10 results about "Molybdenum blue" patented technology

The utility model discloses a device for detecting silicon dioxide in seawater, relates to the technical field of silicon dioxide detection, and aims to solve the problem that most of the conventional silicon molybdenum blue colorimetric methods are interfered by day and night temperature difference, seawater turbidity and various ions in seawater. In order to solve the problems that the accuracy of the SiO2 measurement result is low, many troubles are brought to analysts, and the overall detection precision is reduced in the prior art, the technical scheme is characterized by comprising an input unit, a reaction reagent, a detection device, an output unit, a mounting box and a temperature control device, a transparent container for storing liquid, a detection light source group for irradiating the liquid and a reaction receiver for receiving and detecting light source signals are arranged in the detection device, and the input unit, the reaction reagent and the detection device are mounted in the mounting box; and a temperature control device for detecting, regulating and controlling the temperature in the mounting box is arranged in the mounting box. The effects of full reaction, full detection and high-precision detection are achieved.

The invention belongs to the technical field of analysis and detection, and relates to a device system and a detection method for detecting trace fluosilicic acid in hydrofluoric acid, the device system comprises a sample introduction unit, a first-dimensional separation unit, an enrichment conversion unit, a second-dimensional separation unit, a post-column derivatization unit and a detection unit which are connected in sequence; wherein the first-dimensional separation unit is used for separating hydrofluoric acid and fluosilicic acid; the enrichment conversion unit is used for enriching fluosilicic acid and converting the fluosilicic acid into fluorine ions and silicate radicals in an alkaline environment; the second-dimensional separation unit is used for separating fluorine ions and silicate radicals; the post-column derivation unit is used for gradually converting silicate into silicon molybdenum blue; the detection unit is used for detecting the absorbance of silicon molybdenum blue, and qualitative and quantitative analysis of fluosilicic acid is realized through signal response of specific wavelength. According to the method, accurate detection of ppb-grade trace fluosilicic acid in high-purity hydrofluoric acid is realized, and the actual detection requirements of high-end manufacturing industry on high-purity hydrofluoric acid quality control are effectively met.

The invention discloses a method for determining silicon dioxide in photovoltaic fluorine-containing high-phosphorus waste residue, which comprises the following steps: pretreating an original sample of the photovoltaic fluorine-containing high-phosphorus waste residue to obtain a sample to be treated; carrying out alkaline melting and dissolving treatment on the to-be-treated sample to obtain a to-be-detected mother solution; carrying out selective precipitation dephosphorization treatment on the mother liquor to be detected by adopting a precipitator to obtain a dephosphorization stock solution; carrying out masking interference treatment on the dephosphorization stock solution by adopting a tartaric acid solution to obtain a pretreatment test solution; carrying out a silicon molybdenum blue color development reaction on the pretreatment test solution to obtain a silicon molybdenum blue color development solution; and carrying out spectrophotometric determination and content calculation on the silicon molybdenum blue developing solution to obtain the mass fraction of silicon dioxide. The interference of high-concentration phosphorus elements in a sample matrix is effectively eliminated by treating a sample, and the content of silicon dioxide in the photovoltaic fluorine-containing high-phosphorus waste residues is rapidly and accurately measured.

The application discloses a method for rapidly and accurately determining the phosphorus content in dolomite and limestone, and belongs to the technical field of raw material analysis. The method provided by the application comprises the following steps: melting a sample by using a mixed flux containing sodium carbonate and sodium peroxide, and detecting the phosphorus content by using a sodium fluoride-stannous chloride-phosphorus molybdenum blue colorimetric method. The method provided by the application can more accurately determine the phosphorus content in dolomite and limestone, the recovery rate of a standard addition recovery experiment is between 98-103%, and accurate data can be provided for the application of dolomite and limestone.

The invention provides a method for measuring the content of phosphorus in sintered flux. The method comprises the following steps: S1, providing a to-be-measured sample; s2, adding a flux into the to-be-tested sample to obtain a mixed sample, melting the mixed sample under a high-temperature condition, and cooling the melt to obtain a cooled sample; s3, adding a hydrochloric acid solution into the cooled sample, and heating to leach the phosphorus element to obtain a leached solution; s4, perchloric acid is added into the leaching solution, heating evaporation is conducted till smoke is generated, and phosphorus is oxidized into orthophosphoric acid; s5, under the preset acidity condition, bismuth salt and ammonium molybdate are added into the leaching solution generating orthophosphoric acid, bismuth phosphorus molybdenum yellow ternary heteropolyacid is generated after reaction, ascorbic acid is added, and bismuth phosphorus molybdenum blue is generated after reaction; and S6, measuring the absorbance of the solution containing bismuth phosphorus molybdenum blue through a spectrophotometer, and calculating to obtain the phosphorus content of the to-be-tested sample. According to the method for measuring the phosphorus content in the sintered flux, the measuring accuracy is improved, and the measuring process is simpler and more efficient.

