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A pretreatment reagent and method for rapid detection of heavy metal lead in bean crops

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

Active Publication Date: 2016-10-26
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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  • A pretreatment reagent and method for rapid detection of heavy metal lead in bean crops
  • A pretreatment reagent and method for rapid detection of heavy metal lead in bean crops
  • A pretreatment reagent and method for rapid detection of heavy metal lead in bean crops

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1 The comparison of different pretreatment reagents to the recovery rate of lead extraction

[0028] The samples in this experiment are lead-rich bean crops, obtained by soaking the bean crops in lead nitrate solution for 30 days, drying the samples, crushing them, and storing them in the refrigerator.

[0029] 1.1 Determination of lead content in bean crops by national standard pretreatment method

[0030] Weigh 1.000g of soybeans into a polytetrafluoroethylene inner tank, add 3mL of nitric acid to soak for 12h, then add 4mL 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.

[0031] 1.2 The present invention discloses pretreatment reagents and methods for determining lead content in rice...

Embodiment 2

[0036] Soak broad beans in lead nitrate solution for 30 days to obtain lead-rich broad beans, dry them and crush them, accurately weigh 1.000g of broad bean samples and place them in a 25mL polytetrafluoroethylene digestion tank, add 2mL CH 3 COOH, 6mL 1-(3-sulfo)-propyl-2-pyrrolidone bisulfate ionic liquid, 4mL 100g / L aminotrimethylene phosphonate. After adding the above-mentioned treatment reagent, microwave treatment for 5 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 / T5009.12-2010): take 1.000 g of crushed rice samples and place them in a polytetrafluoroethylene inner tank, add 3 mL of nitric acid to soak overnight, and then add 3 mL of hydrogen peroxide. Close the inner lid and put in 130 o Keep in an oven at C for 4h, transfer it to a 25mL vol...

Embodiment 3

[0038] Soak mung beans in lead nitrate solution for 30 days to obtain lead-rich mung beans, dry them and crush them, accurately weigh 1.000g of mung bean samples and place them in a 25mL polytetrafluoroethylene digestion tank, add 5mL H 3 PO 4 , 3mL 1-(3-sulfonic acid)-propyl-2-pyrrolidone bisulfate ionic liquid, 2mL 100g / L amino trimethylene phosphonate. After adding the above-mentioned treatment reagent, microwave treatment for 8 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 / T5009.12-2010): take 1.000 g of crushed rice samples and place them in a polytetrafluoroethylene inner tank, add 3 mL of nitric acid to soak overnight, and then add 3 mL of hydrogen peroxide. Close the inner lid and put in 130 oKeep in an oven at C for 4h, transfer it to a 25...

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Abstract

The invention discloses a pretreatment reagent for rapidly detecting heavy metal lead in legume crops, and belongs to the field of heavy metal detection. The pretreatment reagent is prepared through mixing an ionic liquid, an inorganic acid and trimethylene phosphonate. The invention also discloses a rapid detection method using the pretreatment reagent. The reagent and the method guarantee the implementation and accuracy of rapid detection of the heavy metal lead in the legume crops, substantially improve the extraction and recovery rate of the heavy metal lead in the legume crops, make rapid detection and onsite detection of lead in the legume crops possible, effectively obstruct entrance of broad beans with the lead content exceeding standard to the market, and provide guarantee for eating of healthy broad beans.

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 lead 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. As one of the important food crops, rice is easy to accumulate the heavy metal lead, and rapid and effective detection must be carried out before it enters the market, otherwise the consequences will be disastrous. [0003...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/33G01N1/28
Inventor 孙志华
Owner 山西省科技资源与大型仪器开放共享中心