CN110252803A - A kind of cadmium pollution soil composite passivant and its application - Google Patents
A kind of cadmium pollution soil composite passivant and its application Download PDFInfo
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- CN110252803A CN110252803A CN201910667304.6A CN201910667304A CN110252803A CN 110252803 A CN110252803 A CN 110252803A CN 201910667304 A CN201910667304 A CN 201910667304A CN 110252803 A CN110252803 A CN 110252803A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/10—Reclamation of contaminated soil microbiologically, biologically or by using enzymes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
Abstract
The invention belongs to soil remediation fields, and in particular to a kind of cadmium pollution soil composite passivant and its application.The soil passivator that a kind of principle active component is pseudomonad is specifically included, required soil composite passivant can be prepared using the soil passivator and deactivation of support material.Soil passivator and soil composite passivant provided by the invention can both be passivated the heavy metal in soil, promote the growth of plant；Heavy metal can be obstructed simultaneously, absorption of the plant to metal Cd is effectively prevented, to reduce the residual of heavy metal in crops.With huge practical application value and promotion potential.
Description
Technical field
The invention belongs to soil remediation fields, and in particular to a kind of cadmium pollution soil composite passivant and its application.
Background technique
As industry continues to develop, heavy metal in soil pollution problem, especially cadmium pollution problem, it has also become the whole society closes
The hot spot of note.According to statistics, China's Cd-polluted farmland alreadys exceed 200,000 hectares at present, is related to 11 provinces and cities, 25 areas, every year
The exceeded agricultural product of cadmium content seriously endanger people's health up to 1,460,000 tons.For China's large area farmland cadmium pollution problem,
A kind of technical method that can be widely applied, be at low cost, not missing farming season is urgently developed, the biologically effective of cadmium in soil is reduced
Property, to reduce the content of cadmium in crops；The environment for improving soil simultaneously, improves the utilization rate of nitrogenous fertilizer.
The reparation of heavy-metal contaminated soil is broadly divided into in-situ immobilization and showering, and wherein in-situ immobilization is to pass through addition
Physical chemistry material or bacteria agent are adjusted soil physico-chemical property (such as pH, moisture content, cation exchange capacity (CEC) etc.), change a huge sum of money
Belong to occurrence patterns in soil environment, inhibit its bioactivity, reaches a simple and quickly and effectively in-situ immobilization soil huge sum of money
Belong to pollution.The in-situ immobilization of heavy-metal contaminated soil includes heavy metal passivation and removes.In-situ passivation recovery technique has processing
The advantages that time is short, relatively cheap, applied widely, it is considered to be centering low-concentration heavy metal polluted farmland soil reparation most has
One of method of effect.In recent years, the research of cadmium pollution soil passivation recovery technique has achieved a series of impressive progresses.Passivation side
Method includes: (1) addition inorganic passivant (addition lime, iron powder, clay etc.), adjusts soil pH and physicochemical property；(2) it is added with
Machine passivator (such as charcoal, modified organic material)；(3) biology passivation (microorganism) etc..Wherein, the application report of basic matterial
Road is more.But due to the complexity of soil texture, single passivator (such as inorganic passivant, organic passivation agent or life
Object passivator) it is unable to reach ideal soil remediation effect.Therefore, research and develop soil heavy metal combined passivator, to soil into
Row comprehensive treatment is just expected to thoroughly solve the problems, such as that heavy metal-polluted soil is repaired.
Summary of the invention
The object of the present invention is to provide a kind of reduction heavy metal in soil biological effectiveness, promote the compound blunt of plant growth
Agent and its application.
For achieving the above object, the technical scheme adopted by the invention is that: a kind of soil passivator, the soil are blunt
Agent is a kind of microbial bacterial agent, in the soil passivator, viable count >=1.0 × 10 of the pseudomonad9Cfu/ml or
≥1.0×109cfu/g；
The pseudomonad (Pseudomonas alcaliphila sp.) is preserved in the micro- life of China on January 2nd, 2008
Object culture presevation administration committee common micro-organisms collection, deposit number are CGMCC No.2318.
