Method for removing heavy metals (Pb, Zn, Cu, Cd and As) in plants by using different acids

A technology of heavy metals and plants, applied in As), removes heavy metals (Pb, Zn, Cd, Cu) in plants, can solve the problems of high cost, secondary pollution, human and animal consumption, etc., to reduce content, reduce pollution, The effect of avoiding food safety problems

Inactive Publication Date: 2014-07-30
HUNAN AGRICULTURAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the research on soil heavy metal pollution has made some progress. Although traditional physical and chemical methods are effective in controlling soil heavy metals, they are costly, difficult to manage, easy to cause secondary pollution, and disturb the environment. However, phytoremediation has become an important means of soil purification due to its low cost, large-scale promotion and environmental friendliness; phytoremediation is to use plants to absorb, accumulate and fix heavy metal pollutants in the soil, and t...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0017] Example 1: Pipette 11ml of concentrated hydrochloric acid in 70% ethanol solution, mix well and dissolve to 100ml to obtain 4% hydrochloric acid ethanol extract, take 3g of oil sunflower cake in a clean Erlenmeyer or centrifuge bottle Add 30ml of 4% hydrochloric acid ethanol extract, then shake in a constant temperature oscillator or tumble in a rolling machine for 24 hours, repeat 3 times to reduce or reduce the heavy metals in the cake, then filter or centrifugal dehydration, and then Wash with ultrapure water 2 to 3 times to remove residual acid, and dry to obtain rapeseed meal cake from which heavy metals Pb, Zn, Cu, Cd, As have been removed. It was determined that the three removal rates of Pb in oil sunflower cake were 64.11%, 75.42% and 78.53% respectively; the three removal rates of Zn were 55.67%, 98.40% and 99.45% respectively; the three removal rates of Cu were 53.05% and 81.83% respectively and 97.25%; the three removal rates of Cd were 48.22%, 99.62% and 10...

example 2

[0018] Example two: pipette 11ml of concentrated hydrochloric acid in 60% ethanol solution, fully mix and dissolve to 100ml, obtain 4% hydrochloric acid ethanol extract, get 2g of tobacco in a clean Erlenmeyer flask, add 40ml of 4 % hydrochloric acid ethanol extraction solution, then placed in a constant temperature shaker for 24 hours, repeated 2 times to reduce or reduce the heavy metals in tobacco, then filtered or centrifugal dehydration, and then washed 2~3 times with ultrapure water to remove residual acid , and dried to obtain tobacco that removes heavy metals Pb, Zn, Cu, Cd, As. It was determined that the two removal rates of Pb in tobacco were 77.03% and 83.64%; the two removal rates of Zn were 89.53% and 95.23% respectively; the two removal rates of Cu were 45.41% and 62.70% respectively; They were 86.85% and 92.00%, respectively; the two removal rates of As were 78.71% and 91.67%, respectively.

example 3

[0019] Example three: pipette 7ml of concentrated nitric acid in 60% ethanol solution, fully mix and dissolve to 100ml, obtain 4% nitric acid ethanol extract, get 2g of tobacco in a clean Erlenmeyer flask, add 40ml of 4 % nitric acid ethanol extraction solution, then placed in a constant temperature oscillator for 24 hours, repeated 2 times to reduce or reduce the heavy metals in tobacco, then filtered or centrifugal dehydration, and then washed 2~3 times with ultrapure water to remove residual acid , and dried to obtain tobacco that removes heavy metals Pb, Zn, Cu, Cd, As. It was determined that the two removal rates of Pb in tobacco were 9.09% and 45.43% respectively; the two removal rates of Zn were 89.64% and 95.79% respectively; the two removal rates of Cu were 20.00% and 44.32% respectively; They were 90.01% and 94.39%, respectively; the two removal rates of As were 59.33% and 93.39%, respectively.

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PUM

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Abstract

The invention discloses a method for removing heavy metals (Pb, Zn, Cu, Cd and As) in plants by using different acids. The method is characterized in that heavy metals in dry matters of plants such as tobaccos, pastures (sudangrass, grain amaranth, endive, sowthistle-leaf Ixeris and rumex), vegetables and dreg cakes are extracted by using ethyl alcohol leach liquor of the acids as an extraction agent through vibration and rolling, so that the content of the heavy metals in the plants is reduced, the pollution to environments is reduced, and the food safety problem caused by excessive heavy metals is avoided.

Description

technical field [0001] The invention relates to a method for removing heavy metals (Pb, Zn, Cu, Cd, As) in plants by using different acids. Background technique [0002] With the rapid development of mining and metallurgical industries, the excessive use of chemical fertilizers and agriculture has released a large amount of heavy metals into the environment, making the problem of heavy metal soil pollution increasingly serious. According to the latest survey report, the total point exceeding standard rate of my country's soil is 16.1%, and the point exceeding standard rate of cadmium, mercury, arsenic, copper, lead, chromium, zinc and nickel is 7.0%, 1.6%, respectively. 2.7%, 2.1%, 1.5%, 1.1%, 0.9%, 4.8%; the problem of soil pollution has caused the content of heavy metals such as Cd, Cu, As, Pb in food, vegetables and fruits to exceed the national standard. Due to the hidden, long-term and irreversible characteristics of heavy metals in the soil. Therefore, the remediation...

Claims

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Application Information

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IPC IPC(8): B09C1/08
Inventor 曾清如黎红亮杨洋葛一陈
Owner HUNAN AGRICULTURAL UNIV
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