Quick determination method for cadmium element in grains with X-ray fluorescent spectrometry

Abstract

The invention discloses a quick determination method for cadmium element in grains with X-ray fluorescent spectrometry. The quick determination method comprises the following steps: step one, manufacturing the standard curve of a standard sample: sieving a series of cadmium grain powder with standard content gradient, and loading in a sample cup and ramming; scanning the series of standard samples on an instrument, obtaining the X-ray fluorescence intensity of the standard sample with known content, and calibrating the standard curve; step two, treating the sample to be detected: taking a quantitative amount of grains for removing peels, crashing and sieving; taking the powder with the same amount as that in the step one, loading in the sample cup and ramming to form a sample to be detected; testing on the instrument, calculating the content. The present detection precision and repeatability can be optimized, so that high accuracy, good regularity and good uniformity of test results are guaranteed; meanwhile, the treatment method is simple, the sample is smashed, sieved and treated by using a hammer type cyclone mill, the time is short, only 2 min is needed before the sample is treated, the instrument test is simple, and no consume material is wasted environment-friendly without an instrument through one-key operation.

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 Cd 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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