Correspondingly, the preparation method of the soil passivator, method include the following steps:
(1) recovery and activation of strain: the pseudomonad is inoculated into culture medium, and 25~30 DEG C of cultures 16~24 are small
When make actication of culture, be transferred in new culture medium according still further to 1%~5% inoculum concentration, 25~30 DEG C cultivate 16~24 hours,
Obtain seed liquor.；
Wherein, the formula of the culture medium are as follows: KNO31.0g, KH2PO41.0g, MgSO47H2O 1.0g, FeCl3·
6H2O 0.05g, CaCl2·2H2O 0.2g, trisodium citrate 5.13g, distilled water 1000ml；
(2) seed liquor is accessed according to 1%~5% inoculum concentration and expands culture in new culture medium, it is outstanding to obtain bacterium
Liquid, as required soil passivator.
Also it can according to need and bacteria suspension further processing be made as freeze-dried vaccine powder etc., needed for the freeze-dried vaccine powder is also
Soil passivator.
Correspondingly, the application method of the soil passivator, before plantation, is passivated 2~50 times of dilution agent using the soil
Immersion treatment is carried out to seed, or leaching root processing is carried out to seedling；
After plantation, carried out using 2~50 times of soil passivation dilution agent to around plant rhizosphere or around plantation seed
Spray processing.
Correspondingly, the soil composite passivant prepared using the soil passivator, the soil composite passivant component
It include: soil passivator, deactivation of support material；
The deactivation of support material includes at least calcium citrate iron-based material and sulfydryl swelling material；The calcium citrate iron
Sill includes at least calcium citrate and iron containing compounds.
Preferably, described method includes following steps:
(1) the calcium citrate iron-based material is uniformly mixed with sulfydryl swelling material 1:1~3 in mass ratio, is obtained
The deactivation of support material；
It (2) is in mass ratio that 1:10~50 are uniformly mixed with the deactivation of support material by the soil passivator, it is natural
It air-dries to get the soil composite passivant.
Preferably, the preparation method of the calcium citrate iron-based material includes the following steps:
(1) green vitriol: natrium carbonicum calcinatum: citric acid in molar ratio 1:1:1 mix, adjust pH be 7.0~
8.0, obtain substance A；
(2) citric acid is mixed with calcium oxide according to molar ratio 2:3, adjusting pH is 7.0~8.0, washes, filters to obtain precipitating
Object B；
It (3) is in mass ratio the mixing of 1:1~4 by step (1) substance A and step (2) described sediment B, naturally dry
It is dry to obtain the final product.
Preferably, the preparation method of the sulfydryl swelling material includes the following steps:
(1) cysteine hydrochloride and bentonite are mixed according to mass ratio 1:20~50, adds suitable quantity of water that suspension is made, adjusts
Saving pH is 8.0~8.5；
(2) by the filtration of material after reaction, 60 DEG C of filter cake drying, grinding to get the sulfydryl swelling material.
Correspondingly, a kind of method for improving soil using the soil composite passivant, by the soil composite passivant
By the 200~500kg/ mus of shallow-layers that are manured into soil, mix well with the soil, water spray make soil moisture content reach saturation moisture capacity 60~
70%；7~15d is kept, then is sowed or transplanted seedling.
The invention has the following advantages:
1, the present invention provides a kind of soil passivator, the core component of the passivator is specific pseudomonad and its training
Support object；And the application method of the soil passivator is provided simultaneously.Using the soil passivator, plant growth can be effectively facilitated.
2, simultaneously, applicant is also based on the soil passivator and further provides a kind of soil composite passivant, the soil
Earth composite passivant both can be heavy metal-passivated, reduces the biological effectiveness of heavy metal, reduces absorption of the crop to heavy metal,
Promote the growth of plant；Except the heavy metal for having the function of being passivated in soil, the soil composite passivant also has heavy metal
There is barrier action, can effectively prevent absorption of the plant to metal Cd, to reduce the residual of heavy metal in crops.
3, the present invention is based on soil composite passivants, additionally provide a kind of side for promoting plant growth, improving soil quality
Method.Can be effectively improved soil application it is excessive caused by it is hardened situations such as, and plant growth is good, is not easy to obtain pest and disease damage, can be
Heavy-metal residual crop up to standard is planted out in heavy metal pollution soil.
Specific embodiment
One, the present invention provides a kind of soil passivator and preparation method thereof.
The soil passivator is a kind of microbial bacterial agent, and principle active component therein is pseudomonad
(Pseudomonas alcaliphila sp.) MBR is preserved in Chinese microorganism strain preservation management committee on January 2nd, 2008
Member's meeting common micro-organisms collection (abbreviation CGMCC)；Deposit number is CGMCC No.2318.The bacterium is in the first of applicant
Apply in a pseudomonas and its purposes (Authorization Notice No.: 101531970 B of CN) in biological reducing and biological adsorption
It is open.
