10 results about "Potassium chromate" patented technology

The embodiment of the invention relates to a method for measuring the chloride ion concentration in water-based drilling fluid, which comprises the following steps: acquiring the voltage of a chloride ion sensor in various standard liquids with known concentrations at a preset constant temperature, and establishing a calibration corresponding relation between the voltage and the chloride ion concentration; diluting a to-be-detected water-based drilling fluid sample into a to-be-detected mixed solution according to a fixed proportion; and maintaining the to-be-measured mixed solution at the constant temperature, measuring the voltage of the to-be-measured mixed solution by using a chloride ion sensor, determining the concentration value of the to-be-measured mixed solution based on the calibration corresponding relation, and calculating the actual chloride ion concentration value of the water-based drilling fluid by combining the fixed proportion. According to the embodiment, a traditional chemical titration agent is abandoned, the potential safety hazard that an operator makes contact with toxic strong acid and carcinogenic potassium chromate is eliminated, the water-based drilling fluid to be detected is adjusted to the optimal linear range of a chloride ion sensor through quantitative dilution, and the detection efficiency and timeliness are greatly improved.

The application discloses a kind of light absorption material glass for high-definition ultra-short inverter and preparation method thereof, and the light absorption material glass includes the following weight percentage components: quartz sand 40-50%, boric acid 6-12%, alumina 7-15%, sodium carbonate 1-10%, potassium carbonate 1-10%, lithium carbonate 0-2%, basic magnesium carbonate 0-3%, calcium carbonate 0-5%, barium nitrate 1-3%, zirconium oxide 0-3%, copper oxide 1-3%, potassium permanganate 3-6%, potassium chromate 0.2-1%, diiron trioxide 1-5%, cobalt trioxide 1-6%, nickel oxide 1-6%, vanadium pentoxide 1-6%, cerium oxide 0-1%. The light absorption material glass of the application is used for preparing ultra-short inverter, which can effectively improve the transmittance and resolution of ultra-short inverter.

The invention belongs to the technical field of nano materials, and particularly relates to a preparation and transfer method of an inclined chromic oxide single-crystal nanosheet. The preparation method specifically comprises the following steps: uniformly mixing potassium chromate and chromic chloride to obtain precursor powder; transferring the precursor powder into a porcelain boat, and covering the surface of the precursor powder with a molecular sieve; enabling the oxide layer of the SiO2 / Si substrate to face downwards and obliquely cover the molecular sieve; and then transferring into a vacuum tube furnace, heating and reacting, and cooling to obtain the inclined chromic oxide single crystal nanosheet on the surface of the SiO2 / Si substrate. The inclined chromium oxide single crystal nanosheet is placed on other clean substrates, and the chromium oxide single crystal nanosheet is transferred to other clean substrates through mechanical pressing. The method provided by the invention has the advantages of good controllability, good repeatability, high yield, low cost, no pollution in transfer and the like.

The invention discloses a method for determining the content of free chlorine in a chlorine-containing organic matter, which comprises the following steps: a) mixing a sample to be detected with the volume of V sample and a water-insoluble organic solvent to form a mixed organic phase, then adding a water phase containing neutral salt or a phosphate buffer solution with the pH value of neutral with the volume of V water, and oscillating; b) after standing and layering, separating a water phase; c) adding a potassium chromate indicator into the water phase with the volume of Vwater ', titrating with a silver nitrate standard solution with the concentration of C until the water phase becomes red, and recording the volume V of the consumed silver nitrate standard solution; d) blank test: under the condition of not adding the sample, repeating the steps a) to c), and recording the volume V0 of the consumed silver nitrate standard solution; and e) substituting the obtained V sample, V water, V water ', C, V0 and V into the following formula to calculate the free chlorine content WCl. According to the method, through a specific organic medium environment, effective separation of free chlorine and main interferents is realized, and the determination is accurate.

The invention discloses a chloride ion-free esterified fiber micro-smoke firecracker medicament and a preparation method thereof. Comprising sodium bicarbonate, potassium hydroxide or sodium hydroxide, castor oil, methyl acetate, ethyl formate, ferrocene, manganese dioxide, potassium dichromate and corncob powder fibers. The invention relates to an environment-friendly environment-friendly detergent, which is characterized by comprising 15-25 parts by weight of sodium bicarbonate, 4-10 parts by weight of potassium hydroxide or 8-12 parts by weight of sodium hydroxide, 12-22 parts by weight of castor oil, 25-35 parts by weight of methyl acetate, 25-35 parts by weight of ethyl formate, 6-8 parts by weight of potassium dichromate, 10-22 parts by weight of ferrocene, 2-5 parts by weight of manganese dioxide, 100-200 parts by weight of corncob fiber, and 6-8 cubic meters of water. The preparation method comprises the following steps: crushing a fiber coarse material, soaking in a pool, boiling, rinsing, carrying out centrifugal spin-drying, air-drying, squeezing, distilling, carrying out esterification reaction, adding elements such as potassium, sodium, iron, manganese and the like, sieving, mixing and the like to prepare a finished product. The invention has the advantages of no chlorine salt and sulfide, slight smoke, no toxicity, no pungent smell, no harm to human body, safety, environmental protection and the like.

