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Rice field soil cadmium-arsenic synchronous passivator and preparation method and application thereof

A passivation agent, soil technology, applied in chemical instruments and methods, applications, soil conditioning materials, etc., can solve the problems of not being able to maximize efficiency, nano-zero-valent iron and ferrous iron are easy to agglomerate, etc., to improve passivation efficiency, The effect of reducing cadmium and arsenic content and achieving standard production

Active Publication Date: 2018-11-09
中向旭曜科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, pure nanometer zero-valent iron and ferrous iron are easy to aggregate and be oxidized in the soil, and often no longer work within a short period of time after application, nor can they maximize their efficiency.

Method used

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  • Rice field soil cadmium-arsenic synchronous passivator and preparation method and application thereof
  • Rice field soil cadmium-arsenic synchronous passivator and preparation method and application thereof
  • Rice field soil cadmium-arsenic synchronous passivator and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] Embodiment 1: the preparation of the cadmium arsenic synchronous passivator with three-layer film structure

[0072] (1) Take by weighing 100g potassium nitrate, 100g ferric nitrate, 50g calcium peroxide, 50g urea peroxide, then add 5g corn flour (Wuhan Jiangmin Huatai Pharmaceutical Chemical Co., Ltd.), 5g sweet potato powder (Wuhan Jiangmin Huatai Pharmaceutical Chemical Co., Ltd. Company), 5g cassava flour (Hunan Xianglilai Chemical Co., Ltd.), and add 150mL deionized water, after mixing evenly, granulate and then dry naturally, and the particle diameter is controlled to be 3mm to prepare the core material of hydrogen ion consuming agent.

[0073] (2) The above-mentioned hydrogen ion consuming agent core material and coating material (chitosan pH is 9, mass fraction 0.3%) are coated on the core material according to the mass volume ratio of 1:0.5, and the coating thickness is controlled to be 0.8mm , to prepare the inner layer hydrogen ion consuming agent with membra...

Embodiment 2

[0078] Embodiment 2: the preparation of the cadmium arsenic synchronous passivator with three-layer film structure

[0079] (1) Weigh 500g of magnesium nitrate and 100g of zinc peroxide, then add 18g of potato powder (provided by Hunan Xianglilai Chemical Co., Ltd.), and add 360mL of deionized water, mix well, granulate and dry, and control the particle diameter to 3.5mm ; The core material of the hydrogen ion consuming agent is obtained.

[0080] (2) The above-mentioned hydrogen ion consuming agent core material and coating material (chitosan pH is 9, mass fraction 0.3%) are coated on the core material according to the mass volume ratio of 1:0.3, and the coating thickness is controlled to be 0.5mm , to prepare the inner layer hydrogen ion consuming agent with membrane structure.

[0081] (3) Mix the above-mentioned hydrogen ion consuming agent in the inner layer with membrane structure, 18kg of peat soil (Zhongxiang Xuyao ​​Technology Co., Ltd.), 460g of sweet potato flour, ...

Embodiment 3

[0085] Embodiment 3: the preparation of the cadmium arsenic synchronous passivator with three-layer film structure

[0086] (1) Take by weighing 150g sodium nitrate, 150g calcium nitrate, 50g calcium peroxide, 50g zinc peroxide, then add 16g corn flour, and add 220mL deionized water, mix evenly, granulate and dry, and control the particle diameter to 2.5mm, A hydrogen ion consuming agent core material is prepared.

[0087] (2) Coating the core material of the above-mentioned hydrogen ion consuming agent core material and coating material (chitosan pH is 9, 0.3% by mass) according to the mass volume ratio of 1:1.2, and the thickness of the coating is controlled to be 1mm, The inner layer hydrogen ion consuming agent with membrane structure is prepared.

[0088] (3) Mix the above-mentioned inner layer hydrogen ion consuming agent with membrane structure with 3.0kg of peat soil (Zhongxiang Xuyao ​​Technology Co., Ltd.), 100g of fulvic acid, 100g of brown humic acid, 140g of swee...

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Abstract

The invention discloses a rice field soil cadmium-arsenic synchronous passivator and a preparation method and application thereof. The passivator contains three layers structures from inside to outside, and each layer is provided with an independent coating film; the innermost layer is a hydrogen ion chemical consumption agent, the middle layer is a reaction accelerator humus substance, and the outermost layer is a mineralization precursor; the hydrogen ion chemical consumption agent is nitrate and peroxide; the reaction accelerator humus substance is more than one or more than two of peat soil, humic acid, fulvic acid, humin, yellow humic acid, nitrohumic humic acid and black humic acid; and the mineralization precursor is reducing iron powder, ferrous salt and / or solid ferrous ore. According to the cadmium-arsenic synchronous passivator with the three-layer film structure, effective components can be slowly released into the soil, the effect can be fully played, so that violent reaction or agglomeration of the components is avoided, the passivation efficiency is improved, the content of cadmium and arsenic in the heavy metal of the rice can be effectively reduced, and the standard production of the rice field in the medium and light pollution can be realized.

Description

technical field [0001] The invention belongs to the field of environmental protection, and in particular relates to a paddy field soil cadmium and arsenic synchronous passivator as well as its preparation method and application. Background technique [0002] Both arsenic and cadmium are highly toxic elements. Excessive arsenic and cadmium will have adverse effects on the growth of animals and plants and even human health. In recent years, the risk of rice arsenic and cadmium compound pollution to human health has been widely concerned. In 2014, the Ministry of Environmental Protection and the Ministry of Land and Resources issued the "National Soil Pollution Survey Bulletin", which showed that the national soil cadmium and arsenic exceeded the standard rate of 7.0% and 2.7%, respectively, with slight and light pollution. The pollution of cadmium and arsenic in paddy fields is more prominent than that in dry land. This is because arsenic is easily reduced to trivalent arseni...

Claims

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Application Information

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IPC IPC(8): B09C1/08C09K17/40C09K109/00C09K101/00
CPCB09C1/08C09K17/40C09K2101/00C09K2109/00
Inventor 李芳柏刘传平
Owner 中向旭曜科技有限公司
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