CN1262185C - Film-coated slow-released complexing agent for plant improving soil and preparation process thereof - Google Patents
Film-coated slow-released complexing agent for plant improving soil and preparation process thereof Download PDFInfo
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- CN1262185C CN1262185C CN 02148882 CN02148882A CN1262185C CN 1262185 C CN1262185 C CN 1262185C CN 02148882 CN02148882 CN 02148882 CN 02148882 A CN02148882 A CN 02148882A CN 1262185 C CN1262185 C CN 1262185C
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Abstract
The present invention relates to a coated sustained release complexing agent for improving soil for plants and a preparation method thereof. The complexing agent is a granular complexing agent coated with soluble silicate film with the thickness of 0.1 to 0.2mm on the surface. The content in the soluble silicate film is a mixture of complexing agents and adhesion agents, and the weight ratio of the adhesion agents to the complexing agents is 0.4 to 5:100. The preparation method for the complexing agent comprises the steps that a. the soluble adhesion agents and the complexing agents are compounded according to the portion ratio by weight of 0.4 to 5:100 and form granules with the diameter of 3 to 5mm under the action of the atmospheric pressure of 0.25 to 1; b. the formed granules are placed in a rotatable container, and soluble silicate solution is alternately sprayed on the granules and dried with hot air until one soluble silicate film with the thickness of 0.1 to 0.2mm is coated on the outer surface of each of the granules. After coating the complexing agent, the present invention applies the complexing agent in the root zone of a plant; the release speed of the complexing agent is controlled by controlling the thickness of the coating film, the concentrative absorption of heavy metals by the plant can be enhanced, the service efficiency of the complexing agent is increased to different extents, and the environmental risk caused by the application of complexing agents is reduced.
Description
Invention field
The invention belongs to the complexing agent field that is used for plant soil restoration, particularly a kind of coating formula slowly-releasing complexing agent that is used for plant soil restoration and preparation method thereof.
Background technology
The phytoremediation technology that is used for repairing polluted soil has closely become an interior research focus of environmental science during the last ten years.Along with going deep into of research, this technology has been applied to pollution control (Chen, et al, 2001 of contained Pb, Zn in the soil, Cd, Cu, Ni, Cr and radioactive element U; Huang, etal, 1998, Kayser, et al, 2000).At present the phytoremediation company that constantly occurs in states such as America and Europes promptly is that this technology has become ripe and formed the sign of an industry.Scholarly forecast is arranged, and phytoremediation technology will become developing country, as the important means of states such as China, India to the contaminated soil reparation.Its basic principle is, utilizes the pollutant in the plant absorbing soil and it is transferred to acrial part, and then can reach the purpose of removing pollutant in soil by the results plant.Yet, with plant soil is being carried out in the process of phytoremediation, because contained heavy metal (as Pb, Cu) exists with the form of insoluble compound usually in the soil, the biological effectiveness of carrying out phytoremediation is very low; Common way is: add complexing agent and improve the dissolubility of heavy metal in pollution medium in soil, to increase the biological effectiveness of phytoremediation.This technology is known as chelation evoked phytoremediation technology, is a frontier branch of science that just has been born at the twentieth century end, but also is a new technology (Luo Yongming, 2000 (2) soil) that receives much attention and favor.The adding of complexing agent is at present mostly adopted complexing agent is made into the method that is manured into soil again behind the certain concentration solution, the drawback that this method exists:
1. add complexing agent, in the extremely short time, pass through complexing, the activity of heavy metal is increased sharply, but (as one day) plant can only absorb in the soil the seldom heavy metal of a part within a certain period of time, and other is not still remained in the soil by the heavy metal that plant absorbing a large amount of have activated like this, also since its mobility strengthen, can move down gradually in time, polluted underground water causes great environmental risk, and the complexing agent of adding has inevitably improved the environmental risk to groundwater contamination.Close down with regard to U.S. PHYTOTECH company (tame phytoremediation company), when the scientist who has sums up lesson, think to lack the one of the main reasons that understanding and control to environmental risk are its failure.The environmental risk problem that solves as can be seen the complexing agent application from this example is an extremely urgent problem that is related to chelation evoked phytoremediation technology development;
2. under the effect of edaphon etc., complexing agent can be lost validity gradually, report in this respect is not quite similar at present, according to Wu longhua, the research of 2001 couples of EDTA (ethylenediamine tetra-acetic acid) was used behind this complexing agent after 6 days, approximately only remained 62% complexing agent in the soil, approximately have only 25% after 12 days, this also is a kind of waste of resource virtually;
3. from the space, plant the amount of absorbent heavy metal depend mainly on the concentration of root district heavy metal.And the method that adds with solution, one of defective is that complexing agent disperses in pollution medium spatial distributions such as soil, and plant can only absorb near the heavy metal in root district, has so just reduced the service efficiency of complexing agent; The heavy metal that two of defective has been to activate is easy to ooze with under the solution, when surpassing the root district, this part heavy metal on plants is invalid, under leaching, eating condition, very easily cause the secondary pollution of underground water or surface water, will constitute serious potential hazard environment, ecology and health.
