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Method for reducing mercury content in rice

A technology of rice and water content, applied in rice cultivation, fertilization methods, gardening methods, etc., can solve the problems of ineffective block absorption and translocation, absorption, and low availability of heavy metals such as mercury, so as to reduce bioavailability Mercury content, low cost, and growth-enhancing effects

Inactive Publication Date: 2014-02-05
INST OF HIGH ENERGY PHYSICS CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage is that, compared with root fertilization, foliar application of selenium fertilizer has a lower absorption and availability rate, and foliar fertilization cannot effectively block the absorption and transport of heavy metals such as mercury by rice roots.

Method used

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  • Method for reducing mercury content in rice
  • Method for reducing mercury content in rice

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Embodiment 1 Apply selenium-containing aqueous solution to reduce the content of total mercury and methylmercury in each tissue of rice

[0027] The inventor used the bonding blocker (selenium-containing aqueous solution) of the present invention to carry out the experiment of supplementing selenium in the soil of the mercury-contaminated paddy field in Guizhou to plant rice in sub-plots. The specific test process is as follows:

[0028] 1. Application of Bonding Blocker

[0029] 1) Use the pre-prepared 0.5mg / L sodium selenite aqueous solution as the bonding blocker, and selenium salts such as sodium selenate and nano-selenium can also be selected, and according to the concentration level of selenium in mercury-contaminated paddy field soil Preparation (investigation and research found that the selenium content of some mercury-contaminated paddy fields in the experimental area was as low as 0.024mg / kg). The selenium-containing solution was applied to the mercury-contam...

Embodiment 2

[0040] Embodiment 2 Bonding blocker (respectively selected from sulfur salt, iodine salt, EDTA and other ammonium salt aqueous solution) to the reducing effect of mercury in rice

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Abstract

The invention discloses a method for reducing mercury content in rice. By means of a bonding retardant technology, bio-availability mercury content in a growth medium can be reduced from the early growth stage of the rice, nutrient materials such as selenium, sulphur, iodine or ammonium can be supplemented in a rice field exposed to mercury for a long time, absorption of mercury of rice roots is fully reduced, transfer of mercury from the rice roots to aboveground parts is retarded, and content of total mercury and methyl mercury in the rice is reduced. The method is convenient to implement, low in cost and capable of reducing the content of inorganic mercury and methyl mercury in tissues of the rice in mercury polluted areas effectively. In addition, by means of supplementation of an appropriate amount of selenium in the rice field exposed to the mercury for a long time, the bio-availability mercury content in soil can be reduced, and effective selenium content in the soil is greatly increased so as to be favorable for crop growth and improving agricultural product quality. The method has important practical significance for food safety and human health of people in the areas exposed to the mercury for a long time and peripheral areas.

Description

technical field [0001] The invention belongs to the technical field of rice planting, and relates to a method for reducing the mercury content in long-term mercury-exposed farmland rice. Background technique [0002] Mercury is an environmentally toxic substance that seriously endangers human health. As one of the most important food crops in the world, rice is an important way for the human body to absorb heavy metals such as mercury. The long-term mercury mining and metal smelting in Wanshan, Guizhou and other areas have caused serious mercury pollution in the area. As the main food crop in the area, the mercury content in rice far exceeds the national food hygiene limit standard. The total mercury in brown rice can be Reach 569μgkg -1 , the content of methylmercury can reach 145μgkg -1 , has caused serious potential harm to human health. In addition to mercury mining, other non-ferrous metals such as lead and zinc smelting, coal burning, thermometers, and fluorescent ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01G16/00A01G7/00A01C21/00A01G22/22
Inventor 李玉锋李柏赵甲亭高愈希陈春英
Owner INST OF HIGH ENERGY PHYSICS CHINESE ACADEMY OF SCI
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