112 results about "Ammonium ferric sulfate" patented technology

A polishing composition for a memory hard disk, which comprises the following components (a) to (d):(a) from 0.1 to 50 wt %, based on the total amount of the polishing composition, of at least one abrasive selected from the group consisting of silicon dioxide, aluminum oxide, cerium oxide, zirconium oxide, titanium oxide, silicon nitride and manganese dioxide,(b) from 0.001 to 10 wt %, based on the total amount of the polishing composition, of at least one iron salt selected from the group consisting of iron nitrate, iron sulfate, ammonium iron sulfate, iron perchlorate, iron chloride, iron citrate, ammonium iron titrate, iron oxalate, ammonium iron oxalate and an iron chelate complex salt of ethylenediaminetetraacetic acid,(c) from 0.01 to 30 wt %, based on the total amount of the polishing composition, of at least one peroxydisulfate salt selected from the group consisting of ammonium peroxydisulfate, potassium peroxydisulfate and sodium peroxydisulfate, and(d) water.

A corrosion-inhibited fire retardant composition is provided that comprises at least one ammonium polyphosphate, at least one suspending agent, at least one phosphonate selected from a group consisting of aminotri(methylenephosphonic acid), 1-hydroxyethylidene-1,1-diphosphonic acid, hexamethylenediaminetetra(methylenephosphonic acid), diethylenetriaminepenta(methylenephosphonic acid), salts thereof, and mixtures thereof and a corrosion inhibiting system. The corrosion inhibiting system is comprised of at least one corrosion inhibiting compound selected from a group consisting of azoles, insoluble ferric pyrophosphate, soluble ferric pyrophosphate, ferrous oxalate, ferric citrate, ferrous sulfate, ferric ammonium citrate, insoluble ferric orthophosphate, soluble ferric orthophosphate, ferric ammonium oxalate, ferric ammonium sulfate, ferric bromide, ferric sodium oxalate, ferric stearate, ferric sulfate, ferrous acetate, ferrous ammonium sulfate, ferrous bromide, ferrous gluconate, ferrous iodide, ferric acetate, ferric fluoroborate, ferric hydroxide, ferric oleate, ferrous fumarate, ferrous oxalate, ferrous oxide, ferric lactate, ferric resinate, and any combination thereof. Methods of making and using the same are also described. In addition, agricultural plant nutrients comprising the same are provided.

Corrosion-inhibited fire retardant compositions and methods of making and using the same are provided. The corrosion-inhibited fire retardant compositions are comprised of at least one fire retardant component, at least one biopolymer having a particle size diameter of less than about 100 microns, and a corrosion inhibiting system. The corrosion inhibiting system is comprised of at least one corrosion inhibiting compound selected from a group of compounds including azoles, insoluble ferric pyrophosphate, soluble ferric pyrophosphate, ferrous oxalate, ferric citrate, ferrous sulfate, ferric ammonium citrate, soluble ferric orthophosphate, insoluble ferric orthophosphate, ferric ammonium oxalate, ferric ammonium sulfate, ferric bromide, ferric sodium oxalate, ferric stearate, ferric sulfate, ferrous acetate, ferrous ammonium sulfate, ferrous bromide, ferrous gluconate, ferrous iodide, ferric acetate, ferric fluoroborate, ferric hydroxide, ferric oleate, ferrous fumarate, ferrous oxide, ferric lactate, ferric resinate and any combination thereof. In a specific embodiment, the corrosion-inhibited fire retardant composition includes a xanthan biopolymer.

The invention discloses a preparation method of a magnetic mesoporous carbon nitride adsorbent and a method for removing perfluorooctane compounds in water. The method comprises the following steps of: based on mesoporous carbon nitride as a matrix, and ammonium ferrous sulfate and ammonium ferric sulfate as an iron source, adjusting the alkaline environment of the liquid by ammonia water; and performing co-precipitin reaction in water bath condition. The saturation magnetization of the magnetic mesoporous carbon nitride prepared is 6.37emu / g. The magnetic mesoporous carbon nitride is used for removing perfluorooctane compounds [PFOS (Perfluorooctane sulfonates)] and [PFOA (Perfluorooctanoic acid)] in water, so that a good removal effect is obtained and adsorption equilibrium is quickly realized. Meanwhile, the magnetic mesoporous carbon nitride adsorbent provided by the invention can be recovered by additionally applying a magnetic field to the benefit of repeated use. The adsorbent provided by the invention has an important meaning for adsorption removal of perfluorooctane compounds, and has a good application prospect in wastewater treatment.

