Spectroscopy

With all these features the system is ready for operation whichever sample should be analyzed, aqueous solutions or organic solvents in the concentration range of % down to µg/l. The optimization of all system parameters takes care on maximum energy and highest sensitivity, that means with an automatic flame optimization or burner positioning function the instrument meets every sample.

The quantitation of multielements in ultra trace concentration levels is done on the AA-6300 in combination with a digital controlled Graphitefurnace GFA-EX7. In this combination the instruments works on a maximum energy level and electronics double beam stability. The digital furnace with high sensitivity and intelligent temperature control results in detection limits (acc. to DIN 51401/1)which are almost out of imagination. The detection limit for lead in furnace measured according to 3 sigma is 0,085 µg/L using an injection volume of 20 µL, resulting in an absolute value of 1,7 pg. Furthermore this furnace concept guarantees extremely long graphite tube lifetimes (2000 shots at 2800 °C and an HNO₃ acid concentration of 0,1 % in aqueous solution). Table 1 shows typical detection limits of elements in graphite furnace operation using an injection volume of 20 µL.