91 results about "Inorganic arsenic" patented technology

The invention discloses a novel normal-temperature arsenic removal agent and a preparation method and application of the novel normal-temperature arsenic removal agent. The arsenic removal agent comprises a supporter and a Cu-Ni active component loaded on the supporter, wherein the Cu-Ni active component is CuO and NiO, and the mass ratio of the supporter, CuO and NiO is 100: (1-10): (1-10). The preparation method comprises the following steps: (1) impregnating the supporter into soluble nickel salt aqueous solution, filtering to remove filtrate, and then drying and roasting sequentially to obtain a NiO loaded supporter; and (2) impregnating the NiO loaded supporter into soluble copper salt aqueous solution, filtering to remove filtrate, and then drying and roasting sequentially to obtain a CuO loaded supporter, that is, the arsenic removal agent. The arsenic removal agent can effectively remove inorganic arsenic in catalytic cracking gasoline, has a precision reaching 10ppb or less and has an arsenic loading capacity of 1.3% or more.

The invention discloses an enhanced montmorillonite adsorbent and a preparation method thereof. The enhanced montmorillonite adsorbent is made by modifying montmorillonite with sodium salts, iron salts and microwave. The preparation method comprises the following steps of: firstly treating montmorillonite used as a raw material with a sodium carbonate solution with mass concentration of 8-10 g/L, then treating the montmorillonite with 0.1 mol/L FeCl3 solution, treating with microwave, and drying and calcining to obtain the enhanced iron-based montmorillonite. After being treated with the adsorbent disclosed by the invention, the waste water containing arsenic and inorganic arsenic has the arsenic content lower than 50 mcg/L. The purpose of environment-friendly treatment is achieved, the raw material can be obtained easily, the adsorbent can be prepared easily with low cost and has bright application prospect.

The invention belongs to the technical field of paddy field arsenic pollution treatment, and particularly discloses a rice cultivation water management method for a moderate and mild arsenic pollution paddy field. The water content of the arsenic pollution paddy field is reasonably adjusted by alternately performing waterflooding-moistening irrigation in the whole growth period of rice, the arsenic content of soil solution is remarkably reduced, and trivalent arsenic in soil can be transformed into low-toxicity pentavalent arsenic. By changing the form and the valent state of the arsenic in the soil, arsenic absorption and accumulation of the rice are reduced, so that the arsenic content of the rice is reduced. Measurement proves that the arsenic content of the rice cultivated by the method meets the pollutant limit standard (inorganic arsenic<0.2mg/kg, GB2726-2012) of national food.

The invention discloses a method for growing rice by using an enzyme. The method is characterized in that the method comprises a seedbed management process; the seedbed management process comprises the steps of bed soil preparation, soil disinfection and seedbed fertilization; the bed soil preparation step is realized by blending dry field soil or paddy field soil with an enzyme fertilizer; the soil disinfection step is realized by spraying an environmentally-friendly enzyme solution on soil based on the conventional soil disinfection; and the seedbed fertilization step is realized by additional application of the enzyme fertilizer based on the conventional seedbed fertilization. The invention also discloses an enzyme rice. The chalky grain percentage is lower than 8.5, the amylose contentpercentage is lower than 17.25, the lead content is less than 0.02 mg/kg, the inorganic arsenic content is less than 0.01 mg/kg, the cadmium content is less than 0.01 mg/kg, and the content of malathion, fenitrothion and pretilachlor is 0; and the method solves the problems of soil damages and environment and rice pollution caused by high dosages of chemical fertilizers and pesticides, in existing conventional rice growing methods.

The invention relates to a sulfydryl-amidogen modified bifunctional mesoporous silicon material synthesized by a copolycondensation method. The material can simultaneously adsorb two types of inorganic arsenic forms, namely pentavalent arsenic (As (V)) and trivalent arsenic (As (III)) under the condition of weak acid. The prepared material is put in a syringe filter and is fixed by virtue of a filter membrane so as to be made into a simple solid-phase extraction head. When solid-phase extraction is carried out, a sample solution passes through the extraction head, and the two types of inorganic arsenics in the solution are adsorbed by the material at the time; then a strategy of stage elution is adopted: the adsorbed As (V) is eluted with dilute nitric acid and collected to determine, then the adsorbed As (III) is eluted with a nitric acid/potassium iodate solution and collected to be measured, and therefore the contents of As (V) and As (III) in the sample solution are obtained. Compared with other solid-phase extraction methods, the method has the advantage that the sample only needs once extraction so that the contents of As (V) and As (III) can be respectively obtained. In addition, a device is simple and convenient, and the sample pretreatment is easily and fast completed.

