CN106694545A - Method for restoring heavy metal Cu-contaminated soil - Google Patents
Method for restoring heavy metal Cu-contaminated soil Download PDFInfo
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- CN106694545A CN106694545A CN201611142748.0A CN201611142748A CN106694545A CN 106694545 A CN106694545 A CN 106694545A CN 201611142748 A CN201611142748 A CN 201611142748A CN 106694545 A CN106694545 A CN 106694545A
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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
- B09C1/105—Reclamation of contaminated soil microbiologically, biologically or by using enzymes using fungi or plants
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Abstract
The invention relates to the technical field of soil recovery, in particular to a method for restoring heavy metal Cu-contaminated soil. By adding plant hormones IAA to the soil, the heavy metal Cu in the soil is removed through a plant restoration mode. The IAA treatment can remarkably prompt growth and development of plants, effectively relieve the stress effect of Cu in the soil on the plants, and remarkably increase the Cu content of the aboveground parts of the plants, the Cu content is increased by 29.47% averagely compared with check treatment, and therefore, the IAA, as an external additive, can effectively improve the restoration efficiency of the Cu-contaminated soil through Leersia hexandra swartz.
Description
Technical field
The present invention relates to technical field of soil remediation, more particularly to phytoremediation heavy metal Cu contaminated soil method.
Background technology
Phytoremediation, i.e., can be removed using plant, alleviated or fixation is difficult to the function of pollutant degraded, be made contaminated
The technology that soil or water body are purified.Plant extract is the huge sum of money in secretion complexing soil or water body using root system of plant
The pollutants such as category, are transported to the stem and leaf of plant, finally by collecting the aerial part that have accumulated the pollutants such as heavy metal,
Reach the purpose of pollutant in removal soil or water body.The biomass size and aerial part content of beary metal of aboveground vegetation part
Height be influence phytoremediation efficiency two key factors, it has been reported that, in Phytoremediation of Soils Contaminated by Heavy Metals mistake
Cheng Zhong, can improve the adsorbance of plant heavy metal by adjusting soil pH or the lifting soil moisture.In heavy metal pollution
Applying nitrogenous fertilizer in soil can lift the efficiency of phytoremediation, because nitrogenous fertilizer can promote the growth of plant and improve in plant
The content of protein, both both contribute to alleviate the toxic action of heavy metal on plants.But in the soil liquid, however it remains
The bioavilability of most of heavy metal problem not high.
The content of the invention
For problems of the prior art, the present invention provides a kind of method of remediating heavy metal Cu contaminated soils, profit
Strengthen the bioavilability of plant heavy metal Cu with plant hormone, so that the heavy metal Cu pollution in more effective rehabilitating soil.
Specific technical scheme is as follows：
The present invention includes application of the heteroauxin as phytoremediation accelerator in heavy metal Cu contaminated soil.
A kind of method of remediating heavy metal Cu contaminated soils, to plant hormone IAA is added in soil, using phytoremediation
Heavy metal Cu in mode rehabilitating soil.
The method of above-mentioned remediating heavy metal Cu contaminated soils, preferably includes following steps：In heavy metal Cu contaminated soil
Middle planting plants, to plant hormone IAA is added in soil, harvest plant so as to heavy metal Cu in rehabilitating soil.
Wherein, the plant hormone IAA of addition is preferably IAA solution, makes its concentration in soil be 5~20mmol
kg-1, preferably 8~17mmolkg-1, more preferably 10~15mmolkg-1。
The present invention does not limit the time of addition plant hormone IAA, can be added in the whole growth period of plant.In order to
Ensure the effect of remediating heavy metal Cu contaminated soils, the preferably physiological function stationary phase in plant adds, 20~100 after being such as colonized
My god, preferably 30~50 days.
The plant for being used for heavy metal Cu in rehabilitating soil in the present invention is preferably super enriching plant, such as vetiver, ciliate desert-grass,
Squama sedge, Indian mustard etc. have the effect of super enrichment to heavy metal in soil.
The plant for being used for heavy metal Cu in rehabilitating soil in the present invention can also use common plant.In the embodiment of the present invention
Using Leersia Sw, by adding plant hormone IAA, promote the reparation of plant heavy metal Cu contaminated soils.