Summary of the invention
The objective of the invention is to overcome and use many defectives that above-mentioned complexing agent exists, and the safe and reliable coating formula slowly-releasing complexing agent that is used for plant soil restoration is provided, can reduce the environmental risk of using complexing agent in the phytoremediation process greatly.
Technical scheme of the present invention is as follows:
The coating formula slowly-releasing complexing agent that is used for plant soil restoration provided by the invention is characterized in that, this coating formula slowly-releasing complexing agent is for being coated with the granular complexing agent of 0.1-0.2 millimeter thickness soluble silicate film on its surface; Content in its silicate thin film is the mixture of being made up of complexing agent and solubility adhesive, and the weight portion proportioning of described solubility adhesive and complexing agent is 0.4-5: 100;
Described complexing agent is that ethylenediamine tetra-acetic acid or its sodium salt or its sylvite, diethyl pentetic acid or its sodium salt or its sylvite, ethylenediamine (oxygen ethyl nitrogen base) tetraacethyl sodium or its sodium salt or its sylvite, ethylenediamine two salicyl acetate or its sodium salt or its sylvite, CDTA or its sodium salt or its sylvite, ethoxy are for ethylenediamine triacetic acid or its sodium salt or its sylvite or nitrilotriacetic acid or its sodium salt or its sylvite;
Described solubility adhesive is gum Arabic, maleated rosin, disproportionated rosin, hydrogenated rosin, rosin, peach gum, abies balsam, tannin extract, gelatin, lac, sodium alginate or dextrin.
The preparation method who is used for the coating formula slowly-releasing complexing agent of plant soil restoration provided by the invention is characterized in that preparation process is as follows:
A, solubility adhesive and complexing agent are 0.4-5 by weight ratio: 100 are mixed, and under 0.25-1 atmospheric pressure effect, making its formation diameter is the particle of 3-5 millimeter;
B, the particle that step a) is formed are inserted in the rotating container, and alternately implement to spray mensuration dissolubility silicic salting liquid and hot-air seasoning to this particle, the soluble silicate film that coats 0.1-0.2 millimeter thickness to this particle outer surface ends, and the weight percent concentration of employed mensuration dissolubility silicic salting liquid is 35-40%;
Described complexing agent is that ethylenediamine tetra-acetic acid or its sodium salt or its sylvite, diethyl pentetic acid or its sodium salt or its sylvite, ethylenediamine (oxygen ethyl nitrogen base) tetraacethyl sodium or its sodium salt or its sylvite, ethylenediamine two salicyl acetate or its sodium salt or its sylvite, CDTA or its sodium salt or its sylvite, ethoxy are for ethylenediamine triacetic acid or its sodium salt or its sylvite or nitrilotriacetic acid or its sodium salt or its sylvite;
Described solubility adhesive is gum Arabic, maleated rosin, disproportionated rosin, hydrogenated rosin, rosin, peach gum, abies balsam, tannin extract, gelatin, lac, sodium alginate or dextrin.
Advantage of the present invention is as follows:
The present invention applies the plant roots district again to the complexing agent coating, by the thickness of control coating, can control the rate of release of complexing agent; Complexing agent can slowly discharge with available state; Because complexing agent coating of the present invention can mainly be executed when using at the root layer, its influence area mainly concentrates near the zonule of complexing agent particle; This invention has increased the concentrated absorption of plant to heavy metal on the one hand; On the other hand, raising in various degree the service efficiency of complexing agent, reduced the environmental risk of using complexing agent simultaneously.
