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Pretreatment reagent and method for rapid detection of heavy metal cadmium in grain crops

A technology of heavy metals and reagents, which is applied in the field of heavy metal detection, can solve the problems of inability to improve equipment utilization efficiency and long pretreatment time, and achieve the effects of ensuring practicability, increasing extraction recovery rate, and accelerating consumption

Active Publication Date: 2015-10-28
山西省科技资源与大型仪器开放共享中心
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The pretreatment time of these methods is long, and the utilization efficiency of the equipment cannot be improved.

Method used

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  • Pretreatment reagent and method for rapid detection of heavy metal cadmium in grain crops
  • Pretreatment reagent and method for rapid detection of heavy metal cadmium in grain crops
  • Pretreatment reagent and method for rapid detection of heavy metal cadmium in grain crops

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1 The comparison of different pretreatment reagents to the recovery rate of cadmium extraction

[0031] The sample in this experiment is cadmium-rich rice, which is obtained by soaking the rice in cadmium nitrate solution for 15 days. The sample is dried in the sun, crushed, and stored in a refrigerator.

[0032] 1.1 Determination of cadmium content in cereal crops by national standard pretreatment method

[0033] Weigh 1.000g of the sample into a polytetrafluoroethylene inner tank, add 2-4mL of nitric acid to soak for 12h, then add 2mL of hydrogen peroxide, cover the inner cover, put it into a constant temperature drying oven, and dry it at 130 o Keep at C for 4 hours, and after cooling to room temperature, transfer the digestive solution into a 25mL volumetric flask for constant volume; at the same time, conduct a blank control test throughout the process.

[0034] 1.2 The present invention discloses pretreatment reagents and methods for determining cadmium c...

Embodiment 2

[0038] Soak wheat in cadmium nitrate solution for 15 days to obtain cadmium-rich cereal crops, dry them and crush them, accurately weigh 1.000g of cereal crop samples and place them in a 25mL polytetrafluoroethylene digestion tank, add 1mL 30% hydrogen peroxide, 3mL N-ethylpyridine hexafluorophosphate, 6mL 200g / L citric acid. After adding the above-mentioned treatment reagent, microwave treatment for 3 minutes, then add a certain amount of NaOH solution to neutralize it to near neutrality, transfer it to a 25mL volumetric flask after cooling, and add deionized water to dilute to 25mL. At the same time, the sample was processed according to the national standard method (GB / T5009.15-2003): take 1.000 g of the pulverized sample and put it in a polytetrafluoroethylene inner tank, add 3 mL of nitric acid to soak overnight, and then add 2 mL of 30% hydrogen peroxide. Close the inner lid and put in 130 o Keep in an oven at C for 4h, transfer it to a 25mL volumetric flask after cooli...

Embodiment 3

[0040] Soak corn in cadmium nitrate solution for 15 days to obtain cadmium-rich cereal crops, dry them and crush them, accurately weigh 1.000g of cereal crop samples and place them in a 25mL polytetrafluoroethylene digestion tank, add 3mL 30% hydrogen peroxide, 6mL N-ethylpyridine acetate, 2mL 200g / L citric acid. After adding the above-mentioned treatment reagent, microwave treatment for 7 minutes, then add a certain amount of NaOH solution to neutralize it to near neutrality, transfer it to a 25mL volumetric flask after cooling, and add deionized water to dilute to 25mL. At the same time, the samples were processed according to the national standard method (GB / T5009.15-2003): 1.000 g of crushed cereal crop samples were placed in a polytetrafluoroethylene inner tank, soaked overnight in 3 mL of nitric acid, and then added with 2 mL of hydrogen peroxide. Close the inner lid and put in 130 oKeep in an oven at C for 4h, transfer it to a 25mL volumetric flask after cooling to roo...

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Abstract

The invention discloses a pretreatment reagent for rapid detection of heavy metal cadmium in grain crops and belongs to the field of heavy metal detection. The pretreatment reagent is formed by mixing ionic liquid, hydrogen peroxide and a citric acid solution, and a method for rapid detection through the pretreatment reagent is further introduced. The implementability and the accuracy of rapid detection of the heavy metal cadmium in grain crops are ensured, the extraction recovery rate of the heavy metal in grain crops can be obviously increased, a possibility is provided for rapid detection and field detection of cadmium in grain crops, grain crops with the cadmium content exceeding the standard are effectively prevented from entering the market to circulate, and a guarantee is provided for people eating the healthy grain crops.

Description

technical field [0001] The invention belongs to the field of heavy metal detection, in particular to a pretreatment reagent and method for rapid detection of heavy metal cadmium in crops. Background technique [0002] With the rapid development of our country's economy, the extraordinary industrial production has caused serious environmental pollution. People's daily life is full of wastes containing heavy metals (such as batteries, electrical equipment, etc.), and these wastes have not been effectively managed and disposed of, which further aggravates the pollution and harm of heavy metals. When heavy metals migrate and transform through the soil-plant system, and accumulate and amplify through the food chain, they will cause greater toxicity to organisms. Cereal crops, as one of the three major food crops, are prone to enrichment of heavy metal cadmium, and rapid and effective detection must be carried out before entering the market, otherwise the consequences will be dis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/44
Inventor 孙志华
Owner 山西省科技资源与大型仪器开放共享中心
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