Dissolution agent

Biliary lithotriptor used in conjunction with dissolution agent. 

The dissolution agents used for soil and sediment samples are very diverse, and the analytical chemist must understand thoroughly the chemistry underlying the dissolution process when using a particular reagent. Although the most common dissolution agent is water, there are many situations where water may be unsatisfactory. 

Crospovidone as disintegrant and dissolution agent for tablets, granules and hard gelatin capsules... 

It can be concluded that the efficacy of the use of a normal or a micronized crospovidone as disintegrant and dissolution agent depends on the formulation but usually the normal grades disintegrates faster than the micronized grades. 

The formation and subsequent aging of the metal hydroxide surface precipitate can have a significant effect on metal release. In Figure 3.8 one sees that as residence time (aging) increased from 1 hour to 2 years, Ni release from pyrophyllite, as a percentage of total Ni sorption, decreased from 23 to 0% when HNO3 (at pH 6.0) was employed as a dissolution agent for 14 days. This... 

This is essentially a corrosion reaction involving anodic metal dissolution where the conjugate reaction is the hydrogen (qv) evolution process. Hence, the rate depends on temperature, concentration of acid, inhibiting agents, nature of the surface oxide film, etc. Unless the metal chloride is insoluble in aqueous solution eg, Ag or Hg ", the reaction products are removed from the metal or alloy surface by dissolution. The extent of removal is controUed by the local hydrodynamic conditions. 

The cake produced by the digestion is extracted with cold water and possibly with some diluted acids from the subsequent processes. During the cake dissolution it is necessary to maintain the temperature close to 65°C, the temperature of iron sulfate maximum solubiUty. To prevent the reoxidation of the Fe " ions during processing, a small amount of Ti " is prepared in the system by the Ti reduction. The titanium extract, a solution of titanium oxo-sulfate, iron sulfate, and sulfuric acid, is filtered off. Coagulation agents are usually added to the extract to faciUtate the separation of insoluble sludge. 

---