The invention discloses a hydrogel material capable of removing arsenic. A simple ammonia gas volatilization way and a simple cross-linking method are utilized to introduce Fe <3+> into a chitosan type hydrogel system, so that the hydrogel material which is doped with Fe3O4 and good in mechanical performance is obtained. The prepared hydrogel material has a network three-dimensional structure and very strong removal capability for an important environmental pollutant inorganic arsenic (+5 valence); a natural high polymer material is used, so that material cost for preparing the hydrogel material is low, and therefore, the hydrogel material is an environment-friendly and efficient arsenic-removing material.

Provided is a preparation method of a magnetic nanometer inorganic arsenic adsorbent. The adsorbent is CoFe2O4@MIL-100(Fe) of a mesoporous core-shell structure. The method includes the following steps of firstly, dissolving cobalt chloride, ferric chloride, natrium aceticum and polyethylene glycol-6000 in ethylene glycol, and conducting hydrothermal reaction at 160 DEG C for 16 h to prepare mesoporous CoFe2O4 magnetic nanoparticles; secondly, adding the CoFe2O4 nanoparticles to an ethyl alcohol solution of mercaptoacetic acid to be stirred for 24 h under the protection of nitrogen for surface modification; thirdly, alternatively soaking the modified CoFe2O4 in ferric chloride and a trimesic acid ethyl alcohol solution, and preparing a target object through a layer-by-layer self-assembly method. The method has the advantages that the method is simple in preparation process, easy to implement and low in cost; the magnetic nanometer adsorbent is high in inorganic arsenic removal efficiency and high in interference resistance and can efficiently remove trivalent arsenic and pentavalent arsenic in natural water at the same time without any pretreatment.

The invention discloses a medicine composition containing inorganic arsenic compounds and application thereof. The medicine composition comprises inorganic arsenic compounds, scutellarin or scutellarein, is used for preparing medicines for treating cancers, and has a better effect on cancer cell inhibition than that by singly using inorganic arsenic compounds and that by singly using scutellarin or scutellarein. According to the medicine composition, the treatment dosage of inorganic arsenic compounds can be reduced, the cancer inhibition effect can be enhanced, and the systematic toxin of inorganic arsenic compounds can be effectively reduced.

The invention discloses a method for extracting inorganic arsenic in rice. The method comprises the following specific steps: (1) preparing an III-As standard solution; (2) preparing a sample extraction solution, namely placing a rice sample and a hydrochloric acid solution according to a certain solid-to-liquid ratio in a closed microwave digestion instrument, setting a working parameter of the digestion instrument, standing an obtained digestion solution, extracting a supernatant liquor, adding a pre-reducer into the supernatant liquor and mixing evenly, centrifuging for 5 minutes at a speed of 15,000 rpm (revolutions per minute), and then standing and separating solution, thus obtaining the rice sample extraction solution; preparing a reagent blank solution synchronously; and (3) drawing a standard work curve and detecting the content of the inorganic arsenic in the sample solution. According to the method, the recovery rate of the III-As is 92-98%, the degree of precision is 2.5%, and the detection limit of the inorganic arsenic is 0.085 microgram/liter. The method, disclosed by the invention, has the advantages of short extraction time and high extraction efficiency, and is capable of accurately detecting the content of the inorganic arsenic in the rice.

The invention discloses an electrochemical method for detecting trace trivalent inorganic arsenic by using a mercaptoethylamine modified electrode, and relates to the field of electrochemical detection. The method solves the problems of complex process, long detection time, poor reproducibility and poor interference resistance of the conventional electrochemical methods for detecting the trivalent arsenic. According to the method, the mercaptoethylamine modified gold electrode serving as a working electrode, silver-silver chloride serving as a reference electrode and platinum serving as a counter electrode form a three-electrode system; and constant potential deposition is performed by applying a voltage through differential pulse voltammetry, dissolved oxidation reaction of arsenic is performed on the surface of the mercaptoethylamine modified gold electrode, and the trivalent arsenic is detected in a phosphate buffer solution. The electrode preparation method is simple, an electrochemical polarization process under high potential is avoided, the sensitivity and the reproducibility of the sensing detection are improved, and the problem of interference of copper ions is solved; and the detection time is short, the detection limit can reach 0.02mugL<-1>, and the method can be used for detecting the arsenic in a practical sample.