The soil passivator is mainly the mixing that the pseudomonad is expanded to the thallus and culture medium that obtain after culture
Object；Viable count >=1.0 × 10 in the soil passivator9cfu/ml.It should be understood that obtaining the mixed of thallus and culture medium
After closing object, mixture can also be further processed into freeze-dried vaccine powder, the freeze-dried vaccine powder can also be directly as soil passivator
It uses.
One of method for obtaining soil passivator is described below.
1, the recovery and activation of strain: the pseudomonad is inoculated into culture medium, and 25~30 DEG C of cultures 16~24 are small
When make actication of culture, be transferred in new culture medium according still further to 1%~5% inoculum concentration, 25~30 DEG C cultivate 16~24 hours,
Obtain seed liquor.
Wherein, the formula of the culture medium are as follows: KNO31.0g, KH2PO41.0g, MgSO4·7H2O 1.0g, FeCl3·
6H2O 0.05g, CaCl2·2H2O 0.2g, trisodium citrate 5.13g, distilled water 1000ml.
2, it prepares soil passivator: the seed liquor (is included into culture according to 1%~5% inoculum concentration access fermentor
Base) in expand culture, cultivate 16~24 hours under the conditions of 25~30 DEG C, acquisition bacteria suspension, which is required soil
Earth passivator.In the soil passivator, pseudomonad viable count >=1.0 × 109cfu/ml。
Can also be as needed, the bacteria suspension is further made as freeze-dried vaccine powder, the bacterium powder can also be separately as soil
Earth passivator uses.Specific production method are as follows: the protective agent that quality is bacteria suspension total amount 2%~5% is added in bacteria suspension, mixes
Even, freeze-drying, obtains bacterium powder.Wherein, the protective agent is skimmed milk power, starch, glycerol, sucrose, appointing in sodium alginate
The combination for one or more of anticipating.
Two, the present invention also provides the application methods of the soil passivator.
If the soil passivator is bacteria suspension, being diluted to viable count is 1.0 × 109Carried out after cfu/ml using；
If soil passivator is the bacterium powder of freeze-drying, and bacterium powder is soluble in water, until viable count is 1.0 × 109The laggard enforcement of cfu/ml
With.
Before sowing or transplanting seedling, immersion treatment is carried out to seed or seedling using the soil passivator.If it is
Seed, then soil passivator need to all submerge seed, impregnate 10~60min；If it is seedling, then soil passivator need to will be young
Seedling root system all submerges, and impregnates 5~30min.After sowing or transplanting, moisture is replenished in time.
Preferred scheme are as follows: after planting plants, be again directly sprayed on soil passivator around plant rhizosphere
(150 liter/mu) directly improves the ability of plant disease-proof evil and utilizes nitrogenous fertilizer to guarantee that pseudomonad colonizes in plant rhizosphere
Ability.
Three, the present invention also provides a kind of soil prepared using the soil passivator and deactivation of support material is compound blunt
Agent.
The soil passivator is made after compounding with deactivation of support material (calcium citrate iron-based material and sulfydryl swelling material)
At the soil composite passivant with nutrition slow-release effect.Specific preparation method includes the following steps:
1, the preparation of calcium citrate iron-based material
(1) ferrous sulfate heptahydrate is uniformly mixed with natrium carbonicum calcinatum and citric acid according to molar ratio 1:1:1, uses hydroxide
It is 7.0~8.0 that sodium or calcium oxide, which adjust pH, obtains substance A.
(2) citric acid is mixed with calcium oxide according to molar ratio 2:3, adjusting pH with sodium hydroxide is 7.0~8.0, washing,
White depositions B is obtained after filtering.
(3) in mass ratio it is 1:1~4 by step (1) substance A and step (2) described sediment B, is uniformly mixed, does
It is dry to obtain calcium citrate iron-based material.
2, the preparation of sulfydryl swelling material
(1) cysteine hydrochloride and bentonite mixed according to mass ratio 1:20~50, add suitable quantity of water that suspension is made,
It is stirred 3~5 hours on blender.It should be understood that herein plus the purpose of water be only that convenient for by cysteine hydrochloride and
Bentonite mixes, therefore, as long as amount of water is able to satisfy mixing demand.
(2) then with sodium hydroxide tune pH be 8.0~8.5.
(3) material after reaction is obtained into powdered sulfydryl through 60 DEG C of drying, grinding by obtaining filter cake, filter cake after filtering
Swelling material.
