Hydrogen sulfide-methylene blue spectrophotometry Key words: methylene blue spectrophotometry; hydrogen sulfide; mass spectrometer ; UV-1100; UV-1200
With the increasing pollution of surface water, traditional water treatment processes have made it difficult to purify water to meet drinking water standards. In recent years, activated carbon filters have received more and more attention as a deep processing unit. After the long-term operation of the activated carbon filter process for treating different water quality, the activated carbon gradually reaches the maximum adsorption capacity, and the adsorption capacity of the filter material...
I. Introduction Potassium feldspar is a potassium rocks, potash potential resources. China's potassium feldspar reserves are huge, mainly distributed in Shanxi, Shandong, Sichuan, Anhui and Xinjiang provinces [1] . The extraction of soluble potassium from potassium feldspar by high temperature thermal decomposition is an important method to develop and utilize potassium feldspar resources. Generally, it is necessary to add decomposition aids for melting, and domestic researchers have done...
Nissl staining solution (methylene blue method) Product introduction: The neuronal cell body includes a large cell nucleus with a wrinkled nuclear membrane, sparse chromatin, and a distinct nucleolus. The cytoplasm in the cell body is a Nissl particle, an basophilic particle capable of representing a rough endoplasmic reticulum and producing a specific speckled basophilic expression in many neurons. Nissl particles can be marked with many dyes such as neutral red, methylene blue, toluidine blue...
Food safety analysis workflow Thermo Scientific Life Science MS not only has a long tradition of technology, but also continues to innovate. Quadrupole mass analysis of true conjugate hyperboloids that fits the perfect theoretical electric field of a textbook is used on all TSQ® triple quadrupole mass spectrometers. Since launching the world's first triple quadrupole MS/MS (TSQ®) mass spectrometer in 1980, TSQ® triple quadrupole mass spectrometer has been widely used in environmental...
Caustic soda Last week, the domestic market was tight and the price oscillated slightly. The market price of 30% diaphragm alkali in North China market reached 600 yuan (ton price, the same below), and the transaction price was about 570 yuan; 96% protopine ex-factory price was 2,700 yuan. Henan market 30% diaphragm base quotes about 510 yuan. East China market 30% diaphragm base price is still 550 ~ 650 yuan. Liquid Chlorine Last week, liquid chlorine prices in some parts of the country fell...
WASHINGTON (reporter Feng power) July 4, AQSIQ quality sampling results released earlier this year with a base of 26 enterprises in Tianjin, Shanxi, Jiangsu and other 10 provinces and cities in the production of ammonium chloride. The total sampling pass rate is 94.1%. At the same time, the information also showed that at present, China's ammonium chloride output has accounted for 95% of the world's total production, while consumption accounts for 89% of the world total. When the...
We know that methylene blue can be used to make inks and lakes, as well as dyeing biological and bacterial tissues. It can also be made into double salt with ZnCl2, which can be used for dyeing cotton, hemp, silk fabrics, paper and bamboo and wood. In addition, it can be mixed with basic violet 5BN and yellow dextrin in a ratio of 78: 13: 9 to form basic royal blue. The use of methylene blue is multi-faceted. In our company, it is used for scientific research. Apart from the use of methylene...
Shandong Heda Co., Ltd. adopts a one-step new process to develop hydroxypropyl methyl cellulose and put it into mass production. The products' indexes meet the national standards. The product has a good dispersion, emulsification, thickening, bonding, moisture retention and other characteristics, widely used in synthetic resins, construction, pharmaceuticals, household chemicals, food, textile, paper, oil production and other fields. At present, domestic manufacturers use batch-type liquid...
The spherical magnesium chloride-supported polypropylene catalyst independently researched and developed by the China Petroleum Institute of Petroleum and Petrochemicals successfully conducted a pilot test last week on the polypropylene 75 kg/h polypropylene unit. This trial produced a total of two grades of polypropylene products, namely high-melt homopolymer polypropylene and high-melt high-impact polypropylene. In the pilot test process, the self-made spherical catalysts have good...
Introduction: Why export of electronic products, furniture, wood products, weaving, leather goods, food, machinery, glass and other industries must use containerized desiccant to prevent moisture and dehumidification, because in the marine transportation process, the marine environment is very special. Frequent changes in temperature cause problems with condensation, in which hot water contains more moisture than cold air. When the temperature inside the container is reduced to the dew point of...
PVC, the full name is Polyvinylchlorid, main ingredients for polyvinyl chloride (PVC), in addition to join other ingredients to enhance its heat resistance, toughness, ductility, etc. This kind of the surface film of the top is paint, the middle of the main component is polyvinyl chloride (PVC film), bottom is coated adhesive back. It is in the world by love, is very popular and widely used a synthetic material. Its global usage in various kinds of synthetic materials in high in the second. Due...