The invention discloses a pharmaceutical composition containing an inorganic arsenic compound and application of the pharmaceutical composition. The pharmaceutical composition contains the inorganic arsenic compound and Niclosamide and is used for preparing a cancer treatment medicine. Niclosamide has the molecular formula of C13H8Cl2N2O4 and the CAS number of 50-65-7. The pharmaceutical composition has a stronger cancer cell killing function than that of independent use of the inorganic arsenic compound or Niclosamide. The therapeutic dose of the inorganic arsenic compound is reduced, the cancer inhibition effect is enhanced, and the systematic poisonousness of the inorganic arsenic compound is effectively reduced.

The invention relates to the technical field of chemical analysis and detection and discloses an inorganic arsenic extraction method, a method for determination of inorganic arsenic in rice and application of the inorganic arsenic extraction method to inorganic arsenic extraction. The inorganic arsenic extraction method includes that an extracted sample is contacted with an inorganic arsenic extraction liquid which contains hydrochloric acid and a reducing agent, and the reducing agent is selected from one or more of thiourea, potassium iodide and ascorbic acid. By adoption of the hydrochloric acid solution containing the reducing agent as the extraction liquid, steps of extraction and reduction are carried out at the same time, and accordingly pretreatment operations are simplified, and pretreatment time is shortened. In addition, high efficiency and quickness in extraction of inorganic arsenic in the sample can be realized, and accurate quantitative detection of inorganic arsenic is realized as well.

The invention discloses a method for measuring inorganic arsenic content of marine algae products. The method comprises the following steps: A, digestion: weighing smashed and dry algae products to bedetected, placing the algae products to be detected in a first centrifugal tube, adding nitric acid and shaking uniformly to obtain a mixed solution; B, extraction: treating the mixed solution in a water bath at a constant temperature, cooling the mixed solution to normal temperature, centrifuging the mixed solution in a centrifugal machine, placing upper supernatant in a second centrifugal tube,adding normal hexane and centrifuging in the centrifugal machine; C, purification: placing lower supernatant in the second centrifugal tube into a third centrifugal tube after centrifugation, addingmixed powder of active carbon and C18, performing vortex oscillation, centrifugating in the centrifugal machine, and placing the supernatant of the third centrifugal tube after centrifugation into anorganic filtering membrane for filtering to obtain a sample solution to be tested; and D, test: quantitatively testing the sample solution to be detected with a liquid chromatogram atomic fluorescencespectrometer. The detection method has the advantages of high accuracy, convenience and rapidness in operation method and high detection efficiency.

The invention discloses a method for measuring inorganic arsenic content of rice flour and a digesting-centrifuging device. The method mainly comprises the following steps: 1) extraction of inorganicarsenic; 2) filtering of an extracting solution; 3) detection with a liquid chromatography-inductively coupled plasma mass spectrometer; 4) result analysis: calculating the inorganic arsenic content shown in the description of the rice flour according to the weighed rice flour weight and detected concentration of the extracting solution. By adopting the digesting-centrifuging device, automatic digestion by means of swinging and heating can be realized, centrifuging operation can be performed directly after digestion, the workload of an operator is lowered greatly through the automatic digestion by means of swinging and heating, the digesting time is shortened greatly, and meanwhile the trouble in frequently replacing an instrument is avoided. By adopting the detection method disclosed by the invention, the difficulty in preparing a moving phase is lowered, the salt content of the moving phase is lowered, the instrument is protected better, and the detection limit, sensitivity and measurement linear range are not influenced.

The invention relates to a preparation method of low-arsenic kelp nutritional flavor ingredients. The method is composed of the following steps: drying kelp and crushing; adding 4-6 times of an ethanol-water solution into kelp powder and extracting for two times by microwaves; filtering under reduced pressure; combining filtrates to obtain a kelp extracting solution; concentrating the kelp extracting solution at a low temperature until the mass is 60%-75% of the mass of the raw materials; separating solid and a water layer to finish primary arsenic removal; dissolving the solids with ethanol and concentrating at a low temperature until the mass is 8%-23% of the mass of the raw materials; freezing and filtering; separating the filtrates and filtering dreg to finish secondary arsenic removal; and emulsifying, and spray-drying the filtrates to obtain a powdery product of the low-arsenic kelp nutritional flavor ingredients (the yield is about 6%-14% and the content of inorganic arsenic is less than or equal to 3mg/Kg). The preparation method takes the water as an arsenic removing agent and is safe and efficient; the removing rate of the inorganic arsenic is up to be more than 95%; the process is simple and convenient and the conditions are moderate; the nutritional and flavor ingredients in the product are sufficiently protected; and an inorganic arsenic layer has small weight and is free of emission.