The invention discloses an air formaldehyde self testing kit, including an absorbent, an acidifying agent, a diluent, a chromogenic agent and a colorimetric card. The absorbent is a phenol reagent, the acidifying agent is phosphorus pentoxide, the diluent is pure water, and the chromogenic agent is ammonium ferric sulfate. The self testing kit is suitable for household usage, and is economical, convenient, accurate and quick in detection of the indoor formaldehyde content.

The invention discloses a method for preparing iron p-toluenesulfonate and a solution thereof. The method for preparing the iron p-toluenesulfonate includes the steps that (1) a sodium hydroxide solution and an ammonium ferric sulfate solution are prepared; (2) the sodium hydroxide solution is added in the ammonium ferric sulfate solution, the final potential of hydrogen (pH) value of reaction is 7.0 to 9.0, and iron hydroxide precipitation is obtained; (3) the iron hydroxide precipitation is washed, placed in a filter bag and suspended to be dried at room temperature until the iron hydroxide precipitation which is colloid and contains a small amount of water is formed; (4) iron hydroxide which is suspended to be dried is reacted with a p-toluene sulfonic acid to generate an iron p-toluenesulfonate solution; (5) the iron p-toluenesulfonate solution is filtered and concentrated to be viscous, and discharging-cooling and crystallization are performed; and (6) crystals are crushed and dried to obtain the product. The method for preparing the iron p-toluenesulfonate and the solution thereof has the advantages that the activity of the reaction intermediate iron hydroxide is good, the reaction with the p-toluene sulfonic acid is complete, the process is simple, the energy consumption and the cost are low, and the environmental pollution is small.

The invention provides a method for measuring chloride ions in an acidity plating solution. The method comprises the steps of adding sodium hydroxide in the acidity plating solution, adjusting the pH value of the plating solution to alkalinity, removing precipitate generated in the plating solution, adjusting the pH value of a certain amount of filtered plating solution to be 9-10 with nitric acid, titrating with a silver nitrate solution to a terminal point by using potassium chromate as an indicator, titrating with potassium rhodanide by using ammonium ferric sulfate as the indicator when the silver nitrate solution is excessive, and calculating the content of chloride ions in the acidity plating solution. By adopting the method for measuring the chloride ion in the acidity plating solution, the content of the chloride ions in the acidity plating solution can be rapidly and accurately measured on the scene and in a small-and-medium size lab, an expensive analytical instrument is not required, the method is convenient and rapid, and has the time-saving effect, and the analysis result is accurate and reliable. Reaction measuring substances are all regular chemicals, low in cost and toxicity and convenient to manage and use.

The invention provides a method for measuring content of titanium dioxide in titanium concentrate. The method comprises the following steps of: melting a sample through zinc powder-sodium hydroxide, wherein most of the Ti4+ is reduced into Ti3+ through the zinc powder during melting; reducing the rest Ti4+ into Ti3+ through little Al powder by isolating the air under the medium of hydrochloric acid and sulfuric acid; and titrating through the ammonium sulfate standard solution with the ammonium thiocyanate served as an indicator. Compared with a traditional Panzhihua steel method, the method provided by the invention improves repeated using time of a corundum crucible to 2 to 3 times, and reduces quantity of a reducing agent of 1g; and the method is precise in result, and can meet a requirement on production.

The invention discloses a method for determining the formaldehyde content in air. The method comprises the steps of reacting by virtue of formaldehyde of different concentrations with a phenol reagent so as to generate piperazine, drawing a standard curve by virtue of a phenol reagent colorimetric method, then in the presence of ferric ion of ammonium ferric sulfate, oxidizing piperazine with the ferric ion in an acidic solution to form a blue-green compound, and according to color shade, carrying out colorimetric determination so as to obtain the formaldehyde content in air. The method for determining the formaldehyde content in air has high determination sensitivity to formaldehyde and good selectivity and is simple and convenient in operation.

