Method for rapidly determining 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, compensating for the distortion of detection data, and avoiding pollution

Active Publication Date: 2015-09-16
YELLOW SEA FISHERIES RES INST CHINESE ACAD OF FISHERIES SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Method for rapidly determining lead in food
  • Method for rapidly determining lead in food
  • Method for rapidly determining lead in food

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1: Determination of lead (Pb) in wheat flour:

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

[0034] 1) Instruments and equipment: Direct sample introduction and lead measurement device: DAA-5300 (Direct Arsenic Analyzer) and atomic fluorescence spectrometer (AFS) combined system:

[0035] (1) Direct sample introduction and lead measurement device (model DAA-5300): equipped with a quartz sample boat, two tube furnaces, two electrothermal quartz tubes, and 4 gas 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: Use lead single element solution stand...

Embodiment 2

[0060] Example 2: Determination of Pb in tea:

[0061] Mix the tea standard substance (GBW10016) and alumina 1:10 evenly, weigh about 15.0mg into the quartz sample boat, set the lead meter and the atomic fluorescence (AFS) combined instrument to determine the lead value; other conditions are all Same with wheat, the determination result of the recovery rate of tea standard material (see Table 3).

[0062] Table 3. Measurement results of Pb recovery rate in tea reference materials

[0063]

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

Embodiment 3

[0065] Example 3: Determination of Pb in mussels:

[0066] Mix the mussel standard substance (GBW08571) with alumina 1:10 evenly, weigh about 15.0mg into the quartz sample boat, set the lead meter and atomic fluorescence (AFS) combined meter to determine the lead value; other conditions Both are the same as those of wheat, and the measurement results of the recovery rate of the mussel reference material (see Table 4).

[0067] Table 4. Measurement results of Pb recovery rate in mussel reference materials

[0068]

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

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Abstract

The invention discloses a method for rapidly determining lead in food, and belongs to the technical field of food detection. The method comprises the following steps: 1) selecting an instrument and a device; 2) preparing a standard curve; 3) testing; 4) setting the condition of instruments used for the experiment; and 5) calculating and expressing the result. The experiment condition is reasonable in selection; the detection data is accurate and reliable; lead in food can be subjected to solid charging determination without digestion, and pollution caused by strong acid digestion is also prevented at the same time. The method has the characteristics that the speed for detecting the lead content in food is rapid, and the quality supervision is high in timeliness; meanwhile, the defects of detection data distortion and long cycle of detection result due to incomplete digestion in the existing international method are remedied; at the same time, the detection time is shortened to 0.1 hour from more than 40 hours in the existing standard, and the need of supervising the effectiveness of the lead content in food is met.

Description

Technical field [0001] The invention belongs to the technical field of food detection, and specifically relates to a rapid determination method of lead in food. Background technique [0002] The harm of lead (Pb) to human health has aroused widespread concern from governments and consumers in various countries. All governments have adopted strict methods to protect the health of consumers when formulating lead limits in food; CAC and the European Union are based on the food safety assessment report Combined with the limit standards formulated by various countries, the limit standards for lead in various foods have been formulated. 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 National Food Safety Standard for the limit of lead in food. [0003] At present, the corresponding detection method for lead content in food is: "Determination of Lead in Food" stipu...

Claims

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Application Information

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Patent Type & Authority Applications(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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