Method for rapid determination of content of selenium in soil sample

A soil sample and rapid determination technology, which is applied in the field of physical and chemical testing, can solve the problems of complex standard curve preparation, many test steps, and large reagent consumption, and achieve the effects of shortening the detection cycle, reducing reagent consumption, and easy operation

Inactive Publication Date: 2012-06-27
SUZHOU SETEK
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Benefits of technology

Inventions have several benefits that make them better than previous methods for measuring selenium levels accurately. They use hydrogen gas generators or atoms emitting light to measure their concentration without requiring complicated procedures like coolings before analysis. These techniques are highly accurate but they take too long because thermal processes must be done under specific conditions such as low temperatures during measurement. However, these new technologies allow us to reduce reaction times while still maintain precise measurements compared to existing methods.

Problems solved by technology

This patent describes various technical problem addressed by this patented technology that includes finding ways to accurately determine both selenium levels and mineral concentrations within soil without requiring complex operations and expensive equipment. Current techniques involve analyzers like ionization chloride gas time-consuming assay, X ray photoelectric emission spectrometer, nuclear magnetic resonance spectrum analyzer, and hydrogen sulfate generator-atomfluorin reaction. However these existing technologies suffer drawbacks including complexity, lengthy processing cycles, poor sensitivity, difficulty in identifying specific element types, and lack of ability to distinguish between different forms of selenium.

Method used

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  • Method for rapid determination of content of selenium in soil sample
  • Method for rapid determination of content of selenium in soil sample
  • Method for rapid determination of content of selenium in soil sample

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] (1) The atomic fluorescence spectrometer used in this laboratory is AFS-9230 from Beijing Jitian Instrument Co., Ltd.

[0061] (2) Digestion of the sample to be tested: Accurately weigh 0.2000 g of the soil sample to be tested, place it in a 50 ml conical flask, add 10 ml of mixed acid (nitric acid:perchloric acid=4:1), put a crooked-neck funnel on the bottle mouth, After mixing evenly, put it on the electric heating plate, digest at 180°C for 1 hour, drive out the nitric acid in the solution at 210°C until the solution emits white smoke, take it off the electric heating plate and cool it down, and obtain the digestion solution. Add 5ml of hydrochloric acid to the digestion solution, the concentration of hydrochloric acid is 6mol / L, mix well, and heat at 100°C for 15 minutes to obtain a reducing solution. Dilute the reducing solution with ultrapure water to a volumetric volume of 25ml, and take 5-10ml of the supernatant of the sample solution after volumetrication for d...

Embodiment 2

[0069] Compare this method with the People's Republic of China Agricultural Industry Standard "Determination of Total Selenium in Soil" NYT1104-2006 for the same sample.

[0070] The implementation details of the method are as in Example 1.

[0071] For detailed implementation rules of the National Standard Law, please refer to the Agricultural Industry Standard of the People's Republic of China "Determination of Total Selenium in Soil" NYT 1104-2006.

[0072] The test results of samples with different concentrations are shown in Table 2

[0073] Table 2 industry standard method and comparison of selenium content in the soil measured by this method

[0074]

[0075] It can be seen from Table 2 that there is no significant difference in the detection results of selenium content between the rapid detection method and the agricultural industry standard method.

Embodiment 3

[0077] (1) The instruments used in the experiment are the same as those in Example 1.

[0078] (2) Digestion of the sample to be tested: Accurately weigh 0.5000 g of the soil sample to be tested, place it in a 50 ml conical flask, add 15 ml of mixed acid (nitric acid:perchloric acid=4:1), put a crooked-neck funnel on the bottle mouth, After mixing evenly, put it on the electric heating plate and digest it at 150°C for 1 hour, drive out the nitric acid in the solution at 200°C until the solution emits white smoke, take it off the electric heating plate and cool it down to obtain the digestion solution. Add 4ml of hydrochloric acid to the digestion solution, the concentration of hydrochloric acid is 12mol / L, mix well, and heat at 100°C for 20 minutes to obtain a reducing solution. Dilute the reducing solution with ultrapure water to a volumetric volume of 25ml, and take 5-10ml of the supernatant of the sample solution after volumetrication for detection by an atomic fluorescence...

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Abstract

The invention discloses a method for rapid determination of the content of selenium in a soil sample. According to the invention, hydride generation-atomic fluorescence spectroscopy and a standard curve method are utilized; mixed acid is used, the mixed acid has powerful oxidation capability and does not need cold digestion or stay overnight, and hot digestion time can be shortened at a certain temperature, thereby substantially shortening a detection period. A standard curve can be directly prepared by using a national selenium standard solution, operation is simple, accuracy is high, and a good linear relation is obtained. Since atomic fluorescence spectroscopy has the characteristic of strong anti-interference capability, potassium ferricyanide has a weak effect on shielding interference of other elements and almost exerts no influence on detection results, so it is of no need to use the reagent of potassium ferricyanide, thereby reducing usage amount of reagents and enabling steps of the method to be simpler and operation to be easier.

Description

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Claims

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Application Information

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Owner SUZHOU SETEK
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