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Rapid Determination Method of Lead in Food

A rapid detection and food technology, applied in the direction of material excitation analysis, fluorescence/phosphorescence, etc., can solve the problems of lead-free rapid detection method standards, etc., and achieve the effect of making up for the long cycle of detection results, fast detection speed, and accurate and reliable detection data

Active Publication Date: 2018-02-09
YELLOW SEA FISHERIES RES INST CHINESE ACAD OF FISHERIES SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no standard for the rapid detection method for the determination of lead in food in the international ISO and CAC standards

Method used

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  • Rapid Determination Method of Lead in Food
  • Rapid Determination Method of Lead in Food
  • Rapid Determination Method of Lead in Food

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1: the mensuration of lead (Pb) in wheat flour:

[0033] A rapid determination method for lead in food, comprising: 1) selected instruments and equipment, 2) preparation of a standard curve, 3) testing steps, 4) instrument conditions used in the experiment, 5) calculation and presentation of results;

[0034] 1) Apparatus and equipment: direct sampling lead measurement device: DAA-5300 (Direct Arsenic Analyzer) combined with atomic fluorescence spectrometer (AFS) system:

[0035] (1) Part of the direct sampling lead measuring device (model DAA-5300): equipped with a quartz sample boat, two tube furnaces, two electrothermal quartz tubes, and four gas circuit control systems;

[0036] (2) AFS (model 8230) part: equipped with photomultiplier tube (PMT) negative high voltage, lead hollow cathode lamp, detector, gas circuit control system;

[0037] (3) Mixed gas of hydrogen and argon (15%+85%).

[0038] 2) Preparation of standard curve: Mix lead single-element s...

Embodiment 2

[0060] Embodiment 2: to the mensuration of Pb in tealeaves:

[0061] Mix tea standard substance (GBW10016) and alumina 1:10 evenly, weigh about 15.0mg and place it in a quartz sampling boat, and set it in a lead detector combined with an atomic fluorescence (AFS) instrument to measure the lead value; other conditions are The same as that of wheat, the determination result of the recovery rate of tea standard substance (see Table 3).

[0062] Table 3. Determination results of Pb recovery rate in tea standard substance

[0063]

[0064] It can be seen from Table 3 that the recovery rate of Pb in the tea standard substance we measured is 97.33-108.0%, and the recovery effect is ideal, which meets the requirements of the detection standard.

Embodiment 3

[0065] Embodiment 3: to the mensuration of Pb in the mussel:

[0066] Mix the mussel standard substance (GBW08571) and alumina 1:10 evenly, weigh about 15.0mg and place it in a quartz sampling boat, and set it in a lead detector combined with an atomic fluorescence (AFS) instrument to determine the lead value; other conditions All the same as that of wheat, the measurement results of mussel standard substance recovery (see Table 4).

[0067] Table 4. Determination results of Pb recovery rate in mussel reference material

[0068]

[0069] It can be seen from Table 4 that the recovery rate of Pb in the mussel standard substance we measured is 95.92-107.1%, and the recovery effect is ideal.

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Abstract

A rapid determination method for lead in food, belonging to the technical field of food detection, comprising: 1) selected instruments and equipment, 2) preparation of a standard curve, 3) testing steps, 4) instrument conditions used in the experiment, 5) results Calculation and expression; the selection of the experimental conditions of the present invention is reasonable, the detection data is accurate and reliable, the lead in the food can be directly measured by solid sample injection without digestion, and the pollution caused by digestion with strong acid is also avoided; The content detection speed is fast, and the timeliness of quality supervision is strong. At the same time, it made up for the defects of the existing national standard method, which caused the distortion of detection data and the long cycle of detection results due to incomplete digestion. At the same time, the detection time was shortened from more than 40 hours in the existing standard to 0.1 hour, which met the requirements for the lead content in food. Determining the need for effective implementation monitoring.

Description

technical field [0001] The invention belongs to the technical field of food detection, and in particular relates to a rapid determination method for lead in food. Background technique [0002] The harm of lead (Pb) to human health has aroused widespread concern of governments and consumers in various countries. Governments of various countries have adopted strict methods when formulating lead limit standards in food to protect consumers' health; Combined with the limit standards formulated by various countries, the limit standards for lead in various foods have been formulated successively. In order to be in line with the international standards, my country has also newly revised and promulgated the national standard of the People's Republic of China GB2762-2012 food safety national standard for lead in pollutants in food. [0003] The current corresponding detection method for lead content in food is: "Determination of Lead in Food" stipulated in the national standard GB / T50...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/64
Inventor 尚德荣翟毓秀赵艳芳宁劲松李风铃
Owner YELLOW SEA FISHERIES RES INST CHINESE ACAD OF FISHERIES SCI
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