Method for determining harmful element lead or cadmium in food additive

A technology for food additives and elemental lead, which is applied in measuring devices, color/spectral characteristic measurement, material analysis through optical means, etc. It can solve problems such as large background interference, deviation of measurement results, and great influence on measurement results.

Pending Publication Date: 2022-03-25
湖北省兴发磷化工研究院有限公司
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  • Description
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Problems solved by technology

[0002] Using graphite furnace atomic absorption to measure lead in food additive phosphate is convenient, quick and accurate. However, the composition of food additives is complex, and its background interference is large, which has a great impact on the determination results. The national standard recommends the use of matrix improvement. agent, that is, when using graphite furnace atomic absorption measurement, first inject 5 μL of matrix modifier or the same volume as the sample, and then inject 20 μL of sample (standard sample), and then perform combustion measurement. According to the standard, ammonium dihydrogen phosphate is used as the improvement The influence of different modifiers can eliminate the background, but the measurement results will be biased, and the recovery rate of the standard addition is low. Therefore, this study explores the influence of different modifiers on the measurement results and stability.

Method used

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  • Method for determining harmful element lead or cadmium in food additive
  • Method for determining harmful element lead or cadmium in food additive
  • Method for determining harmful element lead or cadmium in food additive

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Instrument model used: PerkinElmer PinAAcle D900 atomic absorption spectrophotometer

[0025] When the graphite furnace atomic absorption spectrophotometer is used for the determination of harmful elements such as lead and cadmium in food additive phosphate, the different ratios of the matrix modifier and the sample solution (standard sample) are discussed, and it includes the following steps:

[0026] 1) Use a 1000mg / L lead standard solution to prepare a 10mg / L standard solution;

[0027] 2) Use 10mg / L lead standard solution to prepare 100μg / L lead standard solution;

[0028] 3) Prepare 20 μg / L lead standard with 100 μg / L lead standard solution, specific steps: pipette 12.50 ml of 100 μg / L lead standard into a 50 mL volumetric flask, add a certain volume of ammonium dihydrogen phosphate matrix modifier, Use 1% nitric acid (volume concentration) to make up to the scale, shake well, use 1% nitric acid (volume concentration) as standard blank, use graphite furnace atomic...

Embodiment 2

[0034] Change the matrix improver in embodiment 1 into diammonium hydrogen phosphate solution (20g / L), step is the same as embodiment 1, draw standard curve and see attached figure 2 , the measurement results are shown in Table 2:

[0035] Table 2-diammonium hydrogen phosphate solution is used as matrix improver determination result (71% of standard addition recovery rate)

[0036]

[0037]

Embodiment 3

[0039] Change the matrix improver in embodiment 1 into ammonium nitrate solution (20g / L), step is with embodiment 1, standard curve sees attached image 3 , the measurement results are shown in Table 3:

[0040] Table 3—Ammonium nitrate solution is used as matrix improver determination result (87% of standard addition recovery rate)

[0041]

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Abstract

The invention belongs to the field of food additive detection and analysis, and particularly relates to a method for determining harmful elements lead and cadmium in a food additive by graphite furnace atomic absorption, which needs to add a matrix modifier to eliminate the influence of background. The invention discusses the influence of different matrix improvers on the determination result, namely the influence of ammonium dihydrogen phosphate, diammonium hydrogen phosphate, ammonium nitrate and ammonium dihydrogen citrate as the matrix improvers on the determination result and the result stability. And finally, the improver with the minimum influence on the determination result and the most stable result is determined.

Description

technical field [0001] The invention relates to the field of detection and analysis of food additives. Heavy metal pollution in food threatens food safety. As an important component of food, the content of heavy metal elements in food additives must be strictly controlled. Lead and cadmium are the main components of heavy metal contamination in food. Background technique [0002] Using graphite furnace atomic absorption to measure lead in food additive phosphate is convenient, quick and accurate. However, the composition of food additives is complex, and its background interference is large, which has a great impact on the determination results. The national standard recommends the use of matrix improvement. agent, that is, when using graphite furnace atomic absorption measurement, first inject 5 μL of matrix modifier or the same volume as the sample, and then inject 20 μL of sample (standard sample), and then perform combustion measurement. According to the standard, ammoni...

Claims

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Application Information

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IPC IPC(8): G01N21/31G01N21/01
CPCG01N21/3103G01N21/01G01N2021/0112
Inventor 卢会珍杜建侠荣沙沙李红肖清燕余晓英徐玮
Owner 湖北省兴发磷化工研究院有限公司
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