The invention discloses a method for detecting the concentration of available phosphorus in rice tissues, and belongs to the technical field of physiological and biochemical detection of plants. The method comprises the following steps: mixing and homogenizing a rice tissue sample, a grinding liquid and grinding beads, adding a weak acid extracting solution, and extracting under a low-temperature dark condition to obtain a crude extracting solution; adding hydrogel microspheres prepared by a specific method into the crude extract, swelling, centrifuging, and collecting concentrated and purified supernate; diluting the supernate, detecting the absorbance at the wavelength of 820 nm by adopting a molybdenum blue method, and calculating the available phosphorus concentration through a standard curve. Phosphate ions are passively concentrated through the selective water absorption characteristic of the hydrogel microspheres, macromolecular interferents such as pigments and proteins are removed through the size exclusion effect of the network structure of the hydrogel microspheres, and the detection sensitivity and the anti-interference capacity are remarkably improved. The method is simple, convenient and safe to operate, the detection limit reaches 0.015 mg / L, the adding standard recovery rate is 95.00%-105.00%, and the method is suitable for detecting rice samples of different tissue types, phosphorus content levels and indica and japonica rice varieties.

Test the silica and phosphate content of a water sample in a single device. In this test method, a first sample of water is subjected to colorimetric analysis in a reaction chamber to perform a "molybdenum blue" test, in which the silica and phosphate in the sample complex with a first reagent. Then, a second reagent is used to make the phosphate complex optically inert, and a third reagent is used to deepen the color of the silica complex. Thereby, the silica content is calculated. Another sample is subjected to colorimetric analysis without using the second reagent to obtain the combined content of silica and phosphate in the said another sample. The value of the phosphate content of the sample is obtained by subtracting the value of the silica content from the value of the combined content of silica and phosphate. The silica content and phosphate content of the sample are reportable.

In the aluminum powder product (1), the BET specific surface area of the powder product (1) is 0.16 m < 2 > / g or more, the phosphorus concentration of the entire powder product (1) as measured by a molybdenum blue method is 1 * 10 <-3 > mass% or more, and the ratio of the P2s peak intensity IP2s at 191.5 eV to the Cl2p peak intensity ICl2p at 199.0 eV, IP2s / ICl2p, in the photoelectron spectroscopy of the powder product (1) as measured by an X-ray photoelectron spectroscopy (XPS) method is 1.00 or more.

This invention proposes an online monitoring method for total arsenic in water, comprising the following steps: mixing a water sample with a potassium persulfate aqueous solution and heating to digest it, oxidizing all forms of arsenic to pentavalent arsenic; adding sulfuric acid and tartaric acid to the digestion solution to adjust the pH to 12, and adding ascorbic acid and potassium iodide to complex copper ions, adding potassium borohydride to generate arsine, and purging with air to remove the arsine; introducing the arsine into an iodine and potassium iodide aqueous solution to oxidize it to arsenate, then adding ammonium molybdate to generate arsine molybdenum heteropolyacid, and again adding ascorbic acid and potassium iodide to reduce it to molybdenum blue; measuring the absorbance and plotting a standard curve to calculate the total arsenic content. By using an iodine-potassium iodide solution as the arsine absorption solution, the absorption efficiency and stability are superior to conventional acidic potassium permanganate solution; simultaneously, tartaric acid masks antimony ions, and ascorbic acid and potassium iodide synergistically complex copper ions, effectively eliminating Sb. 3+ / Cu 2+ Interference can be eliminated to achieve accurate online monitoring of total arsenic in water.

The invention discloses a preparation method of molybdenum blue, and belongs to the technical field of vacuum metallurgy, a molybdenum source is placed in a corundum crucible, a vacuum furnace is used for vacuum roasting, and molybdenum blue with different oxygen vacancy contents is obtained by regulating and controlling temperature, heat preservation time and a condensation circulation path; according to the method, the characteristic that molybdenum trioxide is volatile is utilized, lattice oxygen in molybdenum oxide is separated under the vacuum condition, oxygen vacancies are formed, lattice distortion is generated, and the content of the oxygen vacancies in molybdenum blue can be regulated and controlled by controlling the temperature, the heat preservation time and the condensation circulation path in the process; according to the method, one-step synthesis of the molybdenum blue with the quantitative oxygen vacancy from the complex molybdenum calcine is achieved, the method is also applicable to pure MoO3, accurate temperature regulation and control are not needed, the process is simplified, the influence of extra ion doping is avoided, and a new thought for synthesizing the molybdenum blue with the oxygen vacancy is provided.