Several modifiers were tested for efficient thermal stabilization of thallium such as Pd (80 μg), ascorbic acid (200 μg), and Pd mixture with ascorbic acid (80 μg Pd + 200 μg ascorbic acid). As can be seen in Fig. 1. Pd deposited (Pdc) on the tube wall + Pd(aq) + ascorbic acid(aq) was shown to be superior and chosen as an efficient modifier. Graphite tubes were pretreated using 40 μl of 0.1% Pd solution injected into the tubes and conditioned at a temperature of 1800 °C. This procedure was repeated two times, resulting in a total mass of 80 μg of Pd deposited (Pdc) on the tube wall. The sample and modifier solutions containing 20 μl of Pd2+ (0.1%, w/v) and 20 μl of ascorbic acid (1% w/v) were subsequently injected into the graphite furnace. This modifier system shows low detection limits, high sensitivity and long lifetime