The invention discloses a non-oxidative magnetic multi-wall carbon nanotube and a preparation method as well as application thereof. According to the adsorbent, mutually cross-linked non-oxidative multi-wall carbon nanotube is used as a matrix, and magnetic iron oxide particles are loaded on the matrix. The preparation method comprises the following steps of: adding the non-oxidative multi-wall carbon nanotube into mixed solution of ammonium ferric sulfate and ammonium ferrous sulfate under the protection of inert gas; performing ultrasonic dispersion; dropwise adding ammonia water at the time of ultrasonic dispersion; adjusting the pH value of suspension; fully stirring at a certain temperature and then cooling mixed solution; and separating precipitate, washing and drying. The application comprises the following steps of: adding the adsorbent into atrazine and / or copper ion solution; performing oscillation adsorption reaction under room temperature condition; and separating the adsorbent by using a magnet. The non-oxidative magnetic multi-wall carbon nanotube and the preparation method as well as application thereof disclosed by the invention have the advantages of easiness in operation, wide application range, stable magnetic property of the adsorbent, easiness for separation, high adsorption capacity, short balance time, reusability and the like.

The invention relates to a preparation and use method for a color development detecting sheet for detecting sulfide in water; and the preparation method comprises the following steps of: first, uniformly mixing concentrated sulfuric acid, anhydrous sodium sulfate and ammonium ferric sulfate; pressing a mixture so as to obtain a sheet I; uniformly mixing melted polyethylene glycol 4000 and N,N-dimethyl-p-phenylenediamine hydrochloride; after cooling a mixture, grinding the mixture into a powder; uniformly mixing the powder and anhydrous sodium sulfate; pressing the mixed powder and anhydrous sodium sulfate so as to obtain a sheet II; after attaching a little amount of melted polyethylene glycol 4000 on the surface of the sheet II, rapidly bonding the sheet II and the sheet I in an integrated way, so as to form the color development detecting sheet for detecting the sulfide in the water; directly using or sealing the color development detecting sheet; and preserving the color development detecting sheet away from light. During using, the color development detecting sheet is immerged into 10 ml water to be detected; after the water is slightly shaken for 10 minutes, the detecting sheet is dissolved; and then a portable spectrophotometer is used for measuring. According to the invention, the color development detecting sheet has the advantages of convenience for carrying, easiness for safeguarding, no need of any reagent in use as well as accurate and reliable result and is suitable for field quantitative detections of the sulfides in water bodies, such as surface water, domestic sewage, industrial wastewater and so on.

The invention discloses a preparation method of a sapphire doping agent, which is characterized in that the method comprises the following steps: respectively adding ammonium ferric sulfate powder and ammonium fluotitanate powder into pure water for preparing a solution with the ammonium ferric sulfate content between 0.005 and 0.01 g / ml and the ammonium fluotitanate content between 0.0005 and 0.001 g / ml; mixing and stirring the solution and the ammonium aluminum sulfate powder according to the volume to weight ratio of 14 to 15 ml / kg; then, maintaining the constant temperature for 60 to 90 minutes after mixed materials are heated to 200 DEG C, and carrying out dewatering treatment; maintaining the temperature for 100 to 120 minutes after the materials are heated to 900 DEG C, and carrying out deamination and desulfurization treatment to obtain target products. The sapphire doping agent of the invention is suitable for being used as raw materials of growing sapphire by a flame method, a pulling method and the like, and the grown monocrystals can be used as high-quality windows, high-precise components and the like.

The invention relates to a detection method for measuring silver content of silver paste for a solar battery. The detection method comprises the following steps of: firstly, weighing a right amount of a silver paste sample for the solar battery, adding nitric acid, and slowly heating to nitrify the solution through an electric hot plate until the solution is basically clear; then, adding a certain amount of nitric acid into a test solution subjected to primary nitration by nitric acid, sequentially heating to 150 DEG C by the electric hot plate for secondary nitration until the solution is completely clear, and finally taking ammonium ferric sulfate as an indicating agent, using a thiocyanate standard solution to titrate a test solution, and meanwhile, carrying out a blank test; and calculating the silver content of the sample according to test data and a formula. The result proves that the relative standard deviation (n=11) of the silver sample, measured according to the invention, is less than 1%, and the method is accurate and reliable. The detection method provided by the invention has the advantages that the operation is simple, the detection method is economical and practical, the measuring speed is rapid, the efficiency is high, the measuring result is accurate, and the applicability is good.

