A kind of basic magnesium carbonate composite material loaded on the surface of diatomite and its fixing method to soil lead
A surface-loaded, composite material technology, used in soil conditioning materials, restoration of polluted soil, material excitation analysis, etc., can solve the problems of small porosity, small adsorption capacity, low specific surface area, etc., and achieve low cost and good effect. , the effect of simple operation
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Embodiment 1
[0026] (1) Weigh 1.00 kg of the original soil sample through a 10-mesh sieve into a plastic bucket, add lead nitrate in the form of a solution, and prepare an exogenous lead concentration of 500 mg kg -1 Contaminated soil, after stirring evenly, let it stand for 90 days, pay attention to add water during the stabilization process.
[0027] (2) Accurately weigh several copies of exogenous lead that have been aged in the early stage and the concentration is 500mg kg -1 Put 5.00g of the soil sample into a 50mL centrifuge tube, add two passivating agents with a mass ratio of 1%, respectively, set up three parallels for each group, mix them evenly, and let them stand and age for 30d.
[0028](3) After the aging of the passivated soil under the above conditions, the distribution of various forms of lead in the soil was measured by BCR continuous extraction experiments, and then the lead concentration was measured by ICP.
Embodiment 2
[0030] (1) Weigh 1.00 kg of the original soil sample through a 10-mesh sieve into a plastic bucket, add lead nitrate in the form of a solution, and prepare an exogenous lead concentration of 500 mg kg -1 Contaminated soil, after stirring evenly, let it stand for 90 days, pay attention to add water during the stabilization process.
[0031] (2) Accurately weigh several copies of exogenous lead that have been aged in the early stage and the concentration is 500mg kg -1 Put 5.00g of the soil sample into a 50mL centrifuge tube, add two passivating agents with a mass ratio of 5% respectively, set up three parallels for each group, mix them evenly, and let them stand and age for 30 days.
[0032] (3) After the aging of the passivated soil under the above conditions, the distribution of various forms of lead in the soil was measured by BCR continuous extraction experiments, and then the lead concentration was measured by ICP.
Embodiment 3
[0034] (1) Weigh 1.00 kg of the original soil sample through a 10-mesh sieve into a plastic bucket, add lead nitrate in the form of a solution, and prepare an exogenous lead concentration of 500 mg kg -1 Contaminated soil, after stirring evenly, let it stand for 90 days, pay attention to add water during the stabilization process.
[0035] (2) Accurately weigh several copies of exogenous lead that have been aged in the early stage and the concentration is 500mg kg -1 Put 5.00g of the soil sample into a 50mL centrifuge tube, add two passivating agents with a mass ratio of 10% respectively, set up three parallels for each group, mix them evenly, and let them stand and age for 30 days.
[0036] (3) After the aging of the passivated soil under the above conditions, the distribution of various forms of lead in the soil was measured by BCR continuous extraction experiments, and then the lead concentration was measured by ICP.
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