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Passivation antagonism regulator for reducing Cd pollution of winter wheat and preparation method of passivation antagonism regulator

A regulator and cadmium pollution technology, applied in the field of passivation antagonist regulator and preparation thereof, can solve the problems of high secondary pollution risk, high cost, affecting crop yield and the like, and achieve the reduction of bioavailability, absorption and protection Effects of Repair and Efficiency

Active Publication Date: 2017-12-29
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Abstract
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  • Application Information

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Problems solved by technology

[0005] The embodiment of the present invention provides a passivation antagonist regulator for reducing cadmium pollution in winter wheat and its preparation method to solve the lack of pertinence caused by the use of chemical passivation repair technology in the prior art, often requiring the application of a large amount of passivation agent In order to achieve a specific effect, there are problems of high cost, affecting crop yield, and high risk of secondary pollution

Method used

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  • Passivation antagonism regulator for reducing Cd pollution of winter wheat and preparation method of passivation antagonism regulator
  • Passivation antagonism regulator for reducing Cd pollution of winter wheat and preparation method of passivation antagonism regulator
  • Passivation antagonism regulator for reducing Cd pollution of winter wheat and preparation method of passivation antagonism regulator

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preparation example Construction

[0028] Its preparation method comprises the following steps:

[0029] A Pass all raw materials through a 100-mesh sieve, add water and stir evenly, wherein the mass ratio of added water to raw materials is 1:1 to 3:1;

[0030] B transfers the homogeneously mixed raw materials to the reactor;

[0031] C react the reactor under the saturated vapor pressure of 160-230°C for 12-24h, and cool naturally;

[0032] D Take out the product in the reaction kettle, dry it, and pulverize it to get the finished product.

[0033] The regulating agent of the present invention can be used as base fertilizer for wheat fields before sowing. When used as base fertilizer, 150-180 kg per mu is suitable for moderately polluted soil, and 100-120 kg per mu for lightly polluted soil. In addition, the regulating agent of the present invention can also be used as top dressing during the period from turning green to jointing of wheat seedlings, preferably 30-50 kg per mu.

[0034] The regulator of the...

Embodiment 1

[0037] At pH=7.96, the soil total Cd and effective state content (DPTA extraction) are respectively 3.54mg / kg and 2.05 heavy cadmium exceeding the standard alkaline soil to plant Huaimai 22, and the regulating agent of the present invention (composed of preferred raw materials) is sprinkled with base fertilizer The test results are shown in Table 1:

[0038] Table 1 Product test results in heavily polluted soil

[0039]

[0040] The results showed that the average Cd content of wheat in heavily polluted soil decreased by 56.1% compared with the control under the treatment of this product, and the effect of reducing Cd was remarkable. At the same time, the soil available cadmium decreased by an average of 71.6%.

Embodiment 2

[0042] At pH=7.72, the soil full Cd and effective state (DPTA extraction) content are respectively 1.83mg / kg and 1.14 moderate cadmium exceeding the standard soil to plant Huaimai 22, and the regulating agent of the present invention (using preferred raw materials to form) is used as base fertilizer and topdressing Application, the test results are shown in Table 2:

[0043] Table 2 Product test results in moderately polluted soil

[0044]

[0045] The results showed that the Cd content of wheat in mildly polluted soil was reduced by 66.7% on average compared with the control under the treatment of this product, and the average Cd content of wheat reached the national food limit standard, and the effect of reducing Cd was remarkable.

[0046] From the above results, it can be seen that the new conditioner has a significant effect on Cd control in wheat fields with different pollution types.

[0047] The results of the above field experiments show that the conditioner can r...

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Abstract

The invention discloses a passivation antagonism regulator for reducing Cd pollution of winter wheat. The regulator is prepared from the following raw materials in parts by weight as follows: 6-12 parts of EDTA.Na2Mn, 15-30 parts of ZnSO4, 2-4 parts of MgSO4, 2-4 parts of FeSO4, 20-40 parts of CaCO3 and 100-150 parts of Mg5Si8O20(OH)2(OH2)4.4H2O. With adoption of the method, on the one hand, the occurrence form of Cd in soil is changed by improving soil adsorption and precipitation, and bioavailability of Cd in the soil is reduced; on the other hand, absorption of Cd in wheat is reduced through element antagonism, the two means are used at the same time, and accordingly, the restoration effect and efficiency are guaranteed.

Description

technical field [0001] The invention relates to the field of heavy metal pollution control, in particular to a passivation antagonist regulator for reducing cadmium pollution in winter wheat and a preparation method thereof. Background technique [0002] In recent years, with the development of industrial and mining enterprises, a large amount of heavy metal elements have been released into the environment and accumulated in farmland soil through atmospheric deposition, irrigation, etc., and farmland heavy metal pollution has become one of the main problems affecting my country's grain production and food safety. . Among them, the problem of soil pollution by heavy metal cadmium in farmland has attracted the attention of all countries in the world, and the problem of cadmium pollution in my country is particularly prominent. According to incomplete statistics, the area of ​​cultivated land polluted by heavy metals in my country is nearly 2.0×10 8 hm 2 , accounting for abou...

Claims

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Application Information

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IPC IPC(8): C09K17/40C09K101/00
CPCC09K17/40C09K2101/00
Inventor 陈卫平李艳玲焦文涛王美娥
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI