Comprehensive pretreatment instrument for chemical analysis of samples

Abstract

The invention discloses a comprehensive pretreatment instrument for chemical analysis of samples. The comprehensive pretreatment instrument comprises a liquid storage part, a dilution part, a sample collection part, a neutralization part, a concentration part and a control part. The comprehensive pretreatment instrument provided by the invention can select the on-line/off-line neutralization, dilution, concentration and matrix elimination functions for the samples by controlling the switching of circuits and valves; all the functions can be used independently on line or off line, can also be combined randomly according to requirements, can convert complex samples into aqueous solution, reduce or remove interfering substances, reduce the concentration of organism, adjust the pH value, concentrate and enrich components to be measured to meet the requirements on instrument analysis, reduce the influence of complex samples on analysis results, expand the selection of analysis method, increase a response value of instrument detection, and ensure the reproducibility and accuracy of instrument test. The comprehensive pretreatment instrument provided by the invention is suitable for scientific research, medicine and hygiene, environmental protection, industrial and agricultural production, recycling of industrial wastewater and waste materials and other industries, especially the alumina industry, and is high in practicability.

Description

technical field [0001] The invention relates to the technical field of analytical chemistry, in particular to a comprehensive pretreatment instrument for chemical analysis samples. Background technique [0002] The detection of complex samples requires sample pretreatment. The purpose of chemical analysis pretreatment is mainly to convert complex samples into a mixture of aqueous solution and polar organic solvent; reduce or remove interfering substances, reduce the concentration of the body; adjust pH; concentrate and enrich The components to be measured meet the requirements of instrumental analysis. [0003] The traditional sample pH adjustment is mainly realized by the principle of acid-base neutralization, that is, ion exchange makes the pH value reach neutral. When dealing with acid-base samples, the corresponding neutralizer is added to make the sample neutral through chemical reaction. However, adding acid-base reagents for neutralization can easily cause ion poll...

AI Technical Summary

Problems solved by technology

However, adding acid-base reagents for neutralization can easily cause ion pollution, and increase the concentration of salt ions, which is not conducive to detection and analysis, and affects test results; in addition, ion exchange will cause saturation of ion occupancy, so its application is largely restricted. Constraints, regeneration and loss of materials will take a lot of time, high application costs, etc.

[0004] The traditional dilution method is manual dilution, which is cumbersome to operate. If the pipette or volumetric flask used in the dilution process is contaminated or not cleaned, it will directly lead to a change in the concentration of the diluted sample; manual operation during the dilution process will also have certain problems. error

Directly affect test results, and it is difficult to guarantee the reproducibility of test data

[0005] The traditional concentration is all online concentration, not offline concentration; and the pure water is also concentrated when the sample is concentrated, resulting in high test results

It is also difficult to guarantee the reproducibility of test data

[0006] The traditional matrix elimination is all realized online, and the matrix cannot be eliminated offline, which limits the test range

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