Description of drawings
Accompanying drawing 1 applies the schematic diagram of mode to the influence of organic carbon in the soil and soil extraction total organic carbon for different complexing agents;
Accompanying drawing 2 is the schematic diagram that organic carbon changes in the soil behind the use coating formula slowly-releasing complexing agent of the present invention;
Fig. 1: ordinate is an organic carbon content, and abscissa is a processing mode;
CK is organic carbon content in the preceding soil of experiment;
SE is for applying behind the 1.5 gram disodium ethylene diamine tetraacetate pressed powders organic carbon content in the soil;
LE contains behind the 1.5 gram disodium ethylene diamine tetra-acetic acid solutions organic carbon content in the soil for applying;
CE is for applying behind the coating formula slowly-releasing complexing agent of the present invention organic carbon content in the soil;
Fig. 2: ordinate is an organic carbon content, and abscissa is for handling fate.
Embodiment
Embodiment 1, and prepare the coating formula slowly-releasing complexing agent that is used for plant soil restoration of the present invention: its preparation process is as follows:
1, be to be mixed at 0.4: 100 by weight ratio with adhesive (disproportionated rosin or abies balsam) respectively with ethylenediamine tetra-acetic acid, disodium ethylene diamine tetraacetate, EDTAP dipotassium ethylene diamine tetraacetate, under 0.25-1 atmospheric pressure effect, making it form diameter respectively is the particle of 3-5 millimeter;
2, the particle that forms is inserted respectively in the rotating container, under the situation that particle constantly rolls, alternately implement to spray mensuration dissolubility silicic salting liquid and hot-air seasoning to this particle, the soluble silicate film that coats 0.1-0.2 millimeter thickness to this particle outer surface ends; The weight percent concentration of employed mensuration dissolubility silicic salting liquid is 40%.
The coating formula slowly-releasing complexing agent that present embodiment is prepared: content is that the coating formula slowly-releasing complexing agent of ethylenediamine tetra-acetic acid replaces with D1, content is that the coating formula slowly-releasing complexing agent of disodium ethylene diamine tetraacetate replaces with D2, and content is that the coating formula slowly-releasing complexing agent of EDTAP dipotassium ethylene diamine tetraacetate replaces with D3.
Experimental result is as follows:
1. slow release effect:
This test uses distilled water and soil as carrier respectively, and the coating formula slowly-releasing complexing agent that present embodiment is prepared is placed on respectively in the water and soil earth, represents slow release effect, its result such as table 1 with discharging used fate fully;
Table 1:
| Fate (in the water) | Fate (in the soil) | |
| D1 D2 D3 | 3 1.5-2.5 2-2.5 | 16 14-17 15-18 |
2. result of use:
Test used soil specimen and pick up from Anhui Province, be the aleuritic texture clay loam, the full lead content of soil is 359.07 ± 27.14mg kg before the test
-1Each basin is with 300 gram soil, with 1.5 gram disodium ethylene diamine tetraacetate pressed powders apply be numbered in the SE basin even with earth mixture; The solution that will contain 1.5 gram disodium ethylene diamine tetraacetates apply and are numbered in the LE basin and soil, the coating formula slowly-releasing complexing agents of the present invention that will contain 1.5 gram disodium ethylene diamine tetraacetates join in the basin that is numbered CE in about 2 centimetres zone, basin central point in the soil, to move in each basin through the water planting milpa: after test is implemented after 7 days, the plumbous amount of lead concentration in the measured milpa and absorption, above-mentioned experiment triplicate, ask its mean value, its result such as table 2, CK is the preceding full lead content of soil of test in the table;
Subordinate list 2: different disodium EDTAs apply the comparison of mode to the plumbous amount of plant absorbing
| Acrial part lead concentration (mgkg 1) | Remove plumbous amount (mg plant -1) | |
| CK SE CE LE | 61.0±6.3 444.9±15.8 524.6±20.2 * 771.3±19.7 | 0.0249±0.003 0.1221±0.011 0.1305±0.016 0.1186±0.009 |
* the result that surveys during about 60-70% for coating formula network of the present invention and agent only discharge of notebook data.
