On-site detection method for content of heavy metal elements in aquatic products

A technology for on-site detection and element content, applied in the field of heavy metal detection, can solve problems such as inability to apply on-site detection and complex electrode processing, and achieve the effects of portable equipment and reagents, simple electrode processing methods, and stable detection systems.

Active Publication Date: 2021-07-23
NAT INST OF METROLOGY CHINA +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Chinese patent CN 111638260 A discloses "a detection method for heavy metals in dried aquatic food". The pretreatment method used in this patent is microwave digestion method, which cannot be applied to on-site detection, and the electrode processing is complicated

Method used

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  • On-site detection method for content of heavy metal elements in aquatic products
  • On-site detection method for content of heavy metal elements in aquatic products
  • On-site detection method for content of heavy metal elements in aquatic products

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] An on-site detection method for the content of heavy metal elements in aquatic products uses equipment including sample pretreatment equipment, sample analysis equipment, several reagents and test analysis consumables.

[0048] Sample pretreatment equipment includes: small grinder (grinding cup size 200mL ~ 1000mL), small centrifuge, electronic balance, adjustable pipette. The sample analysis equipment is: portable electrochemical workstation (three-electrode system: glassy carbon electrode, silver / silver chloride electrode, platinum electrode). Commercially available; crayfish matrix reference material (standard sample of freeze-dried powder of aquatic products, cadmium content: 0.003-0.960 mg / kg) prepared by homogenizing and freeze-drying, and determined by inductively coupled plasma mass spectrometry (ICP-MS). Mercury chloride, sodium tetraborate decahydrate, sodium diacetate, hydrochloric acid, Aladdin Reagent Company; the reagents used were of superior grade, and t...

Embodiment 2

[0062] The difference between this example and Example 1 is that 10ml of 0.2mol / L hydrochloric acid is used for shaking and dissolving, the concentration of the sodium diacetate solution is 15%, the enrichment voltage is -1350mV, the enrichment time is 100s, and the mixture is stirred. The time is 6s, the holding voltage is -950mV, the holding time is 13s, the scanning start voltage is -950V, the scanning end voltage is -450mV, the scanning rate is 450mV, the cleaning voltage is 38mV, and the cleaning time is 4s.

Embodiment 3

[0064] The difference between this example and Example 1 is that 10 ml of 0.6 mol / L hydrochloric acid is used for shaking and dissolving, the concentration of the sodium diacetate solution is 5%, the enrichment voltage is -1250mV, the enrichment time is 120s, and stirring The time is 4s, the holding voltage is -850mV, and the holding time is 11s; the scanning start voltage is -850mV, the scanning end voltage is -350mV, the scanning rate is 550mV, the cleaning voltage is 42mV, and the cleaning time is 6s.

[0065] The traditional wet digestion method needs to use concentrated acid, and the pH needs to be adjusted after the digestion is completed to detect. In order to meet the needs of fast and efficient on-site detection, the stability of direct detection without adjusting the pH of the extract is studied. Prepare (0.2-1.0) mol / L hydrochloric acid solution, extract the crayfish matrix reference material, and analyze it by anodic stripping voltammetry. Such as figure 1 As show...

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Abstract

The invention discloses an on-site detection method for the content of heavy metal elements in an aquatic product, which comprises the following steps: cleaning the aquatic product to be detected, taking edible parts, and performing grinding; weighing a certain amount of aquatic products to be detected, the aquatic product freeze-dried powder blank sample and the aquatic product freeze-dried powder standard sample, and respectively adding dilute acid for extraction; centrifuging the leach liquor, and taking supernatant liquor; and adding an electrolyte into the extract liquid to respectively obtain an aquatic product to-be-detected liquid, a blank sample to-be-detected liquid and a standard sample to-be-detected liquid, calibrating the electrochemical workstation by using the blank sample to-be-detected liquid and the standard sample to-be-detected liquid, and then analyzing the aquatic product to-be-detected liquid by using the calibrated electrochemical workstation to obtain a detection result of the heavy metal elements in the to-be-detected sample. The detection work of the heavy metal elements in the aquatic products can be completed on the inspection site, and meanwhile pollution data of the heavy metal elements in the aquatic products can be rapidly and accurately obtained.

Description

technical field [0001] The invention relates to a method for detecting heavy metal content and belongs to the technical field of heavy metal detection. Background technique [0002] Aquatic products are rich in nutritional value and delicious, and are deeply loved by consumers. However, with the rapid development of social industrialization, the pollution of heavy metal elements in the water environment is increasing day by day. The content of heavy metal elements in aquatic products has attracted widespread attention from all walks of life, and has become one of the important reasons for restricting the edible safety of aquatic products. Heavy metals are typical refractory and cumulative pollutants, which can pass through the food chain and accumulate in the ecosystem. Under certain conditions, they can also be transformed into more toxic metal-organic compounds. The detection of heavy metal elements in aquatic products is important to ensure food safety. important part of...

Claims

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Application Information

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IPC IPC(8): G01N1/28G01N27/26G01N27/30
CPCG01N1/28G01N27/26G01N27/30
Inventor 马康王以堃
Owner NAT INST OF METROLOGY CHINA
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