evaporation and leakage of volatile components; (5) It is difficult to achieve sensitive temperature control due to the large volume of the liquid sample

[0005] In summary, the existing liquid sample absorption spectrum collection devices have certain limitations, resulting in high purchase and use costs, cumbersome operation and maintenance, and poor versatility of absorption spectrum measurement equipment.

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