CN101745196A

CN101745196A - Formula of Cd metal antidote and preparation method thereof

Info

Publication number: CN101745196A
Application number: CN200810249505A
Authority: CN
Inventors: 庄海燕; 李慧芝
Original assignee: University of Jinan
Current assignee: Jinan University; University of Jinan
Priority date: 2008-12-22
Filing date: 2008-12-22
Publication date: 2010-06-23

Abstract

The invention relates to a formula of a Cd metal antidote and a preparation method thereof, wherein the Cd metal antidote can reduce the content of heavy metals such as cadmium, chrome, mercury and the like in water and soil polluted by heavy metals and can promote the restoration of plants in the polluted soil. The formula of the Cd metal antidote comprises 0.1-0.2 percent of 70 percent phytic acid, 1-3 percent of chitosan, 0.002-0.003 percent of red mud, 0.001 percent of ammonia, 0.01 percent of acetic acid and 97-99 percent of water. The preparation method of the Cd metal antidote comprises the following steps of: (1) weighting 1.4g of 70 percent phytic acid and diluting to 1L to prepare a solution with the mass fraction of 10<-3>, (2) weighting and adding 10g of chitosan into the solution, and adding 1 percent acetic acid till the chitosan is dissolved, (3) adjusting the pH of the solution to 6-7 with ammonia, and (4) adding the red mud according to a standard of 20 mg/kg.

Description

A kind of prescription of Cd metal antidote and compound method thereof

Technical field

The present invention relates to a kind of prescription and compound method thereof of antidote, particularly a kind of content that can reduce heavy metals such as cadmium, chromium, mercury in contaminated by heavy metals water body and the soil, to prescription and the compound method thereof that polluted soil phyto is repaired favorable Cd metal antidote, belong to agricultural and Environmental Technology field.

Background technology

Heavy metal enters soil environment by different approaches, heavy metal in the soil is through complicated physics, chemical reaction, major part is trapped in the soil with various forms, and heavy metal accumulates and enter the food chain circulation at the crop edible part simultaneously, thereby health is constituted a threat to.Utilize chelating agent to promote that common plants enriched absorption heavy metal in soil is a kind of new association of soil recovery technique that developed recently gets up.By in contaminated soil, using chelating agent the metal of solid phase of soil bonding is discharged, increase soil liquid concentration of metal and activity, help metal to root and by plant absorbing.The research of relevant fortification of plants recovery technique is at first by (1974) reports such as Wallace, when they have proposed to use EDTA on heavy-metal contaminated soil and heavy metal form the solubility that complex compound (metal-EDTA) improved heavy metal and promote plant absorbing.Blayllock etc. (1997) has also delivered the viewpoint that EDTA can promote the plant absorbing heavy metal successively afterwards.Artificial heavy-metal contaminated soil and area, mine soil are tried soil as supplying, and EDTA makes complexing agent; Argy wormwood is as test plant, the investigation of carrying out the plant absorbing cadmium shows, using the trial zone of EDTA obviously raises with cadmium content in the argy wormwood body is compared in the contrast of not using EDTA, wherein the uptake of cadmium increases more than 2 times from mine soil, and the uptake of cadmium increases more than 1.5 times in the artificial pollution soil.After using EDTA, the heavy metal recruitment that plant absorbs from artificial pollution soil less than the reason of the heavy metal recruitment that absorbs in the mine soil is: though two district's cadmium concentrations are the same, but the high relatively result of the availability of cadmium in the artificial pollution soil, this phenomenon also is confirmed in other soil cultivations.Agricultural University Of Southwest's Master's thesis has carried out general survey to the research of relevant fortification of plants recovery technique, use anionic surfactant, nonionic surface active agent and intercalating agent EDTA, the reinforcement potherb mustard obtains significant effect to the repairing effect of cadmium pollution soil.But surfactant itself also is a kind of environmental contaminants, to the long-term deep research of still needing of its environmental safety.

There are ethylenediamine triacetic acid (HEDTA), ethylenediamine tetra-acetic acid organic sequestering agents such as (EDTA) to be used to improve the research of plant at present successively to Cd, Pb absorption and accumulation ability.But used chelating agent mostly is the chemical reagent that synthesizes in this class research, toxicity is higher, cost an arm and a leg, and anti-decomposability is strong in natural environment, and the residence time in the soil is long, can cause and use the underground water pollution that the heavy metal solution-off causes behind the chelating agent, cause secondary pollution.

