Determination of kinetic parameters for atom formation at constant temperature in graphite furnace atomic absorption spectroscopy

Application of Langmuir theory of evaporation to the simulation of sample vapor composition and release rate in graphite tube atomizers. Part 2. Verification of the methodology and investigation of atomization of Ag and Cu

“…where -a estimation of enthalpy according to the stoichiometry of known metalcarbon compound. 9,30,32 The issues of kinetic theory were applied for explanation of ET AAS phenomena on the basis of assumption, 16 according to which the vaporization and vapor transport in the atomizer are independent processes. Thus, any particularities in the behavior of atomic absorption signal could be interpreted as changes of activation energy, pre-exponent or reaction order.…”

“…Fig.6Atomic absorption signals for Cu(1) and Ag (2) (nominal heating ramps 1500 and 500 K s À1 , respectively) and simulations (1 0 , 2 0 ) based on eqn (1), (8),(9) and the data on standard vaporization enthalpy and entropy from Table3.…”

“…Fig.10Simulation of vapor release rates for Ag (1-4) and Cu(5)(6)(7)(8)(9)(10)(11) in graphite tube under the consideration of interaction of metal vapor with graphite (reaction VII, eqn (1), (19) and (20)). The temperature approximations and constants used are reported in Tables1 and 3.…”