Pretreatment of soil samples (1
Time of Update: 2022-03-09
2. Lithium carbonate-boric acid, graphite powder crucible melting methodIt is suitable for the analysis of aluminum, silicon, titanium, calcium, magnesium, potassium, sodium and other elements .
142 seawater desalination projects have been completed in my country
Time of Update: 2022-02-17
As of the end of 2018, the nationwide desalination projects were distributed in cities and islands with severe water shortages in 9 coastal provinces and cities .
Mainly distributed in Zhejiang, Guangdong and other places, with 100-ton and 1,000-ton projects as the main ones .
Other ways to change lignin
Time of Update: 2021-11-14
The introduced hydrophobic sulfide group not only reduces the water solubility of lignin, but also increases the selective adsorption capacity of lignin to metal ions, and the adsorbed metal ions It can be parsed relatively easily .
The first dinosaur-era crab completely preserved in amber: A completely preserved Cretaceous crab fossil was discovered from a piece of amber in Yunnan
Time of Update: 2021-11-02
This study used micro-CT to examine in detail a modern crab approximately 100 million years ago, Cretapsara athanata, preserved in amber.
Product standard for the process flow of ethyl chloroacetate
Time of Update: 2021-08-14
2. Production principleIt is obtained by direct esterification of chloroacetic acid and absolute ethanol .
6. Production processPut 950 kg of chloroacetic acid and 217 kg of anhydrous ethanol into the esterification reactor, and heat to reflux with stirring.
Solubility product rule in precipitation dissolution
Time of Update: 2021-06-18
Solution The concentration of each substance after mixing the two solutions in equal volume isIn NH 3 ·H 2 O-NH4 + mixed solutionSince Q Θ >Ksp Θ , Mg(OH) 2 precipitation can be generated .
Sinopec's environmentally friendly epichlorohydrin new process technology is the world's first
Time of Update: 2021-05-01
Distillation separation, catalyst life inspection, catalyst online regeneration and other process research have opened up the entire process, developed a new green and clean production process of epichlorohydrin, and developed a 50,000-ton/year process package for the first time.
Shanghai Municipal Market Supervision and Administration Bureau 12th Provincial Food Safety Sampling Inspection Information in 2021
Time of Update: 2021-04-09
For the unqualified products found in the above-mentioned random inspections, our bureau has requested the relevant district market supervision administrations to promptly investigate and deal with unqualified foods and their producers and operators, investigate and deal with them in accordance with the law, and further supervise the enterprises to perform their legal obligations, and record the relevant information Food safety credit files of food producers and operators.
Study: Food ingredients affect release of tonsil skin polyphenols
Time of Update: 2021-02-04
food ingredients will significantly affect the tonsil skin polyphenol class substances in the human stomach and heteum environment biological utilization rate.
the presence of ingredients, it can significantly affect the biological utilization rate of polyphenols class substances in the tonsil skin in the human stomach and heteary environment.
The greening of rubber additives can be promoted in four aspects
Time of Update: 2021-01-26
In the author's opinion, the greening of rubber additives can be promoted from four aspects, such as promoting product greening, developing clean production process, promoting effective "three waste" governance model and speeding up the integration of the industry.
Technological innovation in the production of wood paint
Time of Update: 2021-01-02
Yang Xianghong - Managing Director of Guangzhou Kaiton Business Consulting Co., Ltd. Liu Jianxin, Li Lei - Beijing Polytechnic University Materials Institute Abstract: In many wood paint, water-base
Time of Update: 2020-11-05
Generally can be divided into four parts: root crown, growth point, elongal area and root hair area.
The root crown is enclosed outside the growth point and is a of .
A hundred dishes are not as good as cabbage
Time of Update: 2020-09-15
White vegetable moisture content of as high as 90%, but the calories is very low, a cup of cooked of cabbage juice can provide almost as much calcium as a glass of milk, winter eating big white dishes can effective to supplement the water lost due to dry weather, can play a good skin care and gravy effect.
Home paint "oil to water", three factors lead to the promotion of difficult
Time of Update: 2020-09-05
Last July, Beijing, Shenzhen and other places promulgated new regulations, requiring wooden furniture to reduce the use of oily paint, gradually replaced with water-based paint, that is, "oil-to-water." However, nearly a year after the implementation of the standard, furniture paint "oil to water" status quo is not optimistic: cost, price, market acceptance and other aspects have encountered a series of obstacles.
Paint knowledge | price introduction of Chenyang water paint difference between Chenyang water paint and emulsion paint
Time of Update: 2020-04-03
Core tip: Chenyang water paint is the paint with water as diluent It has the characteristics of energy conservation, environmental protection, non combustion and non explosion, ultra-low emission, low