Method for lowering heavy-metal lead-cadmium content of Ipomoea aquatica

A technology of heavy metals and water spinach, applied in the direction of fertilization methods, botanical equipment and methods, restoration of polluted soil, etc., to achieve the effects of low treatment costs, improved vegetable yield and quality, and easy production and implementation

Inactive Publication Date: 2017-04-26
PUBLIC MONITORING CENT FOR AGRO PROD OF GUANGDONG ACADEMY OF AGRI SCI
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  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the existing problems in the control of lead and cadmium pollution in water spinach, and provide a method for reducing the content of heavy metal lead and cadmium in water spinach, so as to reduce the risk of water spinach pollution in heavy metal lead and cadmium polluted soil

Method used

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  • Method for lowering heavy-metal lead-cadmium content of Ipomoea aquatica
  • Method for lowering heavy-metal lead-cadmium content of Ipomoea aquatica
  • Method for lowering heavy-metal lead-cadmium content of Ipomoea aquatica

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Embodiment 1

[0018] Embodiment 1: Biochar reduces the potted plant of water spinach lead and cadmium content

[0019] An improvement agent for reducing the risk of water spinach pollution in soil polluted by heavy metal lead and cadmium, prepared by the following process: after cutting the dried rice stalks into 15 cm small sections, put them in a vacuum box-type atmosphere furnace, and feed N 2 As a protective gas, the temperature was raised to 600°C at a rate of 10°C / min, and then carbonized at a constant temperature for 2 hours. After cooling to room temperature, the grinding particle size was biochar particles that passed through a 20-mesh sieve.

[0020] Soil lead and cadmium pollution levels are set at 400 mg·kg -1 and 5.0mg·kg -1 . Apply 6 grams of biochar particles per kilogram of soil to the entire base, and then turn it evenly to mix the biochar and the contaminated soil evenly. After 20 days of watering and balancing, it can be sown or transplanted. Two commercially available...

Embodiment 2

[0022] Embodiment 2: lime reduces the potted plant of water spinach lead and cadmium content

[0023] Lime is selected as analytically pure calcium hydroxide, in which Ca(OH) 2 Content ≥ 95.0%, hydrochloric acid insoluble matter ≤ 0.05%, chloride (Cl) ≤ 0.01%, sulfate (as SO 4 ≤ 0.2%, iron ≤ 0.01%, heavy metal (calculated as Pb) ≤ 0.002%, magnesium salt and alkali metal (MgO) ≤ 0.5%, precipitate in ammonium hydroxide ≤ 0.25%.

[0024] Soil lead and cadmium pollution levels are set at 400 mg·kg -1 and 5.0mg·kg -1 . Apply 6 grams of lime per kilogram of soil for the entire base application, and then turn it evenly to mix the lime and contaminated soil evenly. After 20 days of watering and balancing, it can be sown or transplanted. Two commercially available water spinach varieties, green stems and big-leaf spinach and Thai willow-leaf spinach, were selected. Select 30 healthy and uniform seeds from each water spinach variety to be tested and sow them into pots. When the see...

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Abstract

The invention discloses a method for lowering heavy-metal lead-cadmium content of Ipomoea aquatica. The method is characterized by comprising the steps: applying 5g to 8g of lime or bio-carbon granules to soil per kilogram in a full basal application manner, then, carrying out uniform turning so as to uniformly mix the lime or bio-carbon granules with contaminated soil, carrying out water drenching, carrying out balancing for 20 days, and then, carrying out sowing or transplanting, wherein a water layer of 1cm to 2cm is always kept on a soil surface during the growth of the Ipomoea aquatica. According to the method, under the condition of Ipomoea aquatica water-cultivation, the actions of lowering the heavy-metal lead-cadmium content of vegetables and improving the yield and quality of the vegetables can be better achieved compared with dry cultivation, so that the method can be extensively applied to the remediation of soil of lead-cadmium medium- / light-polluted or heavy-polluted acidic vegetable plots.

Description

technical field [0001] The invention relates to vegetable safe planting technology and soil improvement technology, in particular to a method for reducing heavy metal lead and cadmium content in water spinach, so as to reduce the pollution risk of water spinach in soil polluted by heavy metal lead and cadmium. Background technique [0002] Lead (Pb) and cadmium (Cd) are toxic heavy metals that have attracted much attention in the environment, and the pollution of farmland soil and excessive heavy metals in vegetables caused by them are particularly prominent. Because Cd has a relatively high effective state ratio in the soil and has strong activity, it is easily absorbed by crops and pollutes the food chain, endangering human health; and Pb is the most rapid in pollution due to its wide range of uses. Vegetables are the most widely consumed agricultural products, so it is particularly important to reduce the risk of heavy metal pollution and ensure the quality and safety of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01G1/00A01C21/00B09C1/08
CPCA01C21/005A01G22/00B09C1/08
Inventor 李富荣王富华杜应琼李敏
Owner PUBLIC MONITORING CENT FOR AGRO PROD OF GUANGDONG ACADEMY OF AGRI SCI
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