Aquatic plant such as Salvinia molesta and Azolla microphylla are able to absorb heavy metals from aquatic environment. As the Senapelan River, a tributary of the Siak River in Pekanbaru is polluted due to anthropogenic activities, the aquatic plant living in that river may absorb heavy metals originated from the pollutant. To understand the Pb and Zn content in S. molesta and A. microphyl…