Evaluation method for the passivation effect of nano-modifiers on heavy metals in the rhizosphere environment

A rhizosphere environment and heavy metal technology, applied in the field of soil treatment, can solve the problems of not being able to separate soil samples more accurately, and no passivation effect of heavy metals, etc., to achieve the effect of ensuring scientificity, accurate evaluation, and flexible testing

Active Publication Date: 2018-05-22
HEBEI UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Evaluation method for the passivation effect of nano-modifiers on heavy metals in the rhizosphere environment
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  • Evaluation method for the passivation effect of nano-modifiers on heavy metals in the rhizosphere environment

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Experimental program
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Effect test

Embodiment 1

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

[0055] The test plants are: rapeseed (green stem vegetable);

[0056] The passivating agent to be tested was obtained from Huize Fine Chemicals Group, Suzhou, 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 was also equipped with Cd simulated contaminated soil, that is, CdCl was added to the background contaminated soil. 2 ·H 2 O is added to the soil after being made into a solution, so that the Cd content in the soil is about 5 mg / kg respectively, and the simulated polluted soil is balanced for one month before use;

[0058] Step 2. Balance the well-balanced Cd simulated contaminated soil, add nano-montmorillonite in the proportion of 0%, 0.5%, 1%, and 2%, passivate and balance for 2 months, use nano-montmorillonite to repair cad...

Embodiment 2

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

[0070] The test plants are: lettuce;

[0071] The passivating agent tested was obtained from Huize Fine Chemicals Group in Suzhou, Jiangsu Province, and it was nano zeolite.

[0072] Step 1. In addition to the original soil, the potted test soil was also provided with Pd5 simulated contaminated soil, that is, PdCl was added to the background contaminated soil. 2 After making a solution, add it to the soil, so that the Pd content in the soil is about 5 mg / kg respectively, and the simulated polluted soil is balanced for one month before use;

[0073] Step 2, the well-balanced Pd5 simulated contaminated soil, adding nano-zeolite in proportions of 0%, 0.5%, 1%, and 2%, passivated and balanced for 2 months, used as nano-zeolite to repair cadmium-contaminated soil, and set aside; among them, 0 The amount of adding nanometer zeolite is the control group, and 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 a nano-improving agent on heavy metals in the 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 soil heavy metal pollution is still quite serious, which has brought huge challenges to our production and life. At this stage, the soil heavy metal pollution remediation technologies used in various countries mainly include chemical remediation, alien soil method and phytoremediation. Chemical remediation generally involves adding amendments to the soil, which can passivate heavy metals in the soil to a certain extent, thereby alleviating the stress of heavy metals on plants. [0003] The rhizosphere, that is, the soil around the root system affected by root growth, has received extensive attent...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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