A microwave-induced argon plasma system suitable for trace analysis

A non-flame cell utilising a microwave-induced argon plasma at atmospheric pressure is described for emission spectroscopie purposes. The system operates at a microwave power of ca. 40 W (2450 MHz) and requires the use of only minute liquid samples. Optimal operating parameters are investigated and the method is tested on a range of elements. In addition, the use of a high-speed operational amplifier/integrator is described which is capable of following the weak and transient signals common to non-flame methods of atomisation.