An iron composition having a plurality of elemental components is disclosed. The major component is an iron component of at least about 68% to about 92% iron by weight. Other components by weight include manganese; cerium; carbon; phosphorous; sulfur; aluminum; silicon; chromium; copper; and zinc. Combined with layers of sand, brick chips and/or charcoal, the iron composition can be used to create a water filter for filtering inorganic arsenic species and soluble metal ions out of water. To enhance hydrous ferric oxide complexation and precipitation, the iron composition may be treated with food grade acids or a water mixture.

The invention relates to an adsorbent for removing pentavalent inorganic arsenic in water and an application method thereof. The adsorbent includes a carbide material and a ferrous salt, and the mass ratio of carbide material to Fe <2 +> in the ferrous salt is 20:1 to 1600:1. The adsorbent for removing the pentavalent inorganic arsenic in the water is added into the water containing As (V), and the molar ratio of Fe <2 +> in the adsorbent to As (V) in the water is 0.25:1 to 8:1. The adsorbent does not need expensive and complex metal adsorption material preparation process, may not produce secondary pollution, a provided arsenic removing method can greatly improve the arsenic removal efficiency of a pure carbide material adsorption material, can be used to control the arsenic concentration in groundwater, drinking water, industrial arsenic-containing wastewater and sewage secondary sedimentation tank effluent, and can achieve the national standards.

The invention particularly relates to adsorbing powder for heavy metals in soil. The adsorbing powder for the heavy metals in the soil is prepared from fish protein peptide and algae paste through a complexing reaction, wherein the fish protein peptide is embedded in macromolecules of the algae paste, and carries negative charges; after the algae paste absorbs water and expands to be a porous structure, heavy metal ions enter pores under the attraction of the negative charges to form water-insoluble organic macromolecules which are embedded by macromolecules of the algae paste; the weight ratio of the fish protein peptide to the algae paste is 1 to (1.5 to 4). A production method adopts zymolytic fish protein peptide and algae paste to carry out complexing reaction to obtain the adsorbingpowder. The adsorbing powder and the production method have the beneficial effects that when the adsorbing powder is used for treating the soil, the contents of inorganic arsenic and inorganic mercuryin the soil can be reduced by 50% or above, the contents of inorganic cadmium, inorganic lead and inorganic chromium are also respectively reduced by 3% to 5%, and compared with other materials suchas pig manure charcoal, attapulgite, biological straw charcoal, the adsorbing powder has obvious advantages in the aspects of capability of adsorbing the heavy metal and use cost.

The invention belongs to the field of environmental functional materials, and relates to a preparation method of an alginate metal cross-linked chitosan composite adsorption material and application thereof. The adsorption material is a composite material obtained by crosslinking of a transition metal ion with chitosan and compounding with the alginate. An adsorbent has a porous small spherical shape and is applied to the adsorption of inorganic arsenic in waste water. The adsorbent has a small input amount and a high adsorption capacity, is easily separated from an aqueous solution system, and can be regenerated and reused after being desorbed. The alginate metal cross-linked chitosan composite adsorption material prepared has good acid resistance and large adsorption capacity and can bedirectly separated; the process for treating arsenic-containing wastewater is simple, environmentally friendly and low in cost, and has excellent application prospects in the water treatment field.

The present invention provides the preparation process of magnetic active carbon and belongs to the field of water processing technology. The magnetic active carbon has relatively great specific surface area and excellent adsorption performance, and is easy to separate magnetically to recover. The present invention provides the application of magnetic active carbon in water processing to eliminate organic matter and inorganic arsenic.

The invention discloses a preparation method of special half-dried flour for physalis alkekengi rice noodles. According to the method, rice is used as a raw material. The method comprises the following steps of soaking the rice, performing whole-rice fermentation, performing washing and separation, performing draining, performing crushing, and finally performing solid state fermentation treatment so as to obtain the half-dried rice flour with low content of heavy metals. According to the method disclosed by the invention, the heavy metals in the rice are dissociated out by a fermentation method, the fermentation reaction efficiency is improved through a dynamic reverse-flow device, after water is thoroughly drained, the whole rice is crushed, rhizopus oryzae and ester-production fragrance-production yeast are added for performing solid state fermentation on the half-dried rice flour, and finally re-crushing is performed so that the half-dried rice flour is obtained for standby application. The rice flour prepared by the method has special fragrance and is low in the content of the heavy metals, wherein the content of cadmium is lower than 0.2mg/kg, the content of total mercury is lower than 0.02mg/kg, the content of lead is lower than 0.2mg/kg, the content of inorganic arsenic is lower than 0.2mg/kg, and the removing rate for the heavy metal cadmium can reach 95% or above; and besides, the method is simple to operate, low in cost and convenient to use, and can be used for production of the physalis alkekengi rice noodles.