The invention discloses an automatic analysis method of formaldehyde in a water sample. The automatic analysis method comprises the following steps of: enabling a mixed solution of a test sample S1, reaction liquid R2 and a reference solution R0 to enter an optical flow cell by adopting a negative-phase reference flow injection method; transmitting a signal to a computer processing system for processing by an optical detector to obtain a base line, a standard sample or a test sample which is mixed with the reaction liquid R2 and a chromogenic solution R1 to generate chromogenic reaction; and enabling the formed chromogenic mixed solution to enter the optical flow cell, and transmitting the signal to the computer processing system for processing by the optical detector to obtain a standard sample spectrogram or a test sample spectrogram; and calculating the content of formaldehyde in the test sample by a regression equation of a standard sample working curve according to the peak height of the test sample spectrogram, wherein the chromogenic solution R1 is an ammonium ferric sulfate-hydrochloric acid aqueous solution; the reference solution R0 is hydrochloric acid aqueous solution; the reaction liquid R2 is a phenol reagent aqueous solution. The analysis apparatus comprises a sample flow path with a cation exchange column, a reference solution flow path, a chromogenic solution flow path, a reaction liquid flow path, an analysis flow path and the computer processing system.

The invention discloses a method for determining the content of sodium chloride in hexamethylene 1, 6-disodium dithiosulfate dihydrate, relates to a method for determining the content of sodium chloride in HTS, and aims to solve the problem of high errors of the existing method for determining the content of sodium chloride in HTS. The method comprises the following steps of firstly, preparing a solution, namely, preparing NaCl standard solution, preparing AgNO3 solution, preparing NH4SCN solution, and preparing an ammonium ferric sulfate indicator; secondly, calibrating the NH4SCN solution; and thirdly, titrating an HTS specimen. The method is mainly used for determining the content of sodium chloride in hexamethylene 1, 6-disodium dithiosulfate dehydrate.

The invention discloses a method for rapidly screening free formaldehyde in cosmetics onsite. Whether the content of the free formaldehyde in cosmetics exceeds the limiting range of 0.2% is detected in a semiquantitative mode. The method comprises the following steps of: taking a sample and putting into a head space bottle, adding water, sealing, heating, vacuuming the air at the upper part, feeding into a phenol agent absorption solution, oscillating, adding an ammonium ferric sulfate solution, metering the volume to be 10mL, uniformly shaking, developing, comparing the color of the solution with a prepared standard color compassion card after 5 minutes so as to rapidly screen a positive sample. The method is simple to operate, free of interference in matrix color, remarkable in development reaction, free of professional personnel in operation and low in cost.

The invention discloses a soilless cultivation nutrient formula of peonies. The soilless cultivation nutrient formula is composed of, by weight, 13-16.5 parts of diphenylamine, 11.5-12.5 parts of ammonium ferric sulfate, 2-20 parts of auxin, 4-5 parts of methionine, 0.4-0.8 part of barium sulfide, 0.1-0.3 part of barium vanadate, 0.1-0.3 part of iodine pentafluoride, 0.05-0.2 part of glycerol phosphate calcium and the balance water. The soilless cultivation nutrient formula is made by weighing and evenly mixing the ingredients according to the ratio. By the adoption of the nutrient liquid, the seepage force and diffusivity of the nutrient liquid are greatly enhanced in the breeding process, so that the seeding stage is greatly shortened, the emergence rate is increased, the quality of emergence is improved, and meanwhile the cost is lowered; the nutrient liquid is more suitable for high-altitude low-temperature seedling cultivation.

The invention aims to provides a method for determining titanium dioxide content in titanium concentrate. The method comprises the steps of (1) titanium concentrate sample preprocessing, (2) preparation of a dissolved sample of the titanium concentrate sample, (3) the titanium concentrate dissolved sample titration and (4) titanium dioxide content calculation. The detailed method comprises thesteps that the titanium dioxide content in the titanium concentrate is determined, and the titanium dioxide content determination is much important in determining the titanium concentrate raw materialquality and controlling the titanium dioxide production. It is due to the fact that partial titanium dioxide can be converted into an insoluble rutile form in the sample melting process of the titanium concentrate, acid is adopted to dissolve the sample, thereby easily leading to incomplete sample decomposition and a lower analysis result of the titanium dioxide. An ammonium ferric sulfate volumetric method is adopted to determine the titanium dioxide content in the titanium concentrate, alkaline reinforcer-sodium peroxide is adopted to melt the sample at a high temperature, so that the sample decomposition is more thorough, and it is more beneficial to extract Ti from the sample. According to the method, the analysis result of TiO2% is more accurate, and the production requirements are completely met.

