Passivating agent for controlling Cd pollution of vegetable field, and use method thereof

A passivating agent and vegetable field technology, applied in the field of soil improvement and environmental protection, can solve the problems of increased risk of heavy metal pollution, difficult to achieve repair application, and unsatisfactory repair effect, so as to achieve good resource utilization and improve crop yield. Yield and quality, the effect of saving manpower and material resources

Active Publication Date: 2013-06-12
INST OF AGRI RESOURCES & ENVIRONMENT GUANGDONG ACADEMY OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, due to the increased risk of heavy metal pollution in the soil, the repair effect of a single organic or inorganic passivator is often not ideal, and there are problems such as unstable effect, large application amount, or damage to soil quality by passivators, making it difficult to achieve restoration. Applied Standards

Method used

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  • Passivating agent for controlling Cd pollution of vegetable field, and use method thereof
  • Passivating agent for controlling Cd pollution of vegetable field, and use method thereof
  • Passivating agent for controlling Cd pollution of vegetable field, and use method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1 Culture test

[0032] Weigh raw materials (kg) according to the following weights: decomposed peanut bran 1.0, lime 4.5, ammonium humate 4.5.

[0033] Grind the above raw materials through a 60-mesh sieve, and mix well to obtain a passivator.

[0034] Adsorption effect test of passivating agent on cadmium:

[0035] According to the content ratio of passivating agent (0%, 0.5%, 1%, 2.5%, 5%, 7.5%, 10%), weigh 4.000 g of passivating agent and soil respectively in a 50ml centrifuge tube, add Contains 0.1 mol / L NaNO 3The solution was used as a supporting electrolyte, and then 5 mL of cadmium stock solution was pipetted so that the final concentration of cadmium in the centrifuge tube was 5 mg / L, shaken on a reciprocating shaker at 25 °C for 4 h, left to stand for 24 h, centrifuged, and filtered. Take the supernatant to measure the cadmium concentration, and calculate the adsorption rate (the amount of heavy metal adsorbed by the soil / the content in the solu...

Embodiment 2

[0043] Embodiment 2 Pot application

[0044] The passivation effect of the passivating agent of the present invention and its application method on the cadmium activity of the southern vegetable field soil was preliminarily investigated by using potted plants. The contaminated soil 1 of Example 1 was selected as the test soil, and its physical and chemical properties are shown in Table 1.

[0045] Pot experiment is provided with 8 treatments: (1) contrast 1, does not apply passivator of the present invention, plant red amaranth; (2) low consumption, 1 g / kg (passivator / soil), plant red amaranth; (3 ) medium dosage, 5 g / kg (passivator / soil), plant red amaranth; (4) higher dosage, 10 g / kg (passivator / soil), plant red amaranth. (5) Control 2, without applying the passivating agent of the present invention, planting pakchoi; (6) low dosage, 1 g / kg (passivating agent / soil), planting pakchoi; (7) medium dosage, 5 g / kg kg (passivator / soil), plant pakchoi; (8) higher dosage, 10 g / k...

Embodiment 3

[0051] Embodiment 3: field application

[0052] The test site is located in the suburb of Guangzhou where leafy vegetables are grown all the year round. The soil physical and chemical properties are: soil pH 5.37, organic matter 28.8 g / kg, total N 1.91 g / kg, alkaline nitrogen 126 mg / kg, available phosphorus 79 mg / kg, available Potassium 112 mg / kg, total cadmium 0.58 mg / kg, DTPA-Cd content 0.33 mg / kg. Three treatments were set up in the test: (1) control, no passivating agent was applied; (2) 100 kg / mu of passivating agent of the present invention was applied; (3) 200 kg / mu of passivating agent of the present invention was applied; (4) passivating agent of the present invention was applied. Invention passivator 400 kg / mu. Each treatment was repeated 4 times. The area of ​​each plot is 10.0 m 2 , planting mustard greens.

[0053] Weigh raw materials (kg) according to the following weights: decomposed peanut bran 50, lime 240, ammonium humate 210.

[0054] Before planting ...

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Abstract

The invention discloses a passivating agent for controlling the Cd pollution of a vegetable field, and a use method thereof. The passivating agent comprises 9.3-14.0 parts by mass of decomposed peanut bran, 41.3-53.7 parts by mass of lime, and 36.7-50.0 parts by mass of ammonium humate. The use method of the passivating agent comprises the following steps: grinding the decomposed peanut bran, lime and ammonium humate before planting vegetables, sieving by a 60 mesh sieve, fully and uniformly mixing to obtain the passivating agent, carrying out complete basal application of 150-300kg of the above mixture to each 666.7m<2> of the field, plowing, uniformly raking to uniformly mix the passivating agent with polluted soil, spraying water, balancing for 5-10 days, and sowing or transplanting. The passivating agent has the advantages of wide sources of the above raw materials, simple preparation method, effective reduction of the content of available-state cadmium in soil, prevention of Cd from entering the food chain, improvement of the adverse physical and chemical properties of the soil, and realization of the continuous safe utilization of Cd polluted vegetable fields.

Description

technical field [0001] The invention belongs to the technical field of soil improvement and environmental protection, and in particular relates to a passivator for controlling Cd pollution in vegetable fields and an application method thereof. Background technique [0002] With the acceleration of urbanization and industrialization, the discharge of urban domestic waste and industrial "three wastes" is increasing, coupled with the unreasonable application of sludge, pesticides, garbage fertilizers, etc., a considerable number of vegetable soils have accumulated heavy metals, especially The cadmium content was significantly higher than the background value of the soil, and the cadmium pollution in the vegetable field soil was common, and most of them were moderate to light pollution. Because the soil in southern my country is acidic, the activity of heavy metals in the soil is high, and its potential ecological risk level is also high. These soils are often mainly planted wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40A01B77/00A01B79/02C09K101/00
Inventor 杨少海
Owner INST OF AGRI RESOURCES & ENVIRONMENT GUANGDONG ACADEMY OF AGRI SCI
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