The main objective of this work is to investigate the influence of scrubber parameters on mercury re-emission to establish effective measures for mercury removal. The effects of key parameters, such as gas components (N-2, O-2, CO2, SO2, NO, NO2), slurry temperature, gaseous mercuric chloride (HgCl2) concentration, different slurry solution (water, KCl, KOH, Na2S and Ca(OH)(2)) and even the scrubbing process of the lab-scale scrubber experimental testing were carried out. The results obtained point to SO2 as the most critical parameters for inhibition of mercury re-emission and other variables appears to impact on re-emission.