CN111646859A - Application of methylglycine diacetic acid and derivatives thereof as soil ion capture agent and soil remediation method - Google Patents

Abstract

The invention belongs to the technical field of soil remediation, and relates to the application of methylglycine diacetic acid and its derivatives as soil ion scavengers and a soil remediation method. Ion scavengers and ion activators. The beneficial effects of the invention are as follows: it can activate the insoluble nutrient elements such as calcium and magnesium in the soil, and promote the absorption of plants; it can improve the hardening of the soil caused by the addition of metal salts; it can be degraded without secondary damage to the soil; At the same time, it supplements the soil with nitrogen, which has multiple functions; it is beneficial to the restoration and improvement of soil fertility. The method of use is simple, and it can be applied directly to the soil.

Description

Application of a kind of methylglycine diacetic acid and its derivatives as soil ion scavengers use and soil remediation methods

technical field

The invention belongs to the technical field of soil remediation, and in particular relates to the application of methylglycine diacetic acid and its derivatives as soil ion scavengers and a soil remediation method.

Background technique

The salinization and alkalinization of soil and water are often the limiting factors for soil development and utilization, and are also urgent problems to be solved in many countries, especially in arid and semi-arid regions, several river deltas and plain areas with poor outflow.

The total area of saline soil in the world is about 9.5×108hm ² , accounting for 7.26% of the earth's land area. The total area of saline soil in China is 3.6×107hm ² , among which the problem of salinization and alkalization of northern soil is obvious.

Calcium, magnesium, zinc, manganese, iron, copper and other elements are trace elements necessary for plant growth. Although these elements are not lacking in nature, they are generally less available for direct absorption and utilization by plants. The reason is that these elements are easily deposited as insoluble salts in the soil environment, or are adsorbed by soil colloids and cannot move , resulting in the inability to be absorbed and utilized by plants. In order to supplement trace elements to plants, there are two commonly used methods: one is soil application of inorganic minerals containing corresponding trace elements, and the other is foliar spraying of chelated fertilizer.

The price of inorganic minerals is relatively low, and it can be applied directly or after being dissolved in water. It has a large amount of fertilizer and a long fertilizer effect period, which is acceptable to the market. However, the metal ions in inorganic minerals cannot avoid being fixed by the soil, the utilization rate is low, and the precipitation in the environment can easily cause pollution, or cause inorganic salt poisoning due to excessive fertilization.

At present, all methods of supplementing trace elements to plants on the market are to apply fertilizers containing corresponding metal elements. Long-term application will cause excessive deposition of metal ions in the soil, resulting in soil hardening and hardening, thus affecting the growth and development of crops in the later season.

How to effectively control the excess metal ions in soil has become an extensive research topic. In the prior art, irrigation methods and chemical methods such as adding desulfurized gypsum are usually adopted.

Irrigation in arid regions will inevitably increase soil salinity (the accumulation of mineral elements in the soil surface in irrigation water) unless there is a good drainage system; but even with a good irrigation and drainage system, the process of soil desalination is often accompanied by soil alkalization. .

Adding chemical methods such as desulfurization gypsum, in addition to increasing soil salinity, the improvement cost is also high.

The Chinese patent "A quick fertilization method for northern coastal saline-alkali land" (application number 201611177213.7) discloses a method for improving saline-alkali land by irradiating salt water with microwaves. Residual insoluble cations cannot be effectively removed.

None of the prior art can effectively utilize a large amount of insoluble metal elements existing in the soil while activating the soil.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide the application and soil remediation method of methylglycine diacetic acid and its derivatives as soil ion scavengers, so as to solve the problems in the prior art.

A kind of application of methyl glycine diacetic acid and its derivatives as soil ion scavengers, the compound shown in general formula (II) and all possible isomers thereof, or methyl glycine diacetic acid and all possible isomeric isomers thereof. The hydrate of the structure is used in soil as an ion scavenger;

Wherein: M can be one or more of H ⁺ , NH ₄ ⁺ , Na ⁺ , K ⁺ , Ca ²⁺ , Zn ²⁺ , Mg ²⁺ , Cu ²⁺ , Mn ²⁺ , Fe ³⁺ .

