Method for detecting contents of lead, chromium, cadmium and copper in food

A detection method and technology of copper content, applied in the detection of cadmium and copper content, lead and chromium in milk and dairy products, can solve the problems of high labor intensity, different pretreatment steps, long detection working time, etc., and achieve The effects of far-reaching environmental protection, optimization of the pre-treatment process, and high work efficiency

Inactive Publication Date: 2017-01-04
INNER MONGOLIA MENGNIU DAIRY IND (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, when the product needs to detect the four elements of lead, chromium, cadmium and copper, the pretreatment steps of the detection methods for the above four elements in the prior art are different, so the detection of the four elements of lead, chromium, cadmium and copper in a sample Four samples need to be processed before instrumental detection
The sample pretreatment steps are cumbersome, the whole testing time is long, the staff labor i

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1 : preprocessing method.

[0016] 1. Reagents and solutions:

[0017] Nitric acid solution with a volume fraction of 63%: commercially available concentrated nitric acid solution, superior grade;

[0018] 0.5mol / L nitric acid solution: Accurately absorb 32mL concentrated nitric acid (superior pure), add it into a beaker filled with 100mL ultrapure water, mix well, transfer to a 1000mL volumetric flask after cooling, and use an ultrapure level to determine the volume to 1000mL and mix well.

[0019] 2. Pretreatment of samples to be tested (parallel operation when multiple samples are involved):

[0020] 1) Weigh a certain amount (about 5.0g) of milk samples to be tested, 5.3690g (sample 1), 4.7693g (sample 2) and 1.2051g (sample 3) and 1.1563g (sample 4) of milk powder samples, and place them in the electric heating Heat the plate at 60-80°C until it is completely carbonized to obtain a carbonized sample;

[0021] 2) Transfer the carbonized sample into t...

Embodiment 2

[0025] Example 2 :Detection method.

[0026] 1. Reagents and solutions:

[0027] Standard solution of lead, chromium, cadmium, and copper elements: absorb lead, chromium, cadmium, and copper element standard stock solutions with a mass concentration of 1000 μg / mL of lead, chromium, cadmium, and copper elements as shown in the following table, and configure 10ug respectively / ml, 1ug / ml concentration of the standard intermediate solution in a 100mL volumetric flask, with a mass fraction of 0.5mol / l nitric acid solution to volume, and mix. Prepare standard solutions of lead, chromium, cadmium, and copper elements with different mass concentrations as shown in Table 1.

[0028] Table 1. Mass concentrations of standard solutions of lead, chromium, cadmium, and copper elements

[0029] Numbering Lead standard solution (ng / ml) Chromium standard solution (ng / ml) Cadmium standard solution (ng / ml) Copper standard solution (ug / ml) 1 5 1 1 0.05 2 10 ...

Embodiment 3

[0040] Example 3 : precision test.

[0041] Obtain lead, chromium, cadmium, copper element content according to the inspection method of embodiment 2, calculation precision is as shown in table 4:

[0042] Table 4. Precision Tests

[0043] Lead element content (mg / kg) Chromium content (mg / kg) Cadmium element content (mg / kg) Copper content (mg / kg) 1 0.0132 0.0149 0.0100 0.375 2 0.0130 0.0151 0.0098 0.330 3 0.0129 0.0149 0.0096 0.345 4 0.0133 0.0158 0.0092 0.358 5 0.0128 0.0143 0.0091 0.353 6 0.0133 0.0141 0.0090 0.399 7 0.129 0.0158 0.0091 0.351 Standard DeviationRSD% 1.62 4.40 4.21 6.23

[0044] It can be seen from Table 4 that the detection RSDs of the four elements are all less than 10%, and the precision test meets the methodological requirements.

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Abstract

The invention provides a method for detecting contents of lead, chromium, cadmium and copper in food, wherein the method comprises the following steps: weighing a food sample, putting the food sample on an electric heating plate, and carrying out carbonization treatment, to obtain a sample after carbonization; introducing the sample after carbonization into a muffle furnace, and carrying out ashing treatment, to obtain a sample after ashing; adding a 0.5 mol/L nitric acid solution to the sample after ashing, and mixing evenly to obtain a to-be-detected sample liquid; introducing the to-be-detected sample liquid into an instrument, and carrying out instrument detection of the contents of lead, chromium, cadmium and copper, wherein the instrument is an atomic absorption spectrophotometer. According to the method for detecting the contents of lead, chromium, cadmium and copper in the food, the instrument detection of the four elements can be simultaneously carried out through one-time food sample pretreatment, the steps are simple, the working efficiency is high, and moreover, the test data precision and the recovery rate both can meet needs of analysis work.

Description

technical field [0001] The invention relates to a detection method for lead, chromium, cadmium and copper content in food, in particular to a detection method for lead, chromium, cadmium and copper content in milk and dairy products. Background technique [0002] Lead, chromium, cadmium, and copper are heavy metals that are known to be very toxic and have a serious impact on human health after long-term consumption. They are all important elements for food hygiene supervision. At present, in order to monitor the quality of raw materials, semi-finished products and finished products, it is necessary to measure the content of lead, chromium, cadmium and copper in a large number of food samples through instruments. In order to truly achieve the purpose of quality control, it is necessary to issue timely and accurate test results in a short period of time in the actual testing work. [0003] However, when the product needs to detect the four elements of lead, chromium, cadmium ...

Claims

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Application Information

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IPC IPC(8): G01N21/31
Inventor 其其格常建军乌尼尔高娃满都呼扎木则仁宋晓东
Owner INNER MONGOLIA MENGNIU DAIRY IND (GRP) CO LTD
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