Method for decreasing methyl mercury content in rice

A methylmercury, content technology, applied in rice cultivation, botany equipment and methods, horticulture, etc., can solve problems such as difficulty in grasping the application dosage and complicated fertilization process

Inactive Publication Date: 2015-11-18
NANJING UNIV +1
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Problems solved by technology

However, the currently existing method of reducing mercury content in rice through fertilization has the disadvantages that the fertilization process is relatively complicated and the application dosage is difficult to control

Method used

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  • Method for decreasing methyl mercury content in rice
  • Method for decreasing methyl mercury content in rice
  • Method for decreasing methyl mercury content in rice

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Embodiment Construction

[0011] In a basic embodiment, there is provided a method for reducing rice methylmercury content, said method comprising the steps of:

[0012] Step S100: applying inorganic selenium salts, or a mixture of inorganic selenium salts and sulfates, to the soil;

[0013] Step S200: On the Wth day after step S100, the rice is planted in a flooded manner, and the range of W is greater than or equal to 20 days;

[0014] in:

[0015] The inorganic selenium salt is calculated as total selenium in soil, and its content is 2-3 mg / kg;

[0016] The sulfate content is 2 times of the sulfate content in the soil.

[0017] In this embodiment, the method is to reduce the content of methylmercury in rice by applying inorganic selenium salt, or a mixture of inorganic selenium salt and sulfate, to the soil at least 20 days before rice planting under the condition of flooded rice cultivation. . The method mainly uses inorganic selenate or selenite to convert into low-valence selenium under flood...

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Abstract

The invention relates to a method for decreasing methyl mercury content in rice. The method comprises the steps that on the condition of planting rice in a flooded mode, inorganic selenium salt or a mixture of inorganic selenium and sulfate is applied to soil at least 20 days before the rice is planted to decrease the methyl mercury content in rice, wherein in terms of total selenium, the content of the inorganic selenium salt in per kg of soil is 2-3 mg, and the content of the sulfate is 2 times that of the sulfate in soil. According to the method, on the condition that the rice is planted in the flooded mode, inorganic selenium and inorganic mercury are mainly utilized for forming inert mercury on the anaerobic condition to decrease the methyl mercury content in soil; meanwhile, sulfate reduction causes sulfide generation, the bio availability of methyl mercury in soil can be decreased to a certain degree, and then the methyl mercury content in rice is decreased. In order to avoid potential soil selenium pollution risk caused by high selenium using amount, the total selenium applying amount is not larger than 2-3 mg / kg in the method.

Description

technical field [0001] The disclosure relates to the field of environmental protection, in particular to a method for reducing methylmercury content in rice. Background technique [0002] Mercury is a highly toxic and persistent heavy metal pollutant, which is listed as one of the primary control pollutants by governments. Inorganic mercury in nature can be converted into methylmercury under certain conditions. Methylmercury is more toxic and can be enriched and enlarged along the food chain, which seriously threatens the safety of the ecological environment and human health. my country is considered to be the world's largest producer, consumer and emitter of mercury, which has caused some mercury pollution problems. The 2014 National Soil Pollution Survey Bulletin shows that the excess rate of soil mercury pollution in my country is 1.6%, especially the problem of soil mercury pollution in industrial and mining wasteland is prominent. According to a market survey, about ...

Claims

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Application Information

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IPC IPC(8): A01G16/00A01G22/22
CPCA01G22/22
Inventor 钟寰王永杰党菲
Owner NANJING UNIV
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