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Evaluating method for passivation effect of nanometer modifier to heavy metal in rhizosphere environment

A technology for rhizosphere environment and heavy metals, applied in the field of soil treatment, can solve the problems of inability to separate soil samples more accurately, no passivation effect of heavy metals, etc., and achieve the effect of ensuring scientificity, accurate evaluation, and flexible testing.

Active Publication Date: 2017-06-20
HEBEI UNIVERSITY
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  • Application Information

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Problems solved by technology

The rhizosphere is a special area formed by the intersection of the plant ecosystem and the soil ecosystem. Due to the influence of the physiological process of the plant root system, the rhizosphere soil has great differences in physical, chemical and biological characteristics compared with the non-rhizosphere soil. Therefore, the improvement effect of the same amendment on the soil of different crops may be very different; therefore, whether different amendments can really alleviate the stress effect of heavy metals on different plants remains to be determined. At present, the existing research on the rhizosphere environment cannot accurately separate soil samples at different distances from the root chamber, so there is no scientific assessment of the passivation effect of heavy metals in the rhizosphere environment method

Method used

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  • Evaluating method for passivation effect of nanometer modifier to heavy metal in rhizosphere environment
  • Evaluating method for passivation effect of nanometer modifier to heavy metal in rhizosphere environment
  • Evaluating method for passivation effect of nanometer modifier to heavy metal in rhizosphere environment

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Embodiment 1

[0054] The soil for testing is: taken from the topsoil (0-20cm) of Caohe Bridge, Baoding City, Hebei Province;

[0055] The tested plants are: rape (green stems);

[0056] The passivation agent tested was taken from Suzhou Huize Fine Chemical Collection, Jiangsu Province, and it was calcium-based nano-montmorillonite with a montmorillonite content of 95%.

[0057] Step 1. In addition to the original soil, the potted test soil is also set up with Cd simulated polluted soil, that is, CdCl is added on the background polluted soil. 2 ·H 2 O is added to the soil after being prepared into a solution, so that the Cd content in the soil is about 5 mg / kg to simulate the contaminated soil balance for one month and then used for later use;

[0058] Step 2: Add nano-montmorillonite in proportions of 0%, 0.5%, 1%, and 2% to simulate contaminated soil with balanced Cd, passivation and balance for 2 months, and use nano-montmorillonite to repair cadmium-contaminated soil for use as a backu...

Embodiment 2

[0069] The soil for testing is: taken from the topsoil (0-20cm) of Caohe Bridge, Baoding City, Hebei Province;

[0070] The tested plants are: lettuce;

[0071] The passivation agent tested was taken from Suzhou Huize Fine Chemical Collection, Jiangsu Province, and it was a nano-zeolite.

[0072] Step 1. In addition to the original soil, the potted test soil is also set up with Pd5 simulated polluted soil, that is, PdCl is used on the background polluted soil. 2 After making up the solution, add it to the soil, so that the Pd content in the soil is about 5mg / kg to simulate the contaminated soil balance for one month and then use it for later use;

[0073] Step 2: The balanced Pd5 simulated polluted soil is added with nano-zeolite in proportions of 0%, 0.5%, 1%, and 2%, passivation and balance for 2 months, as the nano-zeolite to repair the cadmium-contaminated soil, for use; wherein, 0 % of nano-zeolite was added as the control group, and the remaining three groups were the ...

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Abstract

The invention discloses an evaluating method for a passivation effect of a nanometer modifier to heavy metal in rhizosphere environment. The evaluating method comprises the following steps of preparing contaminated soil; preparing nanometer modifier remediated soil; evenly distributing and feeding the contaminated soil and the nanometer modifier remediated soil into all areas of root boxes to serve as a control group and an experiment group and sowing the same crop into root growth chambers of all the root boxes to be cultured into crop samples; sampling and detecting; destructively collecting crop samples and soil samples in the root boxes of the experiment group and the control group at certain intervals; judging whether the nanometer modifier has a passivation effect on heavy metal in the rhizosphere environment according to comparative results of the total heavy metal amount of all the samples. The evaluating method disclosed by the invention can limit crop roots in a certain area through the root boxes, achieves the purpose of more accurately separating soil samples with different distances to the root chambers, can detect the heavy metal content, accordingly accurately evaluates the passivation effect of the nanometer modifier to the heavy metal in the rhizosphere environment and provides theoretical guidance for actual production.

Description

technical field [0001] The invention relates to the technical field of soil treatment, in particular to a method for evaluating the passivation effect of nanometer modifiers on heavy metals in rhizosphere environment. Background technique [0002] From the National Soil Pollution Survey Bulletin released by the Ministry of Environmental Protection in 2014, it is obvious that heavy metal pollution in soil is still quite serious, which brings huge challenges to our production and life. At this stage, the soil heavy metal pollution remediation technologies applied in various countries mainly include chemical remediation method, foreign soil method and phytoremediation method. The chemical remediation method is generally to add amendments to the soil. The amendments can passivate heavy metals in the soil to a certain extent, thereby alleviating the stress effect of heavy metals on plants. [0003] The rhizosphere, the soil around the root system affected by root growth, has rec...

Claims

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Application Information

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IPC IPC(8): G01N33/24G01N33/00
CPCG01N33/0098G01N33/24
Inventor 刘微赵陈晨左清青梁淑轩牛琳安泽宇刘红梅赵春霞
Owner HEBEI UNIVERSITY
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