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Modifier for reducing methyl mercury pollution in acidic rice field and method thereof

A technology of methylmercury and modifier, applied in the restoration of polluted soil, chemical instruments and methods, organic fertilizers, etc., can solve the problem of impossible to know the actual content of sulfate, difficult to meet the needs of pollution control, organic carbon production procedures Complicated problems, to achieve the effect of not reducing rice yield and plant biomass, reducing methylmercury content in rice, and improving soil pH and mercury adsorption capacity

Inactive Publication Date: 2017-03-22
农业部农业生态与资源保护总站
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Second, it is more complicated in use and dosage, difficult to master in practice, and poor in feasibility
In practice, it is difficult for farmers to calculate the input amount of selenium salt based on the ratio of 2-3mg / kg, and it is impossible to know the actual content of sulfate in the soil
The third is that the influence of continuous flooding during the rice planting period on the transformation of methylmercury in the rice field proposed in the publication still needs further research
The publicly used organic carbon production process is complicated, it is difficult to achieve large-scale production, and it is difficult to meet the needs of large-scale and wide-ranging field mercury pollution control

Method used

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  • Modifier for reducing methyl mercury pollution in acidic rice field and method thereof
  • Modifier for reducing methyl mercury pollution in acidic rice field and method thereof
  • Modifier for reducing methyl mercury pollution in acidic rice field and method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Embodiment 1: the improver that reduces acid rice field methylmercury pollution

[0045] The weathered coal was taken from an open-pit coal mine in Huozhou, Shanxi, with a humic acid content of 623g / kg and a Hg content of 0.012mg / kg.

[0046] Prepared by the following steps:

[0047] Remove sundries from the weathered coal, grind it and pass it through a 1mm sieve. According to the water-to-coal ratio (mass ratio) of 10:1, add clean water to the weathered coal powder, stir evenly, and in the treatment pool of an ultrasonic cleaning machine (KQ-500DE, Kunshan Ultrasonic Instrument Co., Ltd.), according to the ultrasonic power of 500W and ultrasonic time of 40 minutes for ultrasonic activation. After the activation is completed, air-dry the weathered pulverized coal at room temperature. Add 0.1mol / L HCl according to the volume ratio of 1:2, soak for 72 hours, fully stir or shake during soaking. The soaked material was filtered with a bamboo drying mat, rinsed with wat...

Embodiment 2

[0049] Embodiment 2: the improver that reduces acid rice field methylmercury pollution

[0050] The weathered coal was taken from the Guozhuang Coal Mine in Tengzhou, Shandong, with a humic acid content of 743g / kg and a Hg content of 0.016mg / kg.

[0051] Prepared by the following steps:

[0052] Remove sundries from the weathered coal, grind it and pass it through a 0.8mm sieve. According to the water-to-coal ratio (mass ratio) of 12:1, add clean water to the weathered coal powder, stir evenly, and in the treatment pool of an ultrasonic cleaning machine (KQ-500DE, Kunshan Ultrasonic Instrument Co., Ltd.), according to the ultrasonic power of 650W and ultrasonic time of 35 minutes for ultrasonic activation. After the activation is completed, air-dry the weathered pulverized coal at room temperature. Add 0.1mol / L HCl according to the volume ratio of 1:3, soak for 78 hours, fully stir or shake during soaking. The soaked material was filtered with a bamboo drying mat, rinsed r...

Embodiment 3

[0054] Embodiment 3: the improver that reduces acid rice field methylmercury pollution

[0055] The weathered coal was taken from Jinan Lifu Coal Mine, with a humic acid content of 574g / kg and a Hg content of 0.019mg / kg.

[0056] Prepared by the following steps:

[0057] Remove sundries from the weathered coal, grind it and pass it through a 1.5mm sieve. According to the water-to-coal ratio (mass ratio) of 9:1, add clean water to the weathered coal powder, stir evenly, and in the treatment pool of an ultrasonic cleaning machine (KQ-500DE, Kunshan Ultrasonic Instrument Co., Ltd.), according to the ultrasonic power of 450W and ultrasonic time of 50 minutes for ultrasonic activation. After the activation is completed, air-dry the weathered pulverized coal at room temperature. Add 0.1mol / L HCl according to the volume ratio of 1:1.5, soak for 70 hours, fully stir or shake during soaking. The soaked material was filtered with a bamboo drying mat, rinsed with water for 4 times re...

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Abstract

The invention discloses a modifier for reducing methyl mercury pollution in an acidic rice field and a method thereof, which mainly relates to the field of agriculture pollution prevention and treatment. The method comprises basal application of the modifier and moisture management. The preparation method of the modifier is characterized in that weathered coal is prepared to coal-based humic acid, according to the weight percentage, 0.1-0.2% of sodium selenite is added and aged, calcium carbonate with the weight ratio of 1:1.2-1:1.5 is added, and the materials are uniformly mixed. The modifier has the beneficial effect that the modifier is used for the acidic rice field with pH value of 4-6 and the mercury pollution degree of lower than 6 mg / kg, compared with the contrast group, the methyl mercury content of soil and rice is reduce to 60% and more, the pH value of the soil is obviously increased, the modifier has good reappearance, and has the advantages of low cost, high efficiency and easy operation, the paddy rice output and plant biomass are not reduced, and the modifier has high economic effect.

Description

technical field [0001] The invention relates to the field of agricultural pollution prevention and control, in particular to an improver and a method for reducing methylmercury pollution in acid paddy fields. Background technique [0002] Mercury (Hg) and its compounds, especially methylmercury (MeHg), have strong biological toxicity, fast bioaccumulation magnification and long biological half-life of brain organs, even in small concentrations in soil and water environments , can also be amplified by bioconcentration through the food chain to reach extremely dangerous concentrations. The situation of soil mercury pollution in my country, especially in cultivated land, is not optimistic. According to the Bulletin of the First National Soil Pollution Survey published on April 7, 2014, the rate of Hg points exceeding the standard reached 1.6%. According to the second national census report of the Ministry of Agriculture, about 140×10 4 km 2 In the sewage irrigation area, th...

Claims

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Application Information

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IPC IPC(8): C09K17/40B09C1/08C09K101/00C09K109/00
CPCC09K17/40B09C1/08B09C2101/00C09K2101/00C09K2109/00
Inventor 郑顺安李晓华周玮薛颖昊段青红黄宏坤
Owner 农业部农业生态与资源保护总站
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