English name: L-Lysine acetate salt; (S) -2,6-Diaminohexanoic acid Other names: L-Lysine Acetate; L-2,6-Diaminocaproic Acid Acetate CAS number: 57282-49-2 C8H18N2O4 = 206.24 Level: BR Content: ≥98.5% Specific rotation: + 8.5 ～ + 10.01º PH: 6.5 ～ 7.5 Heavy metals: ≤10ppm Loss on drying: ≤0.2% Properties: white crystal or crystalline powder. Uses: biochemical research. Save: RT, protect from light
English name: L-Lysine acetate salt; (S) -2,6-Diaminohexanoic acid Other names: L-Lysine Acetate; L-2,6-Diaminocaproic Acid Acetate CAS number: 57282-49-2 C8H18N2O4 = 206.24 Level: BR Content: ≥98.5% Specific rotation: + 8.5 ～ + 10.01º PH: 6.5 ～ 7.5 Heavy metals: ≤10ppm Loss on drying: ≤0.2% Properties: white crystal or crystalline powder. Uses: biochemical research. Save: RT, protect from light
Recently, it was learned from Qingdao Alkali Industry Co., Ltd. that after more than six months of hard work, the pilot company's self-developed intellectual property soda-calcium chloride co-production new technology pilot test has been successful. Yu Yingming, deputy general manager of the company, said that the soda ash system energy-saving emission reduction technology upgrade project (abbreviated as the new process) to calcium chloride concentration reached 40%, light ash energy...
[Text|High-tech LED reporter Xiong Yuheng] At present, LED packaging methods mainly include planar packaging and die-top packaging. Because of its simple operation and low packaging cost, planar packaging is widely used by small and medium-sized packaging companies. However, the drawback of this packaging method is that the light efficiency and luminous flux are low, which is not comparable to the products packaged by the lens packaging process. The die top package belongs to the traditional...
English name: Amino black 10B; Buffalo black NBR; Acid black 1 Other names: naphthol blue black; buffalo black NBR; acid black 1; aniline blue black; acid black 10B; acid blue black 10B; acid glaucoma blue 10B; 4-amino-5-hydroxy-3- (p-nitrobenzene Azo) -6- (Benzazo) -2,7-naphthalene disulfonic acid disodium salt; naphthalene blue black CAS number: 1064-48-8 C22H14N6Na2O9S2 = 616.49 Level: High Purity Grade Em (Lambda Max, Water):> 28500 Lambda Max (nm): 615 ～ 621 Properties: blue black or...
English name: Methyl violet; Dahlia B; Basic violet 1; Pyrokatanium blue; CI42535 Other names: Methyl Qinglian; Basic Violet 1; Methyl Violet 2B; Aniline Violet; Basic Violet 1; Nail Violet CAS number: 8004-87-3 C24H28ClN3 = 393.95 Level: BS Biological staining test: qualified pH color change range: pH 0.13 (yellow) ~ 0.5 (green); pH 1.0 (green) ~ 1.5 (blue); pH 2.0 (blue) ~ 3.2 (purple) Properties: Green shiny crystalline powder. It is a mixture of tetramethyl, pentamethyl, and hexamethyl...
English name: HPMC; MHPC; Hydroxy propyl methyl cellulose; (Hydroxypropyl) methyl cellulose Other names: hypromellose; cellulose hydroxypropyl methyl ether CAS number: 9004-65-3 Grade: Medium viscosity Viscosity: 4000 ～ 6500mpa • s Water insoluble matter: ≤0.5% PH: 6.0 ～ 8.5 (2% aqueous solution) Heavy metals: ≤20ppm Properties: white to off-white fibrous powder or granules. Soluble in water, insoluble in hot water, soluble in DMF, DMSO, hot ethylene glycol and pyridine, insoluble in absolute...
China's Ministry of Commerce announced on the 14th that the anti-dumping measures for the import of methylene chloride will expire soon. Domestic companies or natural persons, legal persons or related organizations that represent domestic industries may apply for final review within a certain period of time. According to the Ministry of Commerce's announcement, according to Article 48 of the Anti-dumping Regulations of the People's Republic of China, the deadline for the collection of...
Abstract In this paper, capillary column gas chromatography is used to determine the content of each component in the tail gas water wash produced by the oxidation of o-xylene to produce phthalic anhydride. The method is simple and fast, and has high accuracy. In the production of tail gas washing liquid to recover maleic anhydride and other phthalic anhydride by-products, it has an important guiding role in the control of process indicators. Introduction The tail gas water wash produced by the...
This standard is applicable to the determination of hydrocarbon impurities in coking toluene, including benzene, C8 aromatic hydrocarbons and non-aromatic hydrocarbons up to n-nonane. The measurement range of each group of impurities is 0.01 ～ 3.00% (m / m) This standard refers to the use of ISO5279-80 "Gas Chromatographic Determination of Hydrocarbon Impurities in Toluene". 1 Test principle A known amount of internal standard is added to the sample, and a certain amount of the mixture is...
【China Aluminum Industry Net】Polyaluminum chloride water purification agent is a polyhydric, multi-nuclear complex cationic inorganic polymer flocculant. In the hydrolysis process, a series of physical and chemical processes such as agglomeration, adsorption and precipitation can occur, but the pH of the water is not changed, and the purpose of purifying the sewage is achieved. The sewage discharged from the rubber factory is colorless, but it is turbid and accompanied by odor. The surface of...
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