Soil passivation improver, and preparation method and application thereof
A technology of soil passivation and improver, which is applied in the direction of chemical instruments and methods, applications, soil conditioning materials, etc., can solve the problems of difficult cultivation, heavy metal anti-dissolution repair time, large amount of curing agent, etc., to reduce absorption, Good passivation effect, effect of reducing bioavailability
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Embodiment 1~5
[0026] In embodiment 1~5:
[0027] According to "Atomic Absorption Method for the Determination of Effective State Lead and Cadmium in Soil Quality" (GB / T 23739-2009), the content of DTPA effective heavy metal in soil was determined;
[0028] According to "Determination of Ammonium Nitrogen, Available Phosphorus, and Available Potassium in Acidic Soil Combined with Extraction-Colorimetric Method" (NY / T1849-2010), the content of soil available Phosphorus and available Potassium was determined;
[0029] The content of soil organic matter was determined according to "Methods for Determination of Soil Organic Matter" (GB 9834-1988).
Embodiment 1
[0031] 1. Weigh 50% bentonite, 35% diatomaceous earth, 10% magnesium oxide, 4.9% iron oxide, 0.1% humic acid, spray 2% of the water into the material, and add it to a ball mill for full grinding 4 Hours, get the soil passivation improver.
[0032] 2. Add the compounded soil passivation improver at 1200kg / mu to the contaminated farmland containing Cd and Pb, fully plow and stir, and the equilibrium time is 20 days.
[0033] After 20 days, the samples were air-dried naturally. After testing, the effective concentration of Cd in the soil is 0.125mg / kg, and the effective concentration of Pb is 126mg / kg. After applying the passivation modifier, they are 0.085mg / kg and 71.6mg / kg respectively, which are lower than before the application. 32.0% and 43.2%; the organic matter content in the soil increased from 16.3% to 16.5%, the concentration of available phosphorus was 64.1mg / kg, and the concentration of available potassium was 170mg / kg. After applying the passivation modifier, they ...
Embodiment 2
[0035] 1. Weigh 70% bentonite, 20% diatomaceous earth, 5% magnesium oxide, 4.9% iron oxide, 0.1% humic acid, spray 3% of the water into the material, and add it to a ball mill for full grinding 3 Hours, get the soil passivation improver.
[0036] 2. Add the compounded soil passivation improver at 1000kg / mu to the farmland containing Cd or Pb pollution, fully plow and stir, and the equilibrium time is 30 days.
[0037]After 30 days, the samples were taken and air-dried naturally. After testing, the effective concentration of Cd was 0.126mg / kg, and the effective concentration of Pb was 126mg / kg. The former decreased by 40.0% and 45.8%, the organic matter content in the soil increased from 16.3% to 16.5%, the available phosphorus concentration was 64.1mg / kg and the available potassium concentration was 170mg / kg. kg and 181mg / kg, an increase of 5.5% and 6.5%, respectively.
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