Use complexing agent environmental risk of the present invention:
Accompanying drawing 1 applies the influence of mode to soil organic carbon and soil extraction total organic carbon (TOC) for different disodium EDTAs.
According to Monika et al, research in 1998, apply complexing agent after, the pouring capacity of heavy metal depends mainly on three factors: precipitation, the complexing agent concentration that exists in the soil, and the physicochemical property of soil.Suppose that the complexing agent concentration that exists in the soil is high more under the constant situation of the physicochemical property of precipitation and soil, then risk is big more, otherwise, then more little.And for the concentration of complexing agent in the soil, can be with total organic carbon (TOC) expression of organic carbon in the soil and unit soil extraction.As can be seen from Figure 1, use coating formula slowly-releasing complexing agent of the present invention (the CE mode applies), can obviously reduce the organic carbon in the soil and the organic carbon of leaching liquor, exist the amount of complexing agent lower in the expression soil, according to the result of study of Monika et al. (1998), show that this method of application can significantly reduce the environmental risk of its leaching.
Accompanying drawing 2 is the situation of change of phytoremediation process soil organic carbon: as can be seen from Figure 2, organic carbon content in the soil does not have significant change in 0-17 days after using coating formula slowly-releasing complexing agent of the present invention, substantially maintain a constant value, promptly similar to contrast, shown that further the slowly-releasing complexing agent is to reducing the useful effect of environmental risk.
In like manner, the coating formula slowly-releasing complexing agent of the present invention of coating ethylenediamine tetra-acetic acid and coating ethylene diamine tetraacetic acid sylvite also experimentizes with said method, now the result simply is expressed as follows, use the coating ethylene diamine tetraacetic acid sylvite, it is 0.1418 ± 0.0015mg/ strain plant that acrial part can be removed plumbous amount, is higher than solution and adds mode 0.1236 ± 0.0025mg/ strain plant.And use behind the coating, its soil organic carbon is 0.1309 ± 0.0052%, is lower than solution to apply soil organic carbon 0.1623 ± 0.0041% under the mode; Use the coating ethylenediamine tetra-acetic acid, it is 0.1102 ± 0.0009mg/ strain plant that acrial part can be removed plumbous amount, is higher than solution and applies mode 0.0958 ± 0.0032mg/ strain plant.Same, soil organic carbon also hangs down about 20.7% behind the coating.
Embodiment 2, and prepare the coating formula slowly-releasing complexing agent that is used for plant soil restoration of the present invention: its preparation process is as follows:
1, be respectively to be mixed at 5: 100 by weight ratio with adhesive (gum Arabic or tannin extract) respectively with ethylenediamine (oxygen ethyl nitrogen base) tetraacethyl, ethylenediamine (oxygen ethyl nitrogen base) tetraacethyl trisodium, ethylenediamine (oxygen ethyl nitrogen base) tetraacethyl tripotassium, under 0.25-1 atmospheric pressure effect, making it form diameter respectively is the particle of 3-5 millimeter;
The coating formula slowly-releasing complexing agent that present embodiment is prepared: content is that the coating formula slowly-releasing complexing agent of ethylenediamine (oxygen ethyl nitrogen base) tetraacethyl replaces with F1, content is that the coating formula slowly-releasing complexing agent of ethylenediamine (oxygen ethyl nitrogen base) tetraacethyl trisodium replaces with F2, and content is that the coating formula slowly-releasing complexing agent of ethylenediamine (oxygen ethyl nitrogen base) tetraacethyl tripotassium replaces with F3.
2, the particle that forms is inserted in the rotating container, and alternately implement to spray mensuration dissolubility silicic salting liquid and hot-air seasoning to this particle, the soluble silicate film that coats 0.1-0.2 millimeter thickness to this particle outer surface ends, and the weight percent concentration of employed mensuration dissolubility silicic salting liquid is 35%.
Experimental result is as follows, and is more in view of test data, so only choose with representational two indexs, descends together)
| The phytoremediation effect a | Environmental risk b | |
| F1 coating solution | 0.0726±0.021 0.0632±0.015 | 0.1562±0.0032 0.1732±0.0022 |
| F2 coating solution | 0.1008±0.011 0.0882±0.007 | 0.1438±0.0023 0.1622±0.0051 |
| F3 coating solution | 0.1130±0.025 0.0961±0.018 | 0.1326±0.0061 0.1515±0.0040 |
Annotate: a in the table for the phytoremediation effect with total Pb removal amount (mg plant
-1) expression;
B is that environmental risk is represented with organic carbon % (complexing agent) content in the soil; Data are the mean value and the standard deviation of three repetitions in the table; Down together.