Preferably, plant plantation to before in contaminated soil, it is necessary to preculture.It is preferred that in the last 1/2 as shown in table 1
Preculture is carried out in the improvement Hoagland nutrient solutions of degree.Pre-incubation time is 1~3 week, preferably 2 weeks.
The reparation of method of the present invention low degree Cu-W ore deposit farming land soil suitable for 100-300mg/kg.
Compared with prior art, the advantage of the invention is that：
The method of the remediating heavy metal Cu contaminated soils that the present invention is provided, by addition chelating agent EDTA in soil and plant
Thing hormone IAA, using heavy metal Cu in rehabilitating soil by the way of phytoremediation.Experiment shows in 100mgkg-1Under Cu stress,
IAA treatment significantly promotes growing for Leersia Sw, compared with control treatment, IAA treatment be obviously promoted Leersia Sw to
Upper growth.IAA treatment also effectively alleviates coercions of the soil Cu to Leersia Sw, and is a significant increase Leersia Sw on the ground
The content of part Cu, therefore, IAA can effectively improve remediation efficiency of the Leersia Sw to Cu contaminated soils as outer source additive.
Brief description of the drawings
The present invention will be further described below in conjunction with the accompanying drawings.
Fig. 1：Influence of the copper Plant Under The Stress hormone to Leersia Sw plant height；
Fig. 2：Influence of the copper Plant Under The Stress hormone to Leersia Sw dry weight；
Fig. 3：Influence of the copper Plant Under The Stress hormone to Leersia Sw root dry weight；
Fig. 4：Influence of the copper Plant Under The Stress HORMONE TREATMENT to Leersia Sw aerial part Cu contents；
Fig. 5：Influence of the copper Plant Under The Stress HORMONE TREATMENT to Leersia Sw root Cu contents；
Fig. 6：Copper is coerced with Leersia Sw under Plant hormone treatment to the bio-concentration factor of Cu and transhipment coefficient.
Specific embodiment
Below in conjunction with the embodiment in the present invention, the technical scheme in the embodiment of the present invention is carried out clearly and completely
Description, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.Based on this hair
Embodiment in bright, the every other implementation that those of ordinary skill in the art are obtained under the premise of creative work is not made
Example, belongs to the scope of protection of the invention.
Embodiment 1：
1 experimental technique
The culture of 1.1 plants
Leersia Sw used by this experiment picks up from the balk in Guilin City Yan Shan towns, and does not receive heavy metal pollution.After collection
Leersia Sw rinses plant repeatedly with running water first, is rinsed well until the soil on surface, then with ultrapure water 3 times, so
Leersia Sw is loaded in units of 20~30 plants afterwards the circle of improvement Hoagland nutrient solutions (formula is shown in Table 1) for filling with 1/2 intensity
Lucifuge is done with black plastic bag to process, experiment knot is influenceed with the generation for preventing algae substances in cylindricality vial, around vial
Really, finally the vial equipped with Leersia Sw is neatly placed in growth cabinet (LRH-500-GSI) and is cultivated.By setting people
The parameters of work climate box, control the growth conditions of Leersia Sw.Subtracted because of evaporation to supplement by 2 ultra-pure waters of addition daily
Few moisture, one time of nutrition liquid is changed per 4d, and be 0.1mmolL with concentration-1NaOH or 0.1mmolL-1HCl is by nutrition
The pH of liquid is controlled in 5.5 or so, preculture two weeks.
Table 1 improves Gram nutrient solution prescription suddenly
1.2 potted plant experiment physiochemical properties of soil
Soil used by potted plant experiment picks up from Guilin University of Technology Yan Shan school districts, and the content of Copper In The Soil is after testing
3.829mg·kg-1, according to《Standard of soil environment quality GB 15618-1995》Regulation, perform secondary standard II class soil
Earth, Copper In The Soil content need to be not more than 50mgkg-1(pH ＜ 6.5), potted plant experiment soil other basic physical and chemicals such as table 2.
