Sur la thermogravimétrie des précipités analytiques : Dosage du sodium

This thermogravimetric study has enabled the authors to specify a large number of points of detail in connection with the correct determination of sodium. Their attention has been particularly directed to the triple acetates, which they recommend should be weighed only in the form of pyro-uranates. The method of ball, less classical than the others, would merit greater attention on the part of analysts.     

Sur la thermogravimétrie des précipités analytiques : Dosage du Potassium

The authors have studied the pyrolysis of 10 compounds of potassium and defined the limits of temperature between which they must dried in order to be determined accurately by weighing. Apart from the hexanitritocobaltate, the use of which is restricted to volumetric and coloimetric analysis, it can be said that the 9 other salts examined are well suited to the determination of potassium, the hydrontertrate, used within the limits prescribed by the authors, merits special attention.     

La rèaction de parri et les sulfonamides

In der Parri's reaction certain sulphonamidcs give colourations which may lead to confusion with barbiturates. Sulphathiazole gives an intense violet colour; sulpliapyndine and sulphadiazinc give a weak violet colour.In the case of sulphathiazolc the colour is due to its coball(II) salt. In the presence of an excess of ammonia there is formed an insoluble rose-coloured product corresponding to the formula (Sulphathiazole) ₂Co(NH₃).3H₂O.     

A highly concentrated vanadium protic ionic liquid electrolyte for the vanadium redox flow battery

A protic ionic liquid is designed and implemented for the first time as a solvent for a high energy density vanadium redox flow battery.Despite being less condu...