Embodiment 3, and prepare the coating formula slowly-releasing complexing agent that is used for plant soil restoration of the present invention: its preparation process is as follows:
1, be to be mixed at 1: 100 by weight ratio with adhesive (hydrogenated rosin or gelatin) respectively with CDTA, hexane ethylenediamine tetraacetic acid (EDTA) one sodium, hexane ethylenediamine tetraacetic acid (EDTA) one potassium, under 0.25-1 atmospheric pressure effect, making it form diameter respectively is the particle of 3-5 millimeter; The coating formula slowly-releasing complexing agent that present embodiment is prepared: content is that the coating formula slowly-releasing complexing agent of CDTA replaces with W1, content is that the coating formula slowly-releasing complexing agent of CDTA one sodium replaces with W2, and content is that the coating formula slowly-releasing complexing agent of CDTA one potassium replaces with W3.
2, the particle that forms is inserted in the rotating container, and alternately implement to spray mensuration dissolubility silicic salting liquid and hot-air seasoning to this particle, the soluble silicate film that coats 0.1-0.2 millimeter thickness to this particle outer surface ends, and the weight percent concentration of employed mensuration dissolubility silicic salting liquid is 38%.
Experimental result is as follows:
| The phytoremediation effect | Environmental risk | |
| W1 coating solution | 0.0637±0.018 0.0519±0.037 | 0.1261±0.0083 0.1433±0.0117 |
| W2 coating solution | 0.0856±0.010 0.0735±0.005 | 0.1267±0.0058 0.1437±0.0024 |
| W3 coating solution | 0.0742±0.035 0.0647±0.011 | 0.1032±0.0032 0.1139±0.0027 |
Embodiment 4, and prepare the coating formula slowly-releasing complexing agent that is used for plant soil restoration of the present invention: its preparation process is as follows:
1, be to be mixed at 2: 100 by weight ratio with adhesive (maleated rosin) respectively with diethyl pentetic acid, diethyl pentetic acid four sodium, diethyl pentetic acid four potassium, under 0.25-1 atmospheric pressure effect, making it form diameter respectively is the particle of 3-5 millimeter; The coating formula slowly-releasing complexing agent that present embodiment is prepared: content is that the coating formula slowly-releasing complexing agent of diethyl pentetic acid replaces with Q1, content is that the coating formula slowly-releasing complexing agent of diethyl pentetic acid four sodium replaces with Q2, and content is that the coating formula slowly-releasing complexing agent of diethyl pentetic acid four potassium replaces with Q3.
2, the particle that forms is inserted in the rotating container, and alternately implement to spray mensuration dissolubility silicic salting liquid and hot-air seasoning to this particle, the soluble silicate film that coats 0.1-0.2 millimeter thickness to this particle outer surface ends, and the weight percent concentration of employed mensuration dissolubility silicic salting liquid is 36%.
Experimental result is as follows:
| The phytoremediation effect | Environmental risk | |
| Q1 coating solution | 0.0835±0.059 0.0615±0.064 | 0.1312±0.0113 0.1517±0.0042 |
| Q2 coating solution | 0.1276±0.019 0.1035±0.015 | 0.1299±0.0017 0.1472±0.0019 |
| Q3 coating solution | 0.1114±0.021 0.1020±0.050 | 0.1018±0.0072 0.1145±0.0036 |
Embodiment 5, and prepare the coating formula slowly-releasing complexing agent that is used for plant soil restoration of the present invention: its preparation process is as follows:
1, with adhesive (or lac) by weight ratio be 3: 100 be mixed for ethylenediamine triacetic acid disodium, ethoxy respectively for the ethylenediamine triacetic acid dipotassium for ethylenediamine triacetic acid, ethoxy with ethoxy, under 0.25-1 atmospheric pressure effect, making it form diameter respectively is the particle of 3-5 millimeter; The coating formula slowly-releasing complexing agent that present embodiment is prepared: content is that ethoxy replaces the coating formula slowly-releasing complexing agent of ethylenediamine triacetic acid to replace with X1, content is that ethoxy replaces the coating formula slowly-releasing complexing agent of ethylenediamine triacetic acid disodium to replace with X2, and content is that ethoxy replaces the coating formula slowly-releasing complexing agent of ethylenediamine triacetic acid dipotassium to replace with X3.