Summary of the invention

The purpose of this invention is to provide a kind of prescription and compound method thereof that can overcome the Cd metal antidote of above-mentioned technical disadvantages.

A kind of Cd metal antidote of the present invention is realized with following recipe ingredient: 70% phytic acid, 0.1～0.2% shitosan 1～3%, red mud 0.002%～0.003%, ammoniacal liquor 0.001%, acetic acid 0.01%, water 97～99%.Phytic acid belongs to the natural biological preparation, and chemical name is an inositol hexaphosphate, i.e. six phosphate ester of cyclohexanhexanol, and molecular formula is C ₆H ₁₈O ₂₄P ₆Be the inositol monophosphate ester admixture, mainly the form with calcium magnesium double salt (phytin, promptly luxuriant and rich with fragrance fourth) is present in vegetable seeds and the plumule thereof, has special physiological properties and chemical property.Easily by plant absorbing, nontoxic and easily biological-degradable, have stronger and ability metallic ion coordination, can form chelate with heavy metal, reparation plays a driving role to polluted soil phyto.Has application widely at aspects such as food, medicine, daily-use chemical industry, metal processing, textile industry, macromolecule industry and plastic processing industry.Owing to have in the phytic acid molecule can be the multiple tooth chelating agent of a kind of rare metal with 6 phosphates of metal cooperation.When it and metal complex, easily form a plurality of chelate rings, formed complex compound stability is extremely strong, even in strong acidic environment, also can form stable complex compound.Just be based on this character, phytic acid can form chelate with cadmium ion, thereby reduces the cadmium content in the environment, restrains the absorption of plant root to cadmium, reduces the murder by poisoning to plant.Shitosan is the deacetylation product of chitin, easily by plant absorbing, nontoxic and easily biological-degradable, has stronger and ability metallic ion coordination, can form chelate with heavy metal, and reparation plays a driving role to polluted soil phyto; The red mud additive has the reduction soil aciditiy, reduces the absorption of plant to cadmium.

A kind of Cd metal antidote of the present invention compound method is as follows:

(1) take by weighing 1.4g 70% phytic acid, be diluted to 1L, making mass fraction is 10 ^-3Solution.

(2) take by weighing 10 gram shitosans in above-mentioned solution, add 1% acetum until dissolving.

(3) regulating pH with ammoniacal liquor is 6～7.

(4) press 20mgkg ^-1Add red mud

The specific embodiment:

Below be one embodiment of the present of invention: take by weighing 1.4g 70% phytic acid, be diluted to 1L, making mass fraction is 10 ^-3Solution, take by weighing 10 gram shitosans again in above-mentioned solution, add 1% acetum to dissolving.Regulating pH with ammoniacal liquor is 6～7, presses 20mgkg ^-1Add red mud, promptly obtain Cd metal antidote of the present invention.

Using method: by native cadmium content (5～20mg/kgCd ²⁺) (0.4～1L) imposes in the soil to add above-mentioned solution.

A kind of Cd metal antidote of the present invention is compared with existing chemical addition agent, and following advantage is arranged: primary raw material phytic acid, the equal degradable of shitosan, and catabolite can activate plant cell, and is very little to groundwater pollution; The red mud additive has the reduction soil aciditiy, reduces plant to the absorption of cadmium, and the nitrogen P elements in the prescription provides nutrition for the growth of plant. Utilize stability, shitosan solubilising and the dispersing characteristic of phytic acid and cadmium chelate, accelerate the flowable of heavy metal in natural environment, (EDTA class phytoremediation is most effective 50%, and the phytic acid class is 65% to improve the phytoremediation effect; Use cost is lower less because of consumption.

Claims

1. the prescription of a Cd metal antidote and compound method thereof is characterized in that: described prescription 70% phytic acid 0.1～0.2% shitosan 1～3%, red mud 0.002%～0.003%, ammoniacal liquor 0.001%, acetic acid 0.01%, water 97～99%.

2. a kind of Cd metal antidote according to claim 1 and compound method thereof is characterized in that: described compound method step is that (1) takes by weighing 1.4g 70% phytic acid, is diluted to 1L, and making mass fraction is 10 ^-3Solution; (2) take by weighing 10 gram shitosans in above-mentioned solution, add 1% acetum until dissolving; (3) regulating pH with ammoniacal liquor is 6～7, and (4) press 20mgkg ^-1Add red mud.