Method for rapidly measuring arsenic element in grain by X fluorescent spectrometry

Abstract

The invention discloses a method for rapidly measuring arsenic element in grain by an X fluorescent spectrometry. The method comprises the steps of step one, manufacturing a standard curve of a standard sample, namely sieving a series of arsenic grain powder with standard content gradient, putting the sieved powder into a sample cup and compacting; scanning a series of standard sample on a machine to obtain the X fluorescence intensity of the standard sample with known content, and calibrating the standard curve; and step two, treating a sample to be measured, namely removing peels of a certain amount of taken grain, grinding and sieving; packaging the taken powder into the sample cup and compacting to form the sample to be measured, wherein the amount of the powder is equal to that of the powder in the step one; testing by a machine, and calculating the content. Due to adoption of the method, the current detection accuracy and the repeatability are optimized, so that the high accuracy of the test results, good regularity and good evenness are guaranteed; meanwhile, the treatment method is simple, and only a hammer type cyclone grinder is used for grinding and sieving the sample, so that the time is short, and the pretreatment of the sample only needs 2 seconds; the instrument can test simply and can be operated by a key, no instrument exists, environmental protection is realized, and waste consumable is not produced.

Description

technical field [0001] The invention relates to food safety, in particular to a method for determining heavy metals in grains. Background technique [0002] With the rapid development of China's economy, due to various reasons, the country's economic orientation has paid more attention to the digital economy, which has caused a lot of problems, and the food safety problem has become increasingly serious. Although the country has made many achievements in rapid economic growth, due to the previous extensive economic policies, the domestic natural environment has deteriorated sharply, and air pollution, water pollution, and soil pollution have also reached a very serious level. ", and the soil is an important source of food. With the increasing pollution of the soil, the grains grown from the soil will inevitably contain various polluting elements, among which heavy metal pollution has become a particularly prominent problem. . [0003] Heavy metals are widely distributed in...

AI Technical Summary

Problems solved by technology

[0005] The national standard for the detection of arsenic in rice is basically a chemical detection method, and the sample needs to be treated with acid. The treatment methods generally use ashing method, microwave digestion method, wet digestion method, etc. The operation is cumbersome, and strong acid is used at the same time, and there is a lot of acid gas. Generation, the entire sample processing time is long, at least 2 hours, time-consuming and laborious

The current technology also uses X-ray fluorescence spectroscopy (XRF) analysis, which has the advantage of non-destructive testing and can directly analyze the finished product, but the current detection accuracy and repeatability are not as good as spectroscopic methods, so it is necessary to improve the detection method of X-ray fluorescence spectroscopy to obtain more accurate results. Accurate Test Results

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