2, the particle that forms is inserted in the rotating container, and alternately implement to spray mensuration dissolubility silicic salting liquid and hot-air seasoning to this particle, the soluble silicate film that coats 0.1-0.2 millimeter thickness to this particle outer surface ends, and the weight percent concentration of employed mensuration dissolubility silicic salting liquid is 37%.
Experimental result is as follows:
| The phytoremediation effect | Environmental risk | |
| X1 coating solution | 0.0536±0.039 0.0457±0.011 | 0.1362±0.0112 0.1491±0.0027 |
| X2 coating solution | 0.0865±0.023 0.0617±0.011 | 0.1081±0.0068 0.1135±0.0026 |
| X3 coating solution | 0.0735±0.025 0.0720±0.015 | 0.1192±0.0201 0.1306±0.0141 |
Embodiment 6, and prepare the coating formula slowly-releasing complexing agent that is used for plant soil restoration of the present invention: its preparation process is as follows:
1, be to be mixed at 3.5: 100 by weight ratio with adhesive (peach gum or sodium alginate) respectively with nitrilotriacetic acid, nitrilotriacetic acid disodium salt, nitrilotriacetic acid dipotassium, under 0.25-1 atmospheric pressure effect, making it form diameter is the particle of 3-5 millimeter; The coating formula slowly-releasing complexing agent that present embodiment is prepared: content is that the coating formula slowly-releasing complexing agent of nitrilotriacetic acid replaces with Z1, content is that the coating formula slowly-releasing complexing agent of nitrilotriacetic acid disodium salt replaces with Z2, and content is that the coating formula slowly-releasing complexing agent of nitrilotriacetic acid dipotassium replaces with Z3.
2, the particle that forms is inserted in the rotating container, and alternately implement to spray mensuration dissolubility silicic salting liquid and hot-air seasoning to this particle, the soluble silicate film that coats 0.1-0.2 millimeter thickness to this particle outer surface ends, and the weight percent concentration of employed mensuration dissolubility silicic salting liquid is 38%.
Experimental result is as follows:
| The phytoremediation effect | Environmental risk | |
| Z1 coating solution | 0.0523±0.019 0.0469±0.011 | 0.1027±0.0012 0.1286±0.0031 |
| Z2 coating solution | 0.0605±0.021 0.0478±0.013 | 0.1164±0.0031 0.1309±0.0048 |
| Z3 coating solution | 0.0633±0.022 0.0504±0.034 | 0.1002±0.0151 0.1216±0.0210 |
Embodiment 7, and prepare the coating formula slowly-releasing complexing agent that is used for plant soil restoration of the present invention: its preparation process is as follows:
1, be to be mixed at 4: 100 by weight ratio with adhesive (dextrin) respectively with ethylenediamine two salicyl acetate, ethylenediamine two salicyl acetate one sodium, ethylenediamine two salicyl acetate one potassium, under 0.25-1 atmospheric pressure effect, making it form diameter is the particle of 3-5 millimeter; The coating formula slowly-releasing complexing agent that present embodiment is prepared: content is that the coating formula slowly-releasing complexing agent of ethylenediamine two salicyl acetate replaces with V1, content is that the coating formula slowly-releasing complexing agent of ethylenediamine two salicyl acetate one sodium replaces with V2, and content is that the coating formula slowly-releasing complexing agent of ethylenediamine two salicyl acetate one potassium replaces with V3.
2, the particle that forms is inserted in the rotating container, and alternately implement to spray mensuration dissolubility silicic salting liquid and hot-air seasoning to this particle, the soluble silicate film that coats 0.1-0.2 millimeter thickness to this particle outer surface ends, and the weight percent concentration of employed mensuration dissolubility silicic salting liquid is 39%.
