1-10　Chemical forms of mercury in fly ash

Abstract

Chemical forms of mercury in fly ash produced from the coal-fired power plant were analyzed. A combination of temperature programmed desorption (TPD) and cold vaper atomic absorption spectrometry (CVAAS) was applied to clarify the chemical forms of mercury. The mercury forms were determined by comparing to the peak temperature and linear combination of TPD curves of model mercury compounds. The results showed that abundance ratio of mercury forms differed depending on the fly ash. Even if the amount of mercury in fly ash was less than few ppm, the combination of TPD and CVAAS could be applied for qualitative and quantitative analysis of mercury in fly ash.