Preferably, for the application of the methylglycine diacetic acid and its derivatives as soil ion scavengers, the salt of the methylglycine diacetic acid adopts at least one or a mixture of several salts of sodium, potassium and ammonia.

Further, in the application of the methylglycine diacetic acid and its derivatives as soil ion scavengers, the compound represented by the general formula (II) and all possible isomers thereof, or the compound represented by the general formula (II) Mixtures of any of the compounds and their hydrates of all possible isomers act as soil ion scavengers.

Further, the application of the methyl glycine diacetic acid and its derivatives as soil ion scavengers, the use of the compound represented by the general formula (II) and all possible isomers thereof, or the general formula (II) One or more polymer resins of the compounds shown and hydrates of all possible isomers are used as soil ion scavengers.

Further, the application of the methylglycine diacetic acid and its derivatives as soil ion scavengers is used for the yellow fluvo-aquic soil and cinnamon soil in the North China Plain, the yellow soil in the Yunnan-Guizhou region, the chernozem in the northeast region and the chestnut soil in the northwest region. in the soil.

Further, the application of the methylglycine diacetic acid and its derivatives as soil ion scavengers is used in soils that have been compacted by traditional fertilizers for a long time.

The invention also discloses a soil remediation method, comprising the following steps:

Step 1, the soil ion trapping agent is spread on the soil surface to be repaired, and the spreading density is 0.1-10 mol of the compound shown in the general formula (II) per acre;

Step 2. Plant plants and/or sprinkle water on the soil spread in Step 1.

Further, the soil remediation method, when dealing with soil with strong salinization degree, further includes a pretreatment step before step 1:

Pretreatment step 1, use salt water to irrigate saline-alkali land and wait to freeze into salt water ice;

Pre-processing step 2, the salt water ice is radiantly heated; the salt water ice is melted and infiltrated.

Further, the salinity of the underground salt water used in the pretreatment step 1 is less than or equal to 35g/L.

Further, the amount of underground salt water irrigation used in the pretreatment step 1 is greater than or equal to 20 m ³ /mu.

Further, when the underground salt water is irrigated in the pretreatment step 1, the thickness of the frozen soil layer is greater than 5 cm and less than 50 cm.

Further, the radiation source used in the radiation heating in the pretreatment step 2 is microwaves with a frequency of 1MHz-24.125GHz, and the radiation power is 1kW-20kW.

Further, the radiation source used in the radiation heating in the pretreatment step 2 is microwaves with a frequency of 915MHz-2450MHz.

Further, the salt water is selected from sea water, underground salt water, surface salt water, artificially configured salt water, and any one or more of them are mixed in any proportion.

The beneficial effects of the present invention are:

1. It can activate the insoluble calcium and magnesium and other nutrients in the soil, and promote the absorption of plants;

2. It can improve the compaction of soil caused by the addition of metal salts;

3. Degradable, no secondary damage to the soil;

4. While improving soil compaction, it can supplement nitrogen elements to the soil, which has multiple functions; it is beneficial to the restoration and improvement of soil fertility.

5. The use method is simple, and it can be directly applied to the soil.

Detailed ways

The technical solutions of the present invention will be described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Example 1

An application of methylglycine diacetic acid and its derivatives as soil ion trapping agents and a soil remediation method, the compound (A1) is applied to fertilizers as trace element supplements and nitrogen fertilizer supplements:

The invention also discloses a soil remediation method, comprising the following steps:

Step 1, the soil ion trapping agent is spread on the soil surface to be repaired, and the spreading density is 1 mol of the compound (A1) per acre;

Step 2. Plant plants and/or sprinkle water on the soil spread in Step 1.

As described in this embodiment, the soil remediation method further includes a pretreatment step before step 1 when dealing with soils with a strong degree of salinization:

Pretreatment step 1, use salt water to irrigate saline-alkali land and wait to freeze into salt water ice;

Pre-processing step 2, the salt water ice is radiantly heated; the salt water ice is melted and infiltrated.

