Table 2: Thermal decomposition temperatures for the mercury compounds [31].

Mercury compounds Decomposition
temperature ranges/°C
Peak temperatures/°C
HgCl2 70~220 120±10
Hg2Cl2 60~220 80±10
HgBr2 60~220 110±5
HgS(black) 170~290 205±5
HgS(red) 240~350 310±10
HgSO4 500~600 540±20
Hg2SO4 120~480 280±10
HgO 200~480 430±15

The Hg release ratio at each heating condition was calculated using Equation (2):