抄録
The samle solution (2 μl) is placed on a tungsten loop filament (loop diam.of 1.8 mm, wire diam.of 0.2 mm), which is next slowly heated in a stream of agron (300 ml/min) by direct heating until the solvent is removed.By raising the filament temperature, the residue is evaporated and introduced into an electrodeless discharge (2450 MHz, 50 W), burning in a quartz capillary (1.6 mm i.d.) at atmospheric pressure.An 0.5-m Ebert mount spectrometer with an 1180 rulings/mm grating is used in conjunction with a micro-micro ammeter and a strip chart recorder.
Among various materials and shapes of the atomizer tested, the above-mentioned loop is best suited.The optimum temperature is different for each element, ranging from 800° to 1200°C.The influence of coexisting elements and acidity on the emission intensity of cadmium is investigated, and the relative freedom from interferences is demonstrated.The detection limits expressed in ng are: 0.01 for Ag (nitrate), 0.02 for Cu (sulfate), and 4, 0.004, 0.2 and 0.01 for Ba, Cd, Pb and Zn (chlorides), respectively.The relative standard deviations are from 2 to 16 per cent.