3, the preparation of deactivation of support material
Calcium citrate iron-based material is uniformly mixed with sulfydryl swelling material 1:1~3 in mass ratio, obtains deactivation of support material
Material.
4, the preparation of soil composite passivant
It with the carrier material is in mass ratio that 1:10~50 are uniformly mixed by the soil passivator.Natural air drying, i.e.,
Obtain the soil composite passivant.It should be understood that soil passivator either bacteria suspension or freeze-dried vaccine powder herein,
It is used after can directly being mixed according to the above ratio with carrier material.
Four, the present invention also provides a kind of application methods of soil composite passivant.
Specifically comprise the following steps:
In the ditching of agricultural land soil shallow-layer or nest, the soil composite passivant is applied in cadmium pollution soil, it is mixed with soil
It is even, watering to the 60% of water-retaining quantity among field of soil.After keeping 7~15d, seedling is then sowed or transplanted.
Preferred scheme are as follows: if farmland is paddy field, directly uniformly sprinkled soil composite passivant in paddy field
It spills, amount of application is 200~500kg/ mus, 1~3cm of waterflooding, is planted again after keeping 7~15d.If farmland is nonirrigated farmland,
Apply passivator using the mode of sprinkling, is then turned over and poured water；When pouring water soil reach field capacity 60~
70%, it is planted again after being kept for 7~15 days.
It should be understood that above-mentioned soil passivator and soil composite passivant can be used in combination.That is, before planting,
First seedling or seed are pre-processed using soil passivator；After being handled using soil composite passivant farmland again into
Row plantation；After plantation, reuses soil passivator and plant is handled.
Combined with specific embodiments below, the present invention is further elaborated.
Embodiment one: the preparation of soil passivator
The pseudomonad is inoculated into culture medium, medium component are as follows: KNO31.0g, KH2PO41.0g
MgSO4·7H2O 1.0g, FeCl3·6H2O 0.05g, CaCl2·2H2O 0.2g, trisodium citrate 5.13g, distilled water
1000ml。
Make actication of culture by 30 DEG C, 150rpm shaking table culture 24 hours.New culture is transferred to by 1% inoculum concentration again
In base, 30 DEG C are further cultured for 24 hours, obtain seed liquor.
By the seed liquor according to culture is expanded in 1% inoculum concentration access fermentor (including new culture medium), 28
It is cultivated 16 hours under the conditions of DEG C, collects gained bacteria suspension, as soil passivator.
Embodiment two: the application of soil passivator (effect that soil passivator improves cadmium pollution water quality water planting wheat is shown)
Using the culture solution for being added to heavy metal Cd (5mg/L) as matrix, Greenhouse Water Culture test is carried out.By wheat seed clear
After germination shows money or valuables one carries unintentionally in water, chooses normal, the inapparent seed of group difference that germinates and be placed in the germination basket for colonizing cotton, then
Cotton will be colonized to be immersed in the culture solution containing heavy metal Cd, soil passivator prepared by 1% embodiment one is accessed, as experiment
Group；Simultaneously not add soil passivator as control group, each experimental group sets 4 repetitions；It is clear with the Cd containing 5mg/L simultaneously
Water, as blank group.Hot-house culture condition be 12 hours daytimes, night 12 hours, relative humidity 80%.Wheat is collected after 30 days
Plant carries out indices analysis.Cd content is as shown in table 1 in specific disposition and rhizome.
1 each group effect of table shows table
It is found after culture in 10 days, the wheat of blank group is inhibited slow growth by cadmium, or even occurs dormant existing
As.It is inoculated with the bacterial strain well developed root system of soil passivator, growth detects the Cd content in rhizome, experimental group rhizome quickly, after 20 days
In the extremely significant reduction of Cd.Illustrate in water planting, soil passivator has the effect of that splendid barrier wheat absorbs heavy metal.
Embodiment three: the preparation of soil composite passivant
1, the preparation of calcium citrate iron-based material.By ferrous sulfate, natrium carbonicum calcinatum, citric acid according to molar ratio 1:1:1
It is 8.0 to get substance A that uniformly mixed sodium hydroxide or calcium oxide, which adjust pH,；Citric acid and calcium oxide are mixed according to molar ratio 2:3
It closes, adjusting pH with sodium hydroxide is 8.0, washes, white depositions B is obtained by filtration.By the substance of the B of above-mentioned steps 2 and step 1
A is uniformly mixed, drying to obtain calcium citrate iron-based material according to mass ratio 2:1.