The potted plant experiment physiochemical properties of soil of table 2
1.3 plant hormones cooperate with chelating agent as the experiment of outer source additive
Experiment is carried out in warmhouse booth, 25/20 DEG C of temperature.Potted plant experiment soil in 1.2 is carried out into Cu treatment, at Cu
Reason concentration is 100mgkg-1.The Leersia Sw of preculture in 1.1 is transplanted in the soil after Cu treatment, is poured daily sooner or later
A deionized water is respectively poured, soil water amount is kept.Plant to be planted growth characters function is more stable, is added respectively by mark
EDTA, NTA and IAA solution, this experiment after plant transplantation 50d, in soil add EDTA, NTA and IAA solution.Chelating agent
EDTA, NTA treating capacity are 5mmolkg-1, plant hormone IAA treating capacities are 10mgkg-1, experiment 6 treatment altogether, often
Individual treatment is repeated 3 times, and is designated as respectively：CK (does not apply chelating agent and IAA)；IAA (applies IAA)；EDTA (applies EDTA)；
EDTA＆IAA (while applying EDTA and IAA)；NTA (applies NTA)；NTA＆IAA (while applying NTA and IAA).Harvested after 10d
Plant, determines the content of biomass and Cu.
The processing mode of the outer source additive of table 3
1.4 determine project and method
1.4.1 heavy metal Cu contaminated soil assay：The soil sample 0.2g for weighing 100 mesh sieves is put into conical flask, plus
Enter 10mL HNO3, cover bending funnel and stand overnight, High-temperature Digestion is carried out every other day, take out taper when High-temperature Digestion is to 1~2mL
Bottle, continues to clear up after adding 4mL hydrogen peroxide after cooling, when the 2nd time plus hydrogen peroxide are cleared up to 1mL or so, clears up end.This
Digestive juice is moved to afterwards in the colorimetric cylinder of 25mL, the number of times of pipetting processes ultrapure water conical flask inwall is no less than 3 times, will rush
After washing lotion is transferred in colorimetric cylinder in the lump, then 25mL is settled to ultra-pure water, is finally surveyed with atomic absorption spectrophotometry
Determine the copper content in soil.
1.4.2 the measure of plant biological index：Root, stem, leaf are pressed after plant harvest separate, rinse plant with running water first
The soil of remained on surface, then adds 10mmolL in ultrasonic washing instrument-1EDTA-Na2To clean absorption in root system of plant
The Cu on surface, is repeated 3 times (10min/ times).The plant cleaned after 3 times is rinsed one time in being put into the basin for fill deionized water
The water of plant surface is blotted with blotting paper afterwards, baking oven is finally putting into, temperature is adjusted to 105 DEG C of de-enzyme 30min, and de-enzyme is finished temperature
Degree is adjusted to 80 DEG C, is taken out when plant is dried to weight after a few days and it is weighed and is counted.
1.4.3 plant content of beary metal is determined：The root of about 0.3g plants, stem, leaf is weighed to be put into clean conical flask, plus
Enter 10mL HNO3, cover bending funnel and stand overnight, High-temperature Digestion is carried out every other day, take out taper when High-temperature Digestion is to 1~2mL
Bottle, continues to clear up after adding 4mL hydrogen peroxide after cooling, when the 2nd time plus hydrogen peroxide are cleared up to 1mL or so, clears up end.This
Digestive juice is moved to afterwards in the colorimetric cylinder of 25mL, the number of times of pipetting processes ultrapure water conical flask inwall is no less than 3 times, will rush
After washing lotion is transferred in colorimetric cylinder in the lump, then 25mL is settled to ultra-pure water, is finally surveyed with atomic absorption spectrophotometry
It is colonized the copper content of thing.
Experiment the data obtained, continuous harvesting are represented using three arithmetic mean of instantaneous values ± standard deviation (SD) of Duplicate Samples measured value
Statistical check (ɑ=0.05) is carried out with two-way analysis of variance on the data in Leersia Sw rehabilitating soil Cu pollution efficiency influences.
The pollution amelioration efficiency of soil Cu can be evaluated with clearance or remediation efficiency.
2 results and analysis
The influence that 2.1 plant hormones collaboration chelating agent pollutes to Leersia Sw rehabilitating soil Cu
As shown in Figure 1, in 100mgkg-1Under Cu stress, using plant hormone (IAA), chelating agent EDTA and plant hormone
The Leersia Sw plant height of collaboration chelating agent EDTA (E＆I) treatment is significantly higher than control group.Under identical Plant hormone treatment, using IAA
It is significantly higher than with the Leersia Sw plant height of E＆I treatment and cooperates with chelating agent NTA (N＆I) treatment group using plant hormone.Using N＆I treatment
Plant height be not significantly different from compared to control group, and be administered alone chelating agent NTA treatment plant height substantially less than control group.With
Do not compared with the control treatment of chelating agent using plant hormone, IAA, EDTA and E＆I treatment have been obviously promoted the upward of Leersia Sw
Growth, increased 16.25%, 18.73% and 17.23% than control group respectively.
