Die potentiometrische Mikrobestimmung von Nickel in organischen Verbindungen nach Verbrennung in einem modifizierten Sch�niger-Kolben

Potentiometric Microdetermination of Tungsten in Organic Compounds after Combustion in a Modified Oxygen Flask

“…Without boiling the basket, the recoveries of W are poor. It is therefore necessary to use an oxygen flask with detachable Pt basket (15,16) absorption solution (3 ml of 1 M NaOH). Boiling of the absorption solution for a few minutes as described under Procedure ensures then a complete dissolution of WO 3 .…”

“…A modified oxygen flask, described previously (15,16), consisted essentially of a 300-ml round-bottom flask, provided with a short test tube sealed to its bottom and equipped with a ground stopper to which an original detachable U-shape Pt basket was connected.…”

Organic elemental analysis

“…Diehl et al (42) determined lead in tetraalkyllead compounds by atomic absorption spectrometry. Campiglio (43) decomposed organonickel compounds by closed flask combustion; oxides of nickel deposited on the walls of the flask were dissolved by boiling, and Ni2+ was determined by titration with 0.01 M sodium diethyldithiocarbamate potentiometrically using a S2 selective electrode.…”