Method for detecting heavy metals in aquatic product dried food

A detection method and heavy metal technology, applied in the preparation of test samples, measuring devices, instruments, etc., can solve the problems of high test cost, expensive equipment, low sensitivity, etc., and achieve good application prospects

Pending Publication Date: 2020-09-08
曹峰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the former two equipments are expensive and the test cost is high, while the latter is not sensitive and the operation is cumbersome.

Method used

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  • Method for detecting heavy metals in aquatic product dried food
  • Method for detecting heavy metals in aquatic product dried food

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0049] This embodiment aims to clarify the detection method about heavy metals in aquatic product dry food that the present invention designs, and all chemicals used in the present embodiment are analytical pure; All glass instruments are all soaked 24h with 10% concentrated nitric acid, and with Rinse with deionized water repeatedly and then dry it; the dried aquatic products used are dried carp purchased in the market; the specific detection method is as follows:

[0050] 1. Sample pretreatment

[0051] Wash and infiltrate the dried carp with deionized water; then remove the head, tail and bone spurs; grind and homogenize the processed samples respectively, place them in sample cups, and store them at -20°C after numbering.

[0052] 2. Digestion treatment

[0053] 21. Pretreatment for Pb and Cd determination

[0054] Weigh 0.4g of dried carp after pretreatment and place it in a digestion tank, add 5mL of MOS grade nitric acid, heat at a constant temperature of 145°C, and add...

experiment example 1

[0074] Experimental example 1 is based on the method used in the above application example, and aims to clarify the use of graphene / Bi / Nafion composite materials as electrodes, and the use of anodic stripping voltammetry to detect traces of heavy metals Pb and Cd in dried aquatic products. quantity.

[0075] Put 5 mL of the digestion solution prepared in steps 31, 32, and 33 of the above-mentioned embodiment into the electrochemical detection cell, and perform quantitative analysis by the standard addition method.

[0076] figure 1 The stripping voltammogram of Pb and Cd in aquatic products was detected for graphene / Bi / Nafion composite material as an electrode. From figure 1 It can be seen that the dissolution peaks of Pb and Cd appear at -0.63V and -0.89V. Adding 2μg / L of Pb and Ca as a standard will increase the peak current significantly, and accurately detect the traces of Pb and Cd in aquatic products. Through calculation, the contents of Pb and Cd in the aquatic prod...

experiment example 2

[0080] Experimental Example 2 is based on the method used in the above application examples, and aims to clarify the use of Au / graphene composite materials as electrodes to detect traces of heavy metals Pb and Cd in dried aquatic products using anodic stripping voltammetry.

[0081] In this experiment, the Au / graphene composite electrode was applied to detect trace Hg by voltammetry. The linear range of Hg is as figure 2 shown, for 5x10 -10 ~5x10 -9 mol / L.

[0082] From figure 2 It can be seen that at low concentrations, the Au / graphene composite electrode has an excellent electrochemical response to Hg, and the stripping peak current has a good linear relationship with the mercury concentration, and the correlation coefficients are 0.9975 and 0.9980, respectively. That is, the lower the mercury concentration, the higher the sensitivity. Au / graphene composite electrode has a detection limit of 3x10 for Hg -10 mo / L (0.06ug / L).

[0083] The reason why the Au / graphene co...

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Abstract

The invention relates to the technical field of food detection, in particular to a method for detecting heavy metals in dried aquatic food. The method comprises the following steps: preparing a graphene/Bi/Nafion composite material by using an electrochemical deposition method, and using the graphene/Bi/Nafion composite material as a working electrode for detecting trace amounts of heavy metals Pband Cd in a digestion solution; and preparing an Au/graphene composite material by using a microwave radiation method, and using the Au/graphene composite material as a working electrode to detect the trace amount of heavy metal Hg in the digestion solution. The trace amount of the heavy metal in the dried aquatic product is determined by using the anodic stripping voltammetry, and compared witha traditional mercury electrode, the electrode designed by the invention is an environment-friendly electrode and does not cause secondary pollution to the environment; compared with a traditional spectrum detection method, the detection method designed by the invention has the characteristics of simple operation, short analysis time and low instrument preparation cost, so that the detection method has a good application prospect in detection of heavy metals in dried aquatic products.

Description

technical field [0001] The invention relates to the technical field of food detection, in particular to a detection method for heavy metals in dried aquatic food. Background technique [0002] Food quality and safety issues have penetrated into all aspects of society and have become the focus of attention in recent years. Heavy metals are cumulative pollutants that widely exist in the ecological environment. Once ingested by animals, they can be passed and enriched step by step through the food chain. Under certain conditions, they may be transformed into more toxic metal-organic compounds, affecting human health. health. Aquatic products have a strong ability to enrich heavy metals, especially lead, cadmium, mercury, arsenic and other elements, especially shellfish. Therefore, the detection of heavy metals in aquatic products is of great significance for evaluating the food safety of aquatic products. [0003] At present, there are many methods for determining the conten...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/48G01N27/30G01N1/28G01N1/44
CPCG01N27/48G01N27/308G01N1/28G01N1/44
Inventor 曹峰
Owner 曹峰
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