The invention belongs to the technical field of organic synthesis technologies, and particularly relates to a new process for preparing food-grade 2,6-di-tert-butyl-p-methylphenol. The process comprises the steps: using p-cresol and isobutylene as reaction raw materials, selecting a solid acid catalyst, and performing an alkylation reaction under the heating condition so as to obtain the product,wherein the solid acid catalyst is cerium sulfate, ammonium ferric sulfate or phosphotungstic acid. According to the preparation process, the reaction yield of 2,6-di-tert-butyl-p-methylphenol which is prepared from cresol and isobutylene can be improved by using the solid acid catalyst, the reaction time is shortened, purification in the later stage is convenient, and the product can reach the food-grade requirement.

The invention discloses a titration device and titration method for determining chloridion in cement. The device comprises a stand, a burette arranged on the stand, a reagent bottle arranged at the lower of the burette, wherein the reagent bottle is a porcelain crucible. An ammonium ferric sulfate indicator is adopted as the indicator in the titration method, the porcelain crucible is taken as the reagent bottle containing a cement solution and an ammonium thiocyanate solution is adopted as a titration solution. According to the titration device and the titration method, the accuracy and the reliability of determining the chloridion in the cement are improved; meanwhile, the requirements of the device and the method on the theoretical knowledge level and the operation experience of operating personnel are low in the titration process and asthenopia due to the fact that the operating personnel observe a color change of the titrated solution can be effectively avoided. Meanwhile, the method is simple in operation and low in detection cost, so that the method and the device are especially suitable for massive sample testing.

The invention discloses a method for rapidly and synchronously detecting sodium chloride and potassium chloride in food. The method comprises the steps of: 1) constructing a working curve: 2) processing the food to be detected into a sample to be detected, and determining the conductivity K of the sample to be detected with a volume of V; 3) removing protein in the sample to be detected with the volume of V, adding silver nitrate for titration, and titrating excessive silver nitrate by using a potassium thiocyanate standard titration solution by using ammonium ferric sulfate as an indicator to obtain the chloride content X in the sample to be detected; and 4) calculating the content of sodium chloride and the content of potassium chloride according to formulas III-VIII. According to the method, two binary one-time equations are used for simultaneous determination, subsequent calculation is simple, only the equations are substituted for calculation, and the content of sodium chloride and potassium chloride in the salt-reduced marinated meat and the salt-reduced marinated soup can be rapidly, massively and accurately determined synchronously.

The invention provides detection agents for detecting the concentration of urea in water, a preparation method of the detection agents and a detection method. The detection agents comprise the reagentA and the reagent B, the reagent A is mixed acid, and the reagent B is a color rendering agent; the mixed acid is a mixed solution of sulfuric acid, phosphoric acid and ammonium ferric sulfate, wherein the volume ratio of the sulfuric acid to the phosphoric acid is (2:0.9) to (2:1.1), and the concentration of the ammonium ferric sulfate in the mixed solution is 0.5%-0.8%; and the color renderingagent is a mixed solution containing 0.2%-1.0% diacetylmonoxime and 0.2%-1.0% antipyrine.

Provided are a superparamagnetic composite material of a carbon nanotube coated coupling agent and a preparation method thereof. The surfaces of CNTs (carbon nanotubes) are covered with a superparamagnetic iron oxide nanoparticle layer respectively, and the surface of the magnetic nanoparticle layer is modified with a silane coupling agent film. The preparation method includes the steps of (1) dispersing the CNTs in a mixed acid solution of concentrated sulfuric acid and concentrated nitric acid at the ratio of 3:1 for pretreatment reaction at the temperature of 60 DEG C to 80 DEG C; (2) adding the pre-treated multi-walled CNTs in an ammonium iron sulfate solution, dropwise adding aqueous ammonia and stirring at the temperature of 40 DEG C to 60 DEG C; (3) separating the generated magnetic multi-walled CNTs with a magnet after the reaction and drying in vacuum at the temperature of 60 DEG C to 100 DEG C; (4) dispersing the magnetic carbon nanotube material in anhydrous ethanol, adding acetic acid and 3-mercaptopropyl trimethoxysilane, stirring at the temperature of 30 DEG C to 60 DEG C, adding acetone for reacting for 3 hours, performing centrifugal separation and drying in vacuum at the temperature of 40 DEG C to 80 DEG C to obtain the material.

