Passivating agent and application thereof in repairing medium-light mercury polluted farmland soil
A passivating agent and mercury-polluted technology, which is applied in the restoration of polluted soil, application, soil conditioning materials, etc., can solve problems such as difficulty in ensuring the fixation effect, and achieve the effect of lower cost, safety assurance, and simple operation
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Embodiment 1
[0017] Example 1: Effect of Passivator Application on Mercury Accumulation in Rice Grain on Moderately and Low Mercury Contaminated Soil
[0018] Definition of medium and low-level pollution: between 1 and 3 times of my country's Secondary Standard for Soil Environmental Quality (GB 15618-1995) (inclusive), it is mildly polluted; between 3 and 5 times (inclusive), It is moderately polluted.
[0019] 1.1 Experimental design
[0020] The field experiment was carried out on farmland soil with medium and low levels of mercury pollution. The soil was collected from the 0-20cm topsoil of an agricultural land in southern Jiangsu. All the raw materials of the modified materials were purchased from commercial products (the zeolite had passed through a 100-mesh sieve). The crops grown are rice.
[0021] The pH of farmland soil is 6.00, which is acidic. The main pollutant of heavy metals is mercury, with an average concentration of 1.80mg / kg. (0.5mg / kg), and 3.6 times the screening va...
Embodiment 2
[0028]Example 2: Effect of Passivator Application on Mercury Accumulation in Wheat Grain on Moderately and Low Mercury Contaminated Soil
[0029] 2.1 Experimental design
[0030] The field experiment was carried out on farmland soil with medium and low levels of mercury pollution. The soil was collected from the 0-20cm topsoil of an agricultural land in southern Jiangsu. All the raw materials of the modified materials were purchased from commercial products (the zeolite had passed through a 100-mesh sieve). The crops grown are wheat.
[0031] The pH of farmland soil is 6.00, which is acidic. The main pollutant of heavy metals is mercury, with an average concentration of 1.80mg / kg. (0.5mg / kg), and 3.6 times the screening value. The test was repeated 4 times, and one or more passivating agents were added to the soil at a mass ratio (W / W) of 0.33%-0.67% of the total application amount, wherein M was treated with zeolite, and D was treated with zeolite. Sodium selenate is proc...
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