The element sulfur as a main product prevented acidification of the biological fixed bed, which maintained the stability of the operation.
元素硫作为主要产物防止了生物固定床的酸化，并保证脱硫装置的稳定性。
2
Excavation and trace element analysis indicates: Jehol biota experienced mass mortality and rapid burial; toxic gases of the volcanic activities are the main factors of biological catastrophic event.
The distribution of element in soil profile was related to the characteristics of elements, soil parent, topography, climate and intensity of geological leaching and biological accumulation.