Physikalische und chemische prozesse bei der atomabsorptionsanalyse mit graphitrohröfen—I : Messbedingungen, versuchsanordnung und temperaturmessungen

This is part I of a communication that consists of 3 parts and deals with physical and chemical processes occurring during the atomic absorption analysis with graphite furnaces. The processes are time-dependent because restricted amounts of sample are used. In addition, they are temperature-dependent.In this part, mainly the important measuring conditions are discussed and the experimental facilities are described. Some characteristic examples of the processes are given to draw attention to those processes that should be taken also into consideration when analytical procedures are developed. Such processes are emission by atoms, molecules and radicals, absorption by molecules and radicals, and thermochemical reactions with the furnace material, e.g., formation of intercallation compounds with graphite.In order to study the dependence of the various processes on temperature, different methods for measuring temperatures have been tested as to their suitability and two methods have been applied for measuring the furnace and the plasma temperatures.