The invention relates to a method for measuring iron content in a sodium ferric phosphate material, which comprises the following steps: weighing a sodium ferric phosphate material sample to be measured, adding carbon quantum dots, and uniformly grinding to obtain mixed powder; adding the mixed powder into a hydrochloric acid solution, heating for dissolving, cooling to room temperature after the powder is completely dissolved, and filtering to obtain filtrate to be detected; adding a sodium tungstate indicator into the filtrate to be detected, then adding a titanium trichloride solution until the solution becomes stable light blue, and then adding a potassium dichromate standard solution until the light blue disappears and the solution becomes colorless; adding sulfur-phosphorus mixed acid and a sodium diphenylaminesulfonate indicator into the colorless solution, titrating by using a potassium dichromate standard solution until the solution is kept in a light purple state for more than 30 seconds and does not fade, and recording the volume V of the potassium dichromate standard solution consumed by titration; and calculating the iron content according to a formula. According to the method disclosed by the invention, iron in the sodium ferric phosphate material can be rapidly detected, and the accuracy is high.

This application relates to the field of environmental monitoring and water quality analysis technology, and in particular to a mixed reagent, test reagent tube, and digestion method for COD detection of petrochemical wastewater. The components, by mass percentage, are: sulfuric acid 75.0–90.0%, potassium dichromate 0.5–1.0%, silver sulfate 1.0–2.7%, scandium sulfate 0.01–0.07‰, potassium hydrogen phthalate 0.1–0.25‰, glucose 0.1–0.25‰, with the remainder being pure water; the mixed reagent does not contain mercuric sulfate. This application enables mercury-free and highly efficient digestion of high-salt, high-organic-content petrochemical wastewater, improves the oxidation efficiency of benzene compounds and polycyclic aromatic hydrocarbons, reduces the detection limit to below 5 mg / L, and the wastewater is easy to treat, combining high accuracy with environmental friendliness.

The invention discloses purple ceramic ink as well as a preparation method and application thereof. The purple ceramic ink is prepared from the following raw materials: metastannic acid, light calcium carbonate, quartz powder, potassium dichromate, calcium fluoride, potassium chromate, a solvent and a dispersing agent. When the purple ceramic ink is used for preparing domestic porcelain, bright purple can be generated, the color development effect is good, and the color development requirement of the domestic porcelain can be met.

Methods and compositions for rapid verification of cleaning performance on surfaces in cleaning-in-place (CIP) systems and in cleaning-in-place (COP) systems and in high flow areas. The solution comprises alkali metal hydroxide; one or more oxidizing compounds, wherein the one or more oxidizing compounds comprise sodium hypochlorite, potassium hypochlorite, sodium persulfate, potassium persulfate and monopersulfate; and one or more compounds selected from the group consisting of potassium permanganate, sodium permanganate, potassium dichromate, and sodium dichromate. In some examples, the solution also includes potassium tripolyphosphate, sodium tripolyphosphate, or other tripolyphosphate. The substrate is in contact with the solution, and a chromogenic reaction may occur indicating the presence of an organic substance or non-organic contaminant. The chromogenic reaction may occur within less than 30 minutes and at a temperature of 10 DEG C to 60 DEG C.

The invention discloses an organic chlorine content analysis method based on an oxygen bomb combustion-silver nitrate titration method, and relates to the technical field of assay analysis. The method comprises the following steps: sample pretreatment, oxygen bomb combustion digestion, preparation before titration, silver nitrate titration, blank test and content calculation: carrying out oxygen bomb oxygen-enriched combustion on a pretreated sample, converting organic chlorine into chloride ions, absorbing the chloride ions by deionized water, adding a potassium chromate indicator into a digestion solution, and titrating with a standard silver nitrate solution, and calculating the organic chlorine mass fraction through blank test correction. Combustion and titration conditions are optimized, digestion is thorough, operation is easy and convenient, cost is low, precise instruments are not needed, detection precision is high, repeatability is good, the method is suitable for detection of solid and liquid organic samples, and batch conventional detection requirements of primary laboratories are met.