2, the preparation of sulfydryl swelling material.By cysteine hydrochloride and bentonite is mixed according to mass ratio 1:30 plus water
Suspension is made, is stirred 5 hours on blender.After reaction 5 hours, with sodium hydroxide tune pH to 8.0.Filter to obtain filter cake, 60 DEG C
Drying, grinding, obtain powdered sulfydryl swelling material.
3, the preparation of deactivation of support material.Calcium citrate iron-based material is mixed with sulfydryl swelling material 1:3 in mass ratio
Uniformly, deactivation of support material is obtained.
4, the preparation of composite passivant.The soil passivator prepared by embodiment one is pressed with the deactivation of support material
Natural air drying, as soil composite passivant are uniformly mixed according to mass ratio 1:35.
Example IV: the application of soil composite passivant (for the potted plant experiment of rice)
The potted plant experiment of soil remediation is carried out using the serious cadmium pollution rice soil in Sichuan somewhere as matrix.Contaminated soil acquires simultaneously
Naturally dry is crushed, and removes stone and plant roots etc., is crossed the sieve of 60 mesh, is divided in the beaker of 2L, and each beaker fills soil
2kg.Experimental setup 3 processing, 3 repetitions of each processing.The sample that soil composite passivant is prepared using embodiment three.Specifically
Experimental setup is as follows: processing 1: soil composite passivant 4g/kg；Processing 2: soil composite passivant 6g/kg；Processing 3: soil is multiple
Passivator 8g/kg is closed, blank control is done with soil without any processing.Each processing addition equivalent is compound with N, P of kind
Fertilizer (is purchased from Sichuan Hongda Co., Ltd.).Each processing is uniformly mixed after applying soil composite passivant, and carries out waterflooding,
7d is maintained, takes pedotheque, and pass through the content detection soil available Cd such as spontaneously dry, be ground up, sieved.Then it plants
Rice seedling is grown under field conditions (factors).And in harvest time (after 127d), in the root, cauline leaf, rice that measure each group rice respectively
Cadmium content；Every group in triplicate, is averaged.The results are shown in Table 2, and each group of data unit is mg/kg.
2 each group effect of table shows table
As can be seen from the above table, compared with blank control, soil composite passivant has soil available Cd obvious
Passivation effect.With the increase of dosage, passivation effect is more significant, when dosage is 6g/kg, compared with 8g/kg, and difference
It is not significant.To sum up, compared with the control group, using soil composite passivant provided by the invention, soil available cadmium can be made to contain
Amount reduces by 54.25~63.68%；Minimum 0.64~the 0.78mg/kg of cadmium content in rice, rice Cd content reduces 78~
82%.
Embodiment five: the application of soil composite passivant (for the potted plant experiment of wheat)
Cadmium pollution soil fills the same example IV of processing before basin.Soil by screening is packed into the burning of 2L according to 1.5kg/ basin
In cup, keeping the skin wet makes in beaker moisture content 10~20%.Then the soil of each beaker addition different quality is compound blunt
Agent；It is uniformly mixed.Wheat 5 are sowed in each beaker again.It is divided into 3 processing: processing 1 are as follows: soil composite passivant 4g/
kg；Processing 2 are as follows: soil composite passivant 6g/kg；Processing 3: soil composite passivant 8g/kg, with soil without any processing
Do blank control.N, P compound fertilizer are added in each processing；It is grown under natural conditions.It is received from sowing in 2018.12 months to 2019.5 months
It obtains, by the growth of 5 wheat harvesting periods, measures the cadmium content in the root, cauline leaf, wheat flour of each group wheat respectively in harvest time；Often
Group in triplicate, is averaged.Pedotheque is taken, and passes through and spontaneously dries, is ground up, sieved etc. detection soil available Cd's
Content.The results are shown in Table 3, and each group of data unit is mg/kg.
3 each group effect of table shows table
From Table 2, it can be seen that soil composite passivant is decreased obviously the passivation efficiency of dryland soil.Deactivation rate is 20
Between~32%.With the increase of dosage, deactivation rate is increased slightly.Compared with the control group, Cd in wheat rhizome and flour
Concentration significantly reduces, and total Cd content reduces 51%~75% in root；Total Cd reduces 66%~73% in cauline leaf；In wheat flour
Total Cd reduces 59%~69%.Although the passivation effect of soil composite passivant in the soil is not high, but still there is barrier weight
The effect that metal absorbs in wheat.
