baoyu135国产精品免费_成人精品视频一级毛片_亚洲中字无码A∨电影在线观看_国产免费高潮白浆二区三区_免费视频在线观看高清无码_精品无码久久国产2024_亚洲AV无码专区牛牛影院_精品第一国产综合精品aⅴ_午夜大片爽爽爽免费影院_日本在线高清视频

Grade 1 Ammonium Paratungstate (APT-1)

Grade 1 ammonium paratungstate is a national standard product of APT with grade of APT-1. The ammonium paratungstate may be obtained by the process of losing ammonia in ammonium tungstate solution. Its chemical equation is as follows:
12(NH4)2WO4→5(NH4)2O?12WO3?nH2O+(7-n)H2O+14NH3↑grade 1 ammonium paratungstate picture
Ammonium tungstate solution is not stable, so that water and ammonia escape when it is heated, and therefore ammonium paratungstate is continuously generated in solution. During this process, ammonium paratungstate changes from unsaturation to saturation to reach a stable state. Under the mutual action of homogeneous nucleation and heterogeneous nucleation, crystal nucleus is formed, and the crystal nucleus grows and becomes crystal. The purity of the ammonium tungstate solution should be improved to make homogeneous nucleation dominant, thereby reducing the nucleus formed by impurities and increasing the particle size of APT.

In the process of crystallization, particle size of APT may be affected by a lot factors such as relative supersaturation, temperature, stirring speed, impurity content, evaporation rate, and homoionic effect.

More details, please visit:
http://www.ammonium-paratungstate.com/english/index.html

Comments are closed.

Address: 3F, No.25-1 WH Rd., Xiamen Software Park Ⅱ, FJ 361008,China Copyright ? 1997 - 2024 CTIA All Rights Reserved
Phone:+86-592-5129696,+86-592-5129595;    Email: [email protected]
舊版