Determination of total chromium in soil. Flame atomic absorption spectrophotometry (2)
Time of Update: 2022-03-09
>2. Preparation of the sample>(1) Total digestion method . >Accurately weigh 0. 2～0. 5g (accurate to 0
Unconventional, highly active chromium-based ammonia synthesis catalyst was discovered by Dalian Institute of Chemical Technology
Time of Update: 2022-01-10
of ammonia under relatively mild conditions . >Ammonia is not only the main raw material of nitrogen fertilizer, but also plays an important role in the storage and conversion
Becco Group has successfully developed a chromium-free primer product series, which will be officially launched at the end of this year
Time of Update: 2021-11-12
After more than 20 years of research and development, Becco's coils have accumulated rich and thin, and successfully developed the BeckryPrim chromium-free primer product series to empower
The harm of arsenic, chromium and copper to crops
Time of Update: 2021-09-07
Table 3-8 Chromium limit index in food copperHeavy metal copper is an essential element for the growth of crops.
Determination of Copper and Chromium by Atomic Absorption Spectrometry
Time of Update: 2021-09-06
/>>(2) Measuring principle . The full decomposition method of hydrochloric acid-nitric acid-hydrofluoric acid-perchloric acid is adopted to completely destroy
[Single cell automation powers drug development] Learn how Roche and Pfizer use Chromium Connect to optimize drug development
Time of Update: 2021-08-12
to lack of repeatability in results . However, by automating the single-cell gene expression process, pharmaceutical companies can standardize the library preparation process, thereby eliminating
10x Genomics launches Chromium X, a new generation of single-cell analysis platform
Time of Update: 2021-08-03
The new series includes Chromium X, which is a powerful and flexible instrument that can make millions of cell research routines .
The 8th Annual Meeting of the Second Chromium Pigment Branch of China Coatings Industry Association was held
Time of Update: 2021-07-24
of chromium pigments was 5,6190. 2 tons, a year-on-year decrease of 6. 48%, and the sales volume was 5,8237. 9 tons, a year-on-year decrease of 5. 25 %; sales were 1. 129 billion yuan. In 2015, the price
Zhongke Refining and Chemical Polyethylene Plant Converted to Chromium Catalyst Products
Time of Update: 2021-07-09
The chromium-based catalyst product HHM5502 has excellent rigidity and good processing performance.
The chromium-based catalyst was used for the first time in this device.
Divalent chromium, pentavalent chromium and tetravalent chromium compounds
Time of Update: 2021-06-30
1. Divalent chromium compoundsCr(II) anhydrous halides include CrF 2 (blue-green), CrCl 2 (white), CrBr 2 (white), and Crl 2 (red-brown), all of which are ionic compounds with melting points above 800°C .
Trivalent chromium compounds
Time of Update: 2021-06-30
Salts and coordination compoundsThe anhydrous trihalide CrF 3 (green), CrCl 3 (purple red), and CrBr 3 (dark green) solids are relatively stable and will not decompose when heated to the melting point .
The nature of elemental element of chromium subgroup
Time of Update: 2021-06-30
/>>Simple substance of chromium subgroup elements>1. The nature of the element>The melting point (1907°C) and boiling point (2671°C) of chromium
Hexavalent chromium compounds
Time of Update: 2021-06-30
Hexavalent chromium compounds include oxo acid salts ( chromate and dichromate), chromium trioxide (CrO 3 ) and chromoyl chloride (CrO 2 Cl 2 ) .
Influence of the particle size of the bottom layer powder on the performance of chromium carbide-nickel-chromium-aluminum-yttrium coating
Time of Update: 2021-05-07
1HV; while the bonding strength of the coating prepared by the fine particle powder is 58.
Rolled steel with a new type of organic hybrid thin coating without chromium
Time of Update: 2021-01-01
Coatings have been used on metal substrates for many years, mainly to improve the corrosion resistance, mechanical properties, physical operation and appearance of metals. Typical coatings include inorganic conversion coatings such as phosphate
The latest research and development of marine coatings with anti-corrosion pigments - environmentally friendly inorderable pigment iron chromium black
Time of Update: 2020-12-06
environmentally friendly inorderable pigment iron chromium black physical map EPA on the VOC emission limit of marine coatings, which inhibits the development of the entire marine coatings market.
The influence of paint film thickness and other factors on the determination of soluble lead and chromium content in coatings
Time of Update: 2020-11-28
, Sartorius; DHG-9075A type electric blower drying box, Shanghai Heng Scientific Instruments Co., Ltd.; QSX-21A thickness meter, Tianjin Construction Instrument Factory. reagents and solutions: hydrochloric acid, pure analysis, Beijing chemical
The development of water-based chromium-free zinc aluminum anti-corrosion coating
Time of Update: 2020-11-23
pigment. 1.2.2 Preparation of water-based chromium-free zinc aluminum coating 1) claims to take a certain quality pigment metal powder, so that Zn and Al (modified) mass ratio of 4:1, mixed evenly. 2) The metal mixture is slowly added
Science: The association between trace elements of vanadium, manganese, zinc, chromium, magnesium, selenium and diabetes.
Time of Update: 2020-10-10
trace elements, including zinc, chromium, radon and other transductive effects on insulin signals.
