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Application of monocalcium phosphate as repairing material in reduction of bioavailability of Cd in alkalescent soil

A calcium dihydrogen phosphate, bioavailability technology, applied in the restoration, application, fertilizer mixture and other directions of polluted soil, which can solve the problems of strong soil alkalinity, reducing the availability of heavy metals, and increasing soil pH value.

Pending Publication Date: 2021-06-08
INST OF SOIL SCI CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the passivation restoration technology for acidic soil is relatively mature. The passivation materials used to repair heavy metals in acidic soil are mainly to increase the soil pH value. By increasing the soil pH value, the activity of heavy metals is reduced, thereby reducing the bioavailability of heavy metals.
For weakly alkaline soils (pH 7.1 to 7.5), the background pH of the soil is relatively high, and continuing to increase the pH of the soil will cause the soil to be too alkaline, increasing the risk of soil compaction and soil salinization. And it is difficult to significantly reduce the availability of heavy metals
There are few long-term effective passivation / stabilization methods for Cd-contaminated weakly alkaline soils

Method used

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  • Application of monocalcium phosphate as repairing material in reduction of bioavailability of Cd in alkalescent soil
  • Application of monocalcium phosphate as repairing material in reduction of bioavailability of Cd in alkalescent soil
  • Application of monocalcium phosphate as repairing material in reduction of bioavailability of Cd in alkalescent soil

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The soil for the test was collected from the sand ginger black soil in the range of 0-20cm from the farmland surface of Quanwangtou Village, Jiawang District, Xuzhou City, Jiangsu Province. The soil Cd content reached 1.12mg / kg. The basic physical and chemical properties are shown in Table 1. It is weakly alkaline soil. According to the "Soil Environmental Quality Agricultural Land Soil Pollution Risk Control Standard" (GB 15618-2018), the soil Cd content is between the farmland soil Cd risk screening value and the control value, which belongs to the mild pollution of soil Cd, and more than 80% of the domestic Cd pollution of cultivated land falls within this range.

[0033] Table 1 Example 1 Basic physical and chemical properties of the tested soil

[0034]

[0035]

[0036] In Table 1, the cation exchange capacity (CEC) is 8.21mol L -1 Sodium acetate-flame photometry; soil available phosphorus using 0.03mol / LNH 4 F-0.02mol / L HCl extraction method; available pota...

Embodiment 2

[0039] Calcium dihydrogen phosphate application rate accounts for 0.4% of soil quality dry weight, all the other are the same as embodiment 1.

[0040] The effect after embodiment 1 and embodiment 2 calcium dihydrogen phosphate is applied to slightly alkaline soil is detected and analyzed:

[0041] (1) The effect of applying calcium dihydrogen phosphate on the pH value of weakly alkaline soil

[0042] Soil pH is directly read on the pH meter by potentiometric method (water-to-soil ratio 2.5:1), and the test results are shown in Table 2:

[0043] Effect of table 2 Examples 1 to 2 on weakly alkaline soil pH after applying calcium dihydrogen phosphate

[0044]

[0045] As can be seen from Table 2, after embodiment 1 and embodiment 2 applied calcium dihydrogen phosphate for 30 days, there was no significant difference with the soil pH of blank control, but after 90 days, the soil pH of embodiment 1 and embodiment 2 treatment groups were all Reduce, the soil pH value of the tr...

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Abstract

The invention provides application of monocalcium phosphate as a repairing material in reducing the bioavailability of Cd in alkalescent soil, and relates to the technical field of soil heavy metal pollution prevention and control. The monocalcium phosphate is applied to alkalescent soil, so that the soil alkalinity can be prevented from being too strong; and the monocalcium phosphate can convert water-soluble Cd and acetate extraction Cd in the alkalescent soil into an oxidizable state and a residue state, phosphate radicals contained in the monocalcium phosphate and Cd < 2 + > in the alkalescent soil can also generate a co-precipitation effect, and the activity of Cd is reduced through an amorphous lattice immobilization effect. Therefore, the monocalcium phosphate is used as a repairing material to be applied to the alkalescent soil, and the bioavailability of the heavy metal Cd in the alkalescent soil can be effectively reduced. Moreover, after monocalcium phosphate is applied to soil, calcium, phosphorus and other nutrient elements required by crop growth can be provided, and the soil fertility is kept. In addition, the monocalcium phosphate is low in price and easy to obtain, and is a commodity which can be massively produced in existing factories.

Description

technical field [0001] The invention relates to the technical field of prevention and control of soil heavy metal pollution, in particular to the application of calcium dihydrogen phosphate as a restoration material in reducing the bioavailability of Cd in weakly alkaline soil. Background technique [0002] In recent years, heavy metal pollution in cultivated land soil in my country has become more and more serious, and the primary pollutant is heavy metal Cd. Cd is a non-essential element for organisms, and it is considered as the most toxic heavy metal due to its high mobility, high toxicity, high accumulation and difficult elimination. [0003] At present, there are many methods to control soil heavy metal pollution, including chemical leaching, phytoremediation and chemical passivation. Among them, chemical passivation mainly reduces the harm of heavy metal pollution by reducing the bioavailability of heavy metals in soil. This technology has the advantages of simple im...

Claims

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Application Information

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IPC IPC(8): C09K17/06B09C1/08
CPCB09C1/08B09C2101/00C09K17/06
Inventor 夏睿智周静梁家妮张晨周俊周典海
Owner INST OF SOIL SCI CHINESE ACAD OF SCI
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