Claims (9)
1. a kind of soil passivator, it is characterised in that: the soil passivator is a kind of microbial bacterial agent, the soil passivator
In, viable count >=1.0 × 10 of the pseudomonad9Cfu/ml or >=1.0 × 109cfu/g；
The pseudomonad is preserved in China Committee for Culture Collection of Microorganisms's common micro-organisms guarantor on January 2nd, 2008
Hiding center, deposit number are CGMCC No.2318.
2. the preparation method of soil passivator described in claim 1, it is characterised in that: described method includes following steps:
(1) recovery and activation of strain: the pseudomonad is inoculated into culture medium, and 25~30 DEG C of cultures make for 16~24 hours
Actication of culture is transferred in new culture medium according still further to 1%~5% inoculum concentration, and 25~30 DEG C are cultivated 16~24 hours, is obtained
Seed liquor；
Wherein, the formula of the culture medium are as follows: KNO31.0g, KH2PO41.0g, MgSO47H2O 1.0g, FeCl3·6H2O
0.05g, CaCl2·2H2O 0.2g, trisodium citrate 5.13g, distilled water 1000ml；
(2) seed liquor is accessed according to 1%~5% inoculum concentration and expands culture in new culture medium, obtain bacteria suspension, i.e.,
For required soil passivator.
3. the preparation method of soil passivator according to claim 2, it is characterised in that: after obtaining the bacteria suspension, then
The protective agent that quality is bacteria suspension total amount 2%~5% is added in bacteria suspension, after mixing, freeze-drying obtains bacterium powder, which is
Required soil passivator.
4. the application method of soil passivator described in claim 2, it is characterised in that: before plantation, use the soil passivator
Immersion treatment is carried out to seed, or leaching root processing is carried out to seedling；After plantation, using the soil passivator to plant rhizosphere week
It encloses or plants and carry out spraying processing around seed.
5. utilizing the soil composite passivant of the preparation of soil passivator described in claim 2, it is characterised in that: the soil is compound
Passivating agent composition includes: soil passivator, deactivation of support material；
The deactivation of support material includes at least calcium citrate iron-based material and sulfydryl swelling material；The iron-based material of calcium citrate
Material includes at least calcium citrate and iron containing compounds.
6. the preparation method of soil composite passivant described in claim 5, it is characterised in that: described method includes following steps:
(1) the calcium citrate iron-based material is uniformly mixed with sulfydryl swelling material 1:1~3 in mass ratio, is obtained described
Deactivation of support material；
It (2) is that 1:10~50 are uniformly mixed according to mass ratio with the deactivation of support material by the soil passivator；Then certainly
So air-dry to get the soil composite passivant.
7. the preparation method of soil composite passivant according to claim 6, it is characterised in that: the iron-based material of calcium citrate
The preparation method of material includes the following steps:
(1) ferrous sulfate: natrium carbonicum calcinatum: 1:1:1 is mixed citric acid in molar ratio, and adjusting pH is 7.0~8.0, obtains substance
A；
(2) citric acid is mixed with calcium oxide according to molar ratio 2:3, adjusting pH is 7.0~8.0, washes, filters to obtain sediment B；
(3) step (1) substance A and step (2) described sediment B are the mixing of 1:1~4, are drying to obtain in mass ratio.
8. soil composite passivant according to claim 6, it is characterised in that: the preparation method of the sulfydryl swelling material
Include the following steps:
(1) cysteine salt and bentonite are mixed according to mass ratio 1:20~50, add water that suspension is made, adjust pH be 8.0~
8.5；
(2) material after reaction is centrifuged, goes supernatant, drying, grinding to get the sulfydryl swelling material.
9. a kind of method for being improved soil using soil composite passivant described in claim 5~8 any one, feature are existed
In: the soil composite passivant is manured into soil shallow-layer, is mixed well withed the soil, water spray makes soil moisture content reach saturation moisture capacity
60%；7~15d is kept, then is sowed or transplanted seedling.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113732052A (en) * | 2021-09-27 | 2021-12-03 | 中科云恒(成都)环境科技有限公司 | Pseudomonas soil remediation agent and application thereof in remediation of heavy metal contaminated soil |
| CN115722185A (en) * | 2022-11-10 | 2023-03-03 | 贵州师范大学 | Sulfydryl-iron-based composite modified bentonite for cadmium removal and preparation method thereof |
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