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Automatic sample digestion and preparation instrument

A sample and automatic technology, applied in the field of chemical experiment instruments, can solve the problems of acid mist escaping pollution, slow digestion speed, low energy utilization efficiency, etc., and achieve the effect of energy saving and high heating efficiency

Inactive Publication Date: 2016-06-22
INST OF BOTANY CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the electric heating plate is the most traditional and widely used digestion instrument, but its disadvantages are slow digestion speed, low energy utilization efficiency, loss of volatile components, acid mist escaping to pollute the atmosphere, poor working conditions for experimenters, etc.; microwave digestion Compared with high-pressure digestion, the sample is digested in a closed environment, which eliminates many defects of the above-mentioned use of electric heating plate digestion, but the disadvantage is that the number of digested samples is limited, and the instrument is expensive. If too many samples are weighed or the microwave power set If it is too high, there is a danger of tube explosion. For safety reasons, experimenters still choose to digest samples in an open environment.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0027] Example 1 Automatic sample digestion and preparation instrument

[0028] Such as figure 1 As shown, the automatic sample digestion and preparation instrument includes an electric heating furnace 11, a reaction tube 4, a water bath jacket 5, a bracket 8, an acid mist filter 7, a lifting device, a horizontal reciprocating motion transmission mechanism, a sample inlet 22, a peristaltic pump and Movement control device 21.

[0029] The sample inlet 22, the bracket 8, the water bath jacket 5, and the electric furnace 11 are sequentially arranged from top to bottom.

[0030] Such as figure 1 with 3 As shown, the water bath jacket 5 is a container with a water inlet 10 and a water outlet 6, and the container has a plurality of through holes 51 for containing the reaction tube 4. The material of the water bath jacket 5 is a plastic with a thermal conductivity exceeding 0.4w / mK. The water bath jacket 5 is connected with a horizontal reciprocating transmission mechanism through a ...

Embodiment 2

[0034] Example 2 Molybdenum blue colorimetric method for determination of total phosphorus content in soil

[0035] The soil samples are digested with concentrated sulfuric acid and perchloric acid under heating conditions. After the digestion is completed, they are diluted, sodium hydroxide solution is added to adjust the pH value, and then the volume is fixed for the subsequent color reaction, and the color is compared with a spectrophotometer.

[0036] The operation steps of using the automatic sample digestion and preparation instrument are as follows:

[0037] About 0.1 g of soil sample is added to each reaction tube 4. Before the digestion, the reaction tube bracket 8 is in an elevated state, and 3 ml of concentrated sulfuric acid and 0.3 ml of perchloric acid are automatically added to each reaction tube through the injection port 22. Subsequently, the reaction tube bracket 8 is lowered, the lower part of the reaction tube is put into the cavity of the electric furnace, and t...

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Abstract

Disclosed is an automatic sample digestion and preparation instrument which is composed of an electric heating furnace, reaction tubes, a water bath sleeve, a bracket, an acid mist removal filter screen, a lifting device and a horizontal reciprocating drive mechanism. The bracket, the water bath sleeve and the electric heating furnace are arranged sequentially from top to bottom, the bracket is connected with the lifting device, and tube orifices of the reaction tubes are supported on the bracket; the water bath sleeve sleeves the reaction tubes and is connected with the horizontal reciprocating drive mechanism through a connecting rod; and the tube orifices of the reaction tubes are covered with the acid mist removal filter screen. The electric heating furnace is provided with a furnace cavity for accommodating the reaction tubes. The instrument adopts an open digestion mode, operation steps are safe, energy resources can be saved, acid mist is prevented from escaping to cause pollution to the atmosphere, the sample preparation process is automatically controlled, and the quality of the working environment for experimental technicians is improved.

Description

Technical field [0001] The invention relates to a chemical experiment instrument, in particular to a sample digestion and preparation instrument. Background technique [0002] In industries such as food, environment, chemical industry, agriculture, etc., the analysis and testing of samples often requires pre-digestion treatment to digest organic matter in the sample into inorganic components for subsequent experimental determination. For example, the determination of total nutrients in soil, plants, and fertilizer samples, the determination of trace elements, etc., all require pre-treatment of the samples for digestion. [0003] There are many methods for sample digestion, such as melting method, ashing method, wet digestion, etc. At present, wet digestion is the most common method in the laboratory, that is, acid digestion. The acid digestion method can be operated with electric heating plates, microwave digestion apparatus, high pressure digestion apparatus, etc. Among them, th...

Claims

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Application Information

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IPC IPC(8): G01N1/40
CPCG01N1/4044
Inventor 陈雅涵谢宗强
Owner INST OF BOTANY CHINESE ACAD OF SCI
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