As shown in Figure 2, compared with not using the control treatment of plant hormone and chelating agent, IAA and EDTA treatment makes Li Shi
Standing grain dry weight substantially increases, and increased 72.18% and 61.48% than control respectively.In addition, between other treatment and control treatment
It is not significantly different from.The influence of chelating agent treatment shows as：Under different chelating agent treatment, EDTA is processed apparently higher than NTA treatment.
From the figure 3, it may be seen that plant hormone collaboration chelating agent treatment promotes the growth of Leersia Sw root system, particularly IAA and
EDTA treatment the most substantially, 23.46% He is increased compared with not using the control treatment of plant hormone and chelating agent respectively
70.47%.Other treatment such as NTA and N＆I treatment is above control, and E＆I treatment is less than between control, but treatment all without significance difference
It is different.
Fig. 4 indicates influence of the copper Plant Under The Stress hormone collaboration chelating agent treatment to Leersia Sw aerial part Cu contents,
As can be seen that in 100mgkg-1Under Cu stress, plant hormone collaboration chelating agent treatment each contributes to improve Leersia Sw overground part
Cu contents, but improving the standard for variety classes treatment is different, and preferable IAA, EDTA and N＆I treatment of effect makes Leersia Sw
Aerial part Cu contents are by the 182.92mgkg that compares-1It is respectively increased 223.03mgkg-1、250.60mg·kg-1With
239.56mg·kg-1, increase rate respectively reaches 21.93%, 37.00% and 30.97%.
As seen from Figure 5, in 100mgkg-1Under copper concentration stress, effectively improved using IAA, EDTA and N＆I treatment
The Cu contents of Leersia Sw root, make the Cu contents of Leersia Sw root from the 608.88mgkg of control treatment respectively-1It is promoted to
702.47mg·kg-1、875.21mg·kg-1And 721.20mgkg-1, increase rate is respectively up to 15.37%, 43.74% and
18.47%.
As seen from Figure 6, in the case where the outer source additive of difference is individually or jointly processed, concentration coefficient of the Leersia Sw to Cu
There is different degrees of raising.In 100mgkg-1Under copper concentration stress, using the treatment of IAA, EDTA and E＆I apparently higher than administration
The treatment of NTA and N＆I, compared with control group, concentration coefficient improves 48.96%, 58.26% and 54.85% respectively.
2.2 analyses
Heteroauxin (IAA), can stimulate the growth of foot end and aerial part during as auxin low concentration,
EDTA and NTA can be activated effectively and complexing heavy metal as chelating agent, promote the absorption of plant heavy metal.In the present invention,
In 100mgkg-1Under Cu stress, IAA treatment significantly promotes growing for Leersia Sw, and compared with control treatment, IAA is obvious
Growing up for Leersia Sw is promoted, 16.25% is increased than control treatment respectively.IAA treatment also effectively alleviates soil
Cu is a significant increase the content of Leersia Sw aerial part Cu to the coercion of Leersia Sw, averagely increases than control treatment
29.47%, therefore, IAA can effectively improve remediation efficiency of the Leersia Sw to Cu contaminated soils as outer source additive.
It can be that professional and technical personnel in the field realize or use that above-mentioned implementation method is intended to illustrate the present invention, to above-mentioned
Implementation method is modified and will be apparent for those skilled in the art, therefore the present invention is included but is not limited to
Above-mentioned implementation method, it is any to meet the claims or specification description, meet with principles disclosed herein and novelty,
The method of inventive features, technique, product, each fall within protection scope of the present invention.
Claims (8)
1. application of the heteroauxin as phytoremediation accelerator in heavy metal Cu contaminated soil.
2. a kind of method of remediating heavy metal Cu contaminated soils, it is characterised in that to heteroauxin is added in soil, using plant
Heavy metal Cu in the mode rehabilitating soil of reparation.