Experimental result is as follows:
| The phytoremediation effect | Environmental risk | |
| V1 coating solution | 0.0645±0.027 0.0535±0.019 | 0.1263±0.0042 0.1366±0.0036 |
| V2 coating solution | 0.0915±0.035 0.0706±0.018 | 0.1336±0.0025 0.1599±0.0032 |
| V3 coating solution | 0.1033±0.038 0.0987±0.061 | 0.1128±0.0046 0.1361±0.0028 |
Claims (2)
1, a kind of coating formula slowly-releasing complexing agent that is used for plant soil restoration is characterized in that, this coating formula slowly-releasing complexing agent is for being coated with the granular complexing agent of 0.1-0.2 millimeter thickness soluble silicate film on its surface; Content in its soluble silicate film is the mixture of being made up of complexing agent and adhesive, and the weight portion proportioning of described adhesive and complexing agent is 0.4-5: 100;
Described complexing agent is that ethylenediamine tetra-acetic acid or its sodium salt or its sylvite, diethyl pentetic acid or its sodium salt or its sylvite, ethylenediamine (oxygen ethyl nitrogen base) tetraacethyl sodium or its sodium salt or its sylvite, ethylenediamine two salicyl acetate or its sodium salt or its sylvite, CDTA or its sodium salt or its sylvite, ethoxy are for ethylenediamine triacetic acid or its sodium salt or its sylvite or nitrilotriacetic acid or its sodium salt or its sylvite;
Described adhesive is gum Arabic, maleated rosin, disproportionated rosin, hydrogenated rosin, rosin, peach gum, abies balsam, tannin extract, gelatin, lac, sodium alginate or dextrin.
2, a kind of by the described preparation method who is used for the coating formula slowly-releasing complexing agent of plant soil restoration of claim 1, it is characterized in that preparation process is as follows:
A, solubility adhesive and complexing agent are 0.4-5 by weight ratio: 100 are mixed, and under 0.25-1 atmospheric pressure effect, making its formation diameter is the particle of 3-5 millimeter;
Described complexing agent is that ethylenediamine tetra-acetic acid or its sodium salt or its sylvite, diethyl pentetic acid or its sodium salt or its sylvite, ethylenediamine (oxygen ethyl nitrogen base) tetraacethyl sodium or its sodium salt or its sylvite, ethylenediamine two salicyl acetate or its sodium salt or its sylvite, CDTA or its sodium salt or its sylvite, ethoxy are for ethylenediamine triacetic acid or its sodium salt or its sylvite or nitrilotriacetic acid or its sodium salt or its sylvite;
Described adhesive is gum Arabic, maleated rosin, disproportionated rosin, hydrogenated rosin, rosin, peach gum, abies balsam, tannin extract, gelatin, lac, sodium alginate or dextrin;
B, the particle that step a) is formed are inserted in the rotating container, and alternately implement to spray mensuration dissolubility silicic salting liquid and hot-air seasoning to this particle, and the soluble silicate film that coats 0.1-0.2 millimeter thickness to this particle outer surface ends; The weight percent concentration of employed mensuration dissolubility silicic salting liquid is 35-40%.
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| CN101518780B (en) * | 2008-12-31 | 2011-09-14 | 广东省生态环境与土壤研究所 | Complexing agent microcapsule for plant soil restoration and preparation method thereof |
| CN101525260B (en) * | 2009-04-13 | 2012-09-26 | 江西省农业科学院土壤肥料与资源环境研究所 | Special calcium silicon-rich controlled release fertilizer for southern paddy rice and preparation method thereof |
| CN104056849B (en) * | 2014-04-28 | 2015-11-18 | 杭州师范大学 | A kind of method of adsorption treatment heavy metal in soil cadmium |
| CN106190133A (en) * | 2016-07-19 | 2016-12-07 | 东华理工大学 | Slow release chelating agen for plant soil restoration and preparation method thereof |
| CN110408407A (en) * | 2019-08-21 | 2019-11-05 | 长沙凯泽工程设计有限公司 | A kind of tobacco-growing soil cadmium passivator and preparation method thereof |
| CN110681683A (en) * | 2019-10-10 | 2020-01-14 | 太仓该亚机器人科技有限公司 | Complexing agent microcapsule for phytoremediation soil and preparation method thereof |
| CN113058978B (en) * | 2021-03-26 | 2022-02-15 | 深圳金普迈生物科技有限公司 | Production process of heavy metal mediated biochar compound solidified by silicate |
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