Solid powder samples deposited In a graphite tube furnace are vaporized and introduced Into a magnetron rotating direct-current arc plasma. The arc plasma has the form of a radial current sheet that completely covers the end of the graphite anode. The sample vapor from the graphite furnace Is forced to pass through the current sheet. This ensures adequate sample-plasma interaction and results In detection limits in the microgram/gram range. Analytical data will be presented for pure solid powder samples and for a number of NIST biological reference materials. Percent error values for the determination of various metallic elements using the method of standard additions ranged from 1.2% to 19.6%. Absolute detection limits at the subnanogram level are reported.