The present invention discloses a detection method for hydrogen sulfide in a grape wine. The detection method comprises: taking a grape wine sample, adding a methyl orange indicator, and standing; adopting nitrogen as a carrier gas, introducing into the grape wine sample, and extracting hydrogen sulfide gas; importing the carried hydrogen sulfide gas into an absorption liquid, adding a N,N-dimethyl-1,4-phenylenediamine solution and an ammonium ferric sulfate solution, and standing; and finally determining the absorbance of the obtained sample at 670 nm by adopting distilled water as the control. According to the present invention, the detection method has characteristics of simple operation, less interference, high stability and rapid analysis, and is suitable for rapid hydrogen sulfide detection in grape wine companies.

The invention discloses gardenia soilless culture nutrient formula and application thereof. The gardenia soilless culture nutrient formula consists of 13-17 parts of ammonium hydrogen carbonate, 11.6-12.6 parts of ammonium ferric sulfate, 2-20 parts of auxin, 4-6 parts of tyrosine, 4-6 parts of serine, 0.4-0.6 part of palladium nitrate, 0.1-0.3 part of zinc selenide, 0.1-0.3 part of iodine bromide, 0.08-0.2 part of sodium methylate and the balance of water which are weighed according to the proportions and are uniformly mixed. By adoption of a nutrient solution, the seepage force and the diffusivity of the nutrient solution are greatly improved during seedling, so that the seeding stage is greatly shortened, the emergence rate is increased, and the quality of seedlings is improved; meanwhile, the cost is reduced; furthermore, the nutrient solution is more suitable for high-altitude and low-temperature seedling.

The invention discloses a method for determining the content of titanium dioxide in ilmenite. The method comprises the following steps: adding mixed acid composed of concentrated nitric acid and concentrated phosphoric acid into an ilmenite sample to decompose an ore sample; adding mixed acid composed of concentrated hydrochloric acid and sulfuric acid for redissolution; adding an aluminum foil for reduction, dropwisely adding an indicator, and carrying out titrating with an ammonium ferric sulfate standard solution. The method for determining titanium dioxide in ilmenite has the advantages ofshort time consumption, high accuracy and good reproducibility, and can better meet the requirements of industrial analysis.

The invention discloses an improved method for rapid detection of formaldehyde content, and the method includes the following steps: taking a to-be-measured food sample for ultrasonic crushing, adding redistilled water to dissolve the to-be-measured food sample, adding an ethanol solution, and standing for separation to obtain a formaldehyde-containing solution A; adding an excess amount of a silica gel surface molecular imprinted polymer to the formaldehyde-containing solution A, and centrifuging after ultrasonic dispersion to obtain a solution B; adding the redistilled water to dissolve a phenol reagent to obtain a solution C, adding hydrochloric acid to dissolve ammonium ferric sulfate to obtain a solution D; and mixing the solution B, the solution C and the solution D, add the redistilled water for dilution, standing after shocking reaction, and measuring with a visible light spectrophotometer to obtain results. The improved for rapid detection of formaldehyde content has the characteristics of fast speed, high accuracy and high sensitivity, the minimum detectable concentration is 0.02ppm, and the method can effectively detect trace formaldehyde in illegally added food, and is worthy of promotion.

The invention discloses a dracaena sanderiana soilless culture nutrient formula comprising the components in parts by weight: 13-18 parts of diisopropanolamine, 10-12.5 parts of ammonium ferric sulfate, 2-20 parts of salicylic acid, 4-5 parts of tryptophan, 4-5 parts of threonine, 0.4-0.6 part of palladium nitrate, 0.1-0.3 part of barium hydroxide, 0.1-0.3 part of iodine pentoxide, 0.08-0.2 part of calcium gluconate, and the balance water; the nutrient formula is obtained by weighing the components according to the proportion and mixing evenly; with the use of the nutrient solution, the osmotic force and diffusivity of the nutrient solution are increased greatly during seedling culture, and thus the seedling emergence period is greatly shortened, the seedling emergence rate and the quality of emergence seedlings are improved, and besides, the cost is reduced; and the nutrient solution is more suitable for high-altitude low-temperature seedling culture.