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Paddy rice soil heavy metal cadmium sustained-release passivating agent and use method thereof

A heavy metal and passivating agent technology, applied in chemical instruments and methods, soil preparation methods, soil conditioning materials, etc., can solve the problems of accelerating the reduction process of soil sulfur and iron, difficult to stabilize the use effect, and strong influence of soil conditions, etc., to achieve enhanced Soil fertilizer efficiency, increase passivation efficiency, reduce bioavailability effect

Inactive Publication Date: 2018-01-26
四川长虹格润环保科技股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Another example is that Chinese patent document CN105713617A discloses a heavy metal cadmium passivator that activates the activity of rice field soil sulfur-reducing bacteria. The reduction process promotes the fixation of cadmium, which belongs to the indirect chemical precipitation method, but this method is strongly affected by the soil conditions, and the significance of its effect is affected
[0005] Generally speaking, most of the existing similar inventions use one or two of the three methods of adsorption, complexation, and precipitation. Although they can quickly produce effects after application, they are strongly affected by soil conditions and the use effects are difficult to stabilize.

Method used

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  • Paddy rice soil heavy metal cadmium sustained-release passivating agent and use method thereof
  • Paddy rice soil heavy metal cadmium sustained-release passivating agent and use method thereof
  • Paddy rice soil heavy metal cadmium sustained-release passivating agent and use method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] After detection and analysis, the average soil pH value of the test field is 6.30, and 60kg / mu of quicklime and 70kg / mu of organic fertilizer are applied to the soil, and the soil pH is adjusted to 7.12. Then apply 480kg / mu of humic acid, 1.5kg / mu of potassium thiosulfate, and 240kg / mu of bentonite. After 2 days of action, harrow the field and transplant rice. The results of grain and soil testing and blank control after rice harvest are shown in Table 1:

[0046] Table 1 Soil available cadmium and rice cadmium content

[0047]

[0048] As can be seen from Table 1, the effective cadmium content in the polluted soil after the rice soil heavy metal cadmium slow-release passivator treatment of the present invention is reduced by 35.9% compared with the blank treatment, and the detection result of the cadmium content in planted rice meets GB2762-2012 "National Food Safety Standard" - Limits of pollutants in food" standard requirements (<0.2mg / kg), to meet the requirement...

Embodiment 2

[0050] After detection and analysis, the average soil pH value of the test field is 6.30, and 65kg / mu of quicklime and 78kg / mu of organic fertilizer are applied to the soil, and the soil pH is adjusted to 7.28. Then add humic acid 552.5kg / mu, potassium thiosulfate 1.65kg / mu, and bentonite 260kg / mu. After 2 days of action, harrow the field and transplant rice. The results of grain and soil testing and blank control after rice harvest are shown in Table 2 :

[0051] Table 2 Soil available cadmium and rice cadmium content

[0052]

[0053] As can be seen from Table 2, the effective cadmium content in the polluted soil after the rice soil heavy metal cadmium slow-release passivator treatment of the present invention is reduced by 39.6% compared with the blank treatment, and the detection result of the cadmium content in planted rice meets GB2762-2012 "National Food Safety Standard" - Limits of pollutants in food" standard requirements (<0.2mg / kg), to meet the requirements of s...

Embodiment 3

[0055] After testing and analysis, the average soil pH of the test field is 6.30. Apply 72kg / mu of quicklime and 90kg / mu of organic fertilizer to the polluted soil, adjust the soil pH to 7.45, and use a rotary tiller to mix it evenly. After 7 days, 570kg / mu of humic acid, 1.8kg / mu of potassium thiosulfate, and 300kg / mu of bentonite were applied. After 2 days of action, the fields were harrowed and rice transplanted. As in Table 3:

[0056] Table 3 Soil available cadmium and rice cadmium content

[0057]

[0058] As can be seen from Table 3, the effective cadmium content in the polluted soil after the rice soil heavy metal cadmium slow-release passivator treatment of the present invention is reduced by 43.3% compared with the blank treatment, and the cadmium content detection result of the planted rice meets GB2762-2012 "National Food Safety Standard" - Limits of pollutants in food" standard requirements (<0.2mg / kg), to meet the requirements of safe production.

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Abstract

The invention discloses a paddy rice soil heavy metal cadmium sustained-release passivating agent and a use method thereof, and belongs to the field of soil heavy metal pollution control. The paddy rice soil heavy metal cadmium sustained-release passivating agent comprises the following components in parts by mass: 10-15 parts of quick lime, 8-20 parts of an organic fertilizer, 80-125 parts of humic acid, 0.25-0.5 part of potassium thiosulfate, and 40-60 parts of bentonite. The use method comprises the steps: applying calcium oxide and the organic fertilizer to acid contaminated soil, adjusting the pH of the soil to 7.0-8.0, acting for 7-10 days, then adding humic acid, potassium thiosulfate and bentonite to the soil, and acting for 1-2 days, wherein crops can be planted on the obtained soil. The heavy metal cadmium sustained-release passivating agent has high passivation efficiency, has durable and stable sustained-release and passivation effects, and has the function of improving andenhancing soil fertilizer efficiency, and cannot cause secondary pollution; the used materials are low in cost, safe and reliable, and the paddy rice soil heavy metal cadmium sustained-release passivating agent has good social and environmental benefits.

Description

technical field [0001] The invention belongs to the field of soil heavy metal pollution control, and in particular relates to a paddy soil heavy metal cadmium slow-release passivator and a use method thereof. Background technique [0002] In recent years, affected by industrial and agricultural activities such as mining, atmospheric pollutant deposition, sewage irrigation, sludge fertilization, and excessive application of pesticides and fertilizers, coupled with high background values ​​of heavy metals in soils in some areas, some farmland soils in my country have different degrees of cadmium pollution risks. . The accumulation of harmful heavy metals in the soil to a certain extent will not only lead to soil degradation, crop yield and quality decline, but also may directly poison plants or endanger human health through the food chain. The quality of farmland soil is related to the safety of agricultural products and the health of the people. It is not only an environmenta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40C05G3/04A01B79/02C09K101/00C05G3/80
Inventor 杨毅宇罗宏基符志强谢佳旭袁辉钟华萍李霞何益范钦豪
Owner 四川长虹格润环保科技股份有限公司
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