3. method according to claim 2, it is characterised in that comprise the following steps：In heavy metal Cu contaminated soil
Planting plants, to heteroauxin is added in soil, harvest plant so as to heavy metal Cu in rehabilitating soil.
4. according to the method in claim 2 or 3, it is characterised in that concentration of the IAA in soil be 5~
20mmol·kg-1。
5. according to the method in claim 2 or 3, it is characterised in that the plant is super enriching plant.
6. method according to claim 5, it is characterised in that the super enriching plant is vetiver, ciliate desert-grass, squama sedge
Or Indian mustard.
7. according to the method in claim 2 or 3, it is characterised in that the plant is Leersia Sw.
8. according to the method in claim 2 or 3, it is characterised in that the soil is low degree copper in 100-300mg/kg
Contaminated soil.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108693016A (en) * | 2018-04-24 | 2018-10-23 | 广东省农业科学院农产品公共监测中心 | A kind of pre-treating method for the detection of batch heavy metal in soil |
| CN108704928A (en) * | 2018-05-21 | 2018-10-26 | 中南民族大学 | It is a kind of to improve composite drug and its preparation method and application of the plant to Metal uptake turn-over capacity |
| CN108906864A (en) * | 2016-11-07 | 2018-11-30 | 保定学院 | A method of Copper Mine Abandoned Place heavy metal pollution of soil is repaired using plant cultivating mode |
| CN108941190A (en) * | 2018-06-29 | 2018-12-07 | 浙江九达环保设备有限公司 | Multiple green restorative procedure is isolated in contaminated soil sealing |
| CN111633025A (en) * | 2020-04-24 | 2020-09-08 | 长江大学 | Method for strengthening phytoremediation of cadmium-contaminated soil by using root exudates |
| CN112427454A (en) * | 2020-12-04 | 2021-03-02 | 榕知(杭州)信息技术有限公司 | Microbial preparation for repairing heavy metal contaminated soil and preparation method thereof |
| CN115231709A (en) * | 2022-07-20 | 2022-10-25 | 桂林电子科技大学 | Application of iron film in improving super-enriched plant Leersia hexandra Swartz in restoring heavy metal chromium polluted water body |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108906864A (en) * | 2016-11-07 | 2018-11-30 | 保定学院 | A method of Copper Mine Abandoned Place heavy metal pollution of soil is repaired using plant cultivating mode |
| CN108906864B (en) * | 2016-11-07 | 2021-02-02 | 保定学院 | Method for repairing heavy metal pollution of copper ore waste land soil by adopting plant cultivation mode |
| CN108693016A (en) * | 2018-04-24 | 2018-10-23 | 广东省农业科学院农产品公共监测中心 | A kind of pre-treating method for the detection of batch heavy metal in soil |
| CN108704928A (en) * | 2018-05-21 | 2018-10-26 | 中南民族大学 | It is a kind of to improve composite drug and its preparation method and application of the plant to Metal uptake turn-over capacity |
| CN108704928B (en) * | 2018-05-21 | 2020-09-15 | 中南民族大学 | Composite medicament for improving absorption and transportation capacity of plants to heavy metals and preparation method and application thereof |
| CN108941190A (en) * | 2018-06-29 | 2018-12-07 | 浙江九达环保设备有限公司 | Multiple green restorative procedure is isolated in contaminated soil sealing |
| CN111633025A (en) * | 2020-04-24 | 2020-09-08 | 长江大学 | Method for strengthening phytoremediation of cadmium-contaminated soil by using root exudates |
| CN112427454A (en) * | 2020-12-04 | 2021-03-02 | 榕知(杭州)信息技术有限公司 | Microbial preparation for repairing heavy metal contaminated soil and preparation method thereof |
| CN112427454B (en) * | 2020-12-04 | 2021-09-10 | 德州迈科生物技术有限公司 | Microbial preparation for repairing heavy metal contaminated soil and preparation method thereof |
| CN115231709A (en) * | 2022-07-20 | 2022-10-25 | 桂林电子科技大学 | Application of iron film in improving super-enriched plant Leersia hexandra Swartz in restoring heavy metal chromium polluted water body |
| CN115231709B (en) * | 2022-07-20 | 2024-04-26 | 桂林电子科技大学 | Application of iron film in improving restoration of heavy metal chromium-polluted water body by super-enriched plant Leersia hexandra |
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Application publication date: 20170524 |