An atomic absorption spectrometer and detection method for simultaneous measurement of lead and cadmium elements in grain

Abstract

Disclosed are an atomic absorption spectrometer for detecting lead and cadmium elements in grain at the same time and a detection method. The spectrometer adopts a lead-cadmium composite hollow cathode lamp, a power supply and a control module, wherein the hollow cathode lamp is arranged in a lead element high-performance lamp working state, a cadmium element common lamp working state, and a copper element adjacent wavelength background correction working state, so that background correction measurement of lead and cadmium elements at the same time is achieved. At the meanwhile, a diatomized region atomizer, a power supply and a control module are adopted, wherein the diatomized region atomizer is arranged in a regional time-sharing atomization mode, and through setting of whether samplingis carried out in different regions and adjustment of sampling amounts in different regions, lead and cadmium single elements are calculated and selected in excellent sensitivity. The detection method comprises a pre-treatment method of extracting lead and cadmium elements from grain at the same time and a sampling and data treatment method for measurement at the same. The lead-cadmium compositehollow cathode lamp is different from a common multielement lamp, and is improved in light energy improved, widened in linearity range, and improved in sensitivity and detection limit. The method is suitable for detecting lead and cadmium elements in grain at a fast large flux at the same time.

Description

Technical field [0001] The invention relates to an atomic absorption spectrometer for simultaneous measurement of lead and cadmium elements in grains and a detection method, belonging to the technical field of atomic absorption spectroscopy. Background technique [0002] The World Health Organization identifies lead and cadmium as food pollutants and controls them. It is necessary to strengthen the detection of lead and cadmium in grain to prevent lead and cadmium poisoning. The existing food determination methods are mainly based on GB 5009.12-2010 "National Food Safety Standard for the Determination of Lead in Foods" and GB 5009.15-2014 "Food Safety National Standard for the Determination of Cadmium in Foods". The existing atomic absorption spectrometer can detect the content of lead and cadmium, but the limit value of lead and cadmium in food samples cannot match the linear range of the existing atomic absorption spectrometer, which makes it difficult to pre-process and measu...

AI Technical Summary

Problems solved by technology

The existing atomic absorption spectrometer can detect the content of lead and cadmium elements, but because the limit value of lead and cadmium in grain samples cannot match the linear range of the existing atomic absorption spectrometer, it is difficult to pre-treat and measure lead and cadmium in grain at the same time

[0003] The X-ray fluorescence spectrometer of Gangyan Nano can test the cadmium element in grain samples, but it is only limited to the measurement of cadmium element, and the measurement of lead element cannot be carried out

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