The pyrolysis experiments with or without phosphoric acid pretreatment of Sedum spectabile were conducted at different temperatures in a tube furnace to study the migration characteristics and speciation distributions of As and Pb. The results showed that the recovery rate of As fluctuated and the recovery rate of Pb was increased firstly and then decreased with the increase of temperature. The recovery rate of As and Pb both reached maximum at 500℃ with 66.2% and 73.08% respectively. The recovery of As and Pb was increased after adding 8% phosphoric acid in a certain temperature range and reached maximum at 300℃ with 83.75% and 92.78% respectively. When the pyrolysis temperature was increased from 300℃ to 600℃, the stable form (F4 + F5) of As in biochars was increased from less than 20% to about 70%, and the most stable form (F5) of Pb was increased from 3% to 32%. After the pyrolysis with 8% phosphoric acid pretreatment, the stability of As in biochar was increased slightly with F5 increasing by 20% and 5% respectively at 500℃ and 600℃; and the stability of Pb was increased remarkably with (F4 + F5) reaching more than 90%. The dosage of phosphoric acid had no significant effect on the distribution of heavy metals. These results indicated that phosphoric acid pretreatment could be used for pyrolysis of phytoremediation plants to increase the recovery and stability of heavy metals in the biochars. In the meantime,the potential ecological risk index was also reduced.
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