In this embodiment, the salinity of the underground salt water used in the pretreatment step 1 is less than or equal to 35 g/L.

According to this embodiment, the amount of underground salt water irrigation used in the pretreatment step 1 is greater than or equal to 20 m ³ /mu.

According to this embodiment, when the underground salt water is irrigated in the pretreatment step 1, the thickness of the frozen soil layer is greater than 5 cm and less than 50 cm.

In this embodiment, the radiation source used in the radiation heating in the preprocessing step 2 is microwaves with a frequency of 1MHz-24.125GHz, and the radiation power is 1kW-20kW.

Examples 2-6

The usage is the same as in Example 1, except that the methylglycine diacetic acid derivatives are selected differently and the dosage is different. The selection and dosage of chelating agent are shown in Table 1:

Table 1 Methylglycine diacetic acid derivatives selected structural formula list

Claims (10)

1. the application of a kind of methylglycine diacetic acid and its derivative as soil ion scavenger, it is characterized in that, the compound shown in general formula (I) and all possible isomers thereof, or methylglycine diacetic acid and hydrates of all possible isomers, used in soils as ion scavengers;

Wherein: M can be one or more of H ⁺ , NH ₄ ⁺ , Na ⁺ , K ⁺ , Ca ²⁺ , Zn ²⁺ , Mg ²⁺ , Cu ²⁺ , Mn ²⁺ , Fe ³⁺ . 2. the application of methylglycine diacetic acid according to claim 1 and its derivative as soil ion scavenger, it is characterized in that, the salt of described methylglycine diacetic acid adopts at least one in sodium, potassium, ammonia or A mixture of several salts. 3. the application of methyl glycine diacetic acid and its derivatives as soil ion scavenger according to claim 1, is characterized in that, the compound represented by general formula (I) and all possible isomers thereof, or The compound represented by the general formula (I) and any mixtures of the hydrates of all possible isomers are used as soil ion scavengers. 4. the application of methyl glycine diacetic acid and its derivatives as soil ion scavenger according to claim 1, is characterized in that, using the compound represented by general formula (I) and all possible isomers thereof loaded with One or more polymer resins of the compound represented by the general formula (I) and the hydrates of all possible isomers are used as soil ion scavengers. 5 . The application of methylglycine diacetic acid and its derivatives according to any one of claims 1 to 4 as soil ion scavengers, characterized in that it is used in soils that have been hardened by traditional fertilizers for a long time. 6. a soil remediation method, is characterized in that, comprises the steps: Step 1, the soil ion trapping agent described in any one of claims 1-4 is spread on the soil surface to be repaired, and the spreading density is 0.1-10mol of the compound shown in the general formula (I) per acre; Step 2. Plant plants and/or sprinkle water on the soil spread in Step 1. 7. soil remediation method according to claim 6, is characterized in that, when processing the soil with strong salinization degree, also comprises pretreatment step before step 1: Pretreatment step 1, use salt water to irrigate saline-alkali land and wait to freeze into salt water ice; Pre-processing step 2, the salt water ice is radiantly heated; the salt water ice is melted and infiltrated. 8. The soil remediation method according to claim 7, wherein the salinity of the underground salt water used in the pretreatment step 1 is less than or equal to 35g/L; The amount of underground salt water irrigation is greater than or equal to 20 m ³ /mu; when the underground salt water is irrigated in the pretreatment step 1, the thickness of the frozen soil layer is greater than 5 cm and less than 50 cm. 9 . The soil remediation method according to claim 7 , wherein the radiation source used in the radiation heating in the pretreatment step 2 is microwaves with a frequency of 1MHz-24.125GHz, and the radiation power is 1kW-20kW. 10 . 10 . The soil remediation method according to claim 6 , wherein the salt water is mixed in any proportion of any one or several selected from sea water, underground salt water, surface salt water, and artificially configured salt water. 11 .