Digestion method for measuring selenium in agricultural products and method for measuring selenium content in agricultural products
A technology for agricultural products and content, applied in the field of chemical detection and analysis, can solve the problems of complicated operation, loss of selenium in the determination component, low energy utilization efficiency, etc., and achieve the effects of simple and fast operation steps, convenient fluorescence detection, and good market prospects.
Inactive Publication Date: 2021-08-27
INST OF BAST FIBER CROPS CHINESE ACADEMY OF AGRI SCI
View PDF1 Cites 1 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Although electrothermal digestion is the most traditional and widely used digestion method, the digestion speed is slow, the energy utilization efficiency is low, the heating is uneven, the digestion temperature is difficult to control, and the determination of component selenium may be lost; while the number of samples processed by microwave digestion Limited, and the instrument is expensive, and the operation is cumbersome. If the amount of digested sample is too large or the power is set too high, there is a danger of tube explosion, and the safety factor is low.
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0048] A method for measuring total selenium in agricultural products, specifically comprising the following steps:
[0049] (1) After the agricultural product sample to be tested is dried, it is pulverized into powder, and the powder is dried to a constant weight to obtain a dry powder with a particle size of 0.125 mm to 0.150 mm; the drying temperature is 105°C±3°C.
[0050] (2) Weigh 0.25 grams of the above-mentioned dry powder, add it into a 50mL digestion tube, add 1mL deionized water to wet the sample with a dropper; 3 With a final concentration of 1.875mol / L, add 4.5mL of hydrochloric acid, 1.5mL of nitric acid and 6ml of deionized water into the digestive tube and shake well; finally, cover with a ground plug with a hole or a curved small funnel, and put it into an ultrasonic instrument for 10 minutes of sonication.
[0051] (3) After step (2) is completed, move the digestion tube into a constant temperature water bath (pot), and digest in a boiling water bath for 2 ho...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
| Property | Measurement | Unit |
|---|---|---|
| particle diameter | aaaaa | aaaaa |
| particle diameter | aaaaa | aaaaa |
Login to View More
Abstract
The invention belongs to the field of chemical detection and analysis, and relates to a digestion method for measuring selenium in agricultural products and a method for measuring the selenium content in the agricultural products. The digestion method provided by the invention comprises the following steps of: a) drying an agricultural product sample to be detected, crushing the agricultural product sample into powder, and continuously drying the agricultural product sample to constant weight to obtain dry powder; and b) mixing the dry powder with an acid solution, and then digesting the mixture in a boiling water bath to obtain a digestion solution. The acid solution is composed of HCl, HNO3 and water, the concentration of the HCl in the acid solution is 4 mol / L to 5 mol / L, and the concentration of the HNO3 in the acid solution is 1.7 mol / L to 2 mol / L. According to the method, the mixed solution of hydrochloric acid and nitric acid is used as a digestion reagent, the agricultural product dry powder sample is digested in the boiling water bath; expensive instruments and equipment do not need to be used; the operation steps are simple and rapid; the digestion efficiency is high; the temperature of the boiling water bath is easy to control; and the safety coefficient is high. The method is suitable for digestion of large-batch samples and has a good market prospect.
Description
technical field [0001] The invention belongs to the field of chemical detection and analysis, in particular to a digestion method for determining selenium in agricultural products and a method for determining selenium content in agricultural products. Background technique [0002] Determination of selenium in agricultural products, currently commonly used digestion method nitric acid-perchloric acid mixed acid electrothermal digestion, then add a certain concentration of hydrochloric acid to continue electrothermal digestion; Heat to dissolve. Although electrothermal digestion is the most traditional and widely used digestion method, the digestion speed is slow, the energy utilization efficiency is low, the heating is uneven, the digestion temperature is difficult to control, and the determination of component selenium may be lost; while the number of samples processed by microwave digestion Limited, and the instrument is expensive and cumbersome to operate. If the amount o...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/44G01N21/64
CPCG01N1/44G01N21/6428
Inventor 冷鹃肖爱平刘亮亮廖丽萍
Owner INST OF BAST FIBER CROPS CHINESE ACADEMY OF AGRI SCI