This study attempted to measure the amounts of nickel, mercury and cadmium in leaves of Avicenna marina and sediments at
Persian Gulf port shoreline in Iran to investigate their use as bio-indicators. Mean concentrations of Hg (0.02±0.00 mg/kg), Cd
(0.79±0.13 mg/kg) and Ni (60.81±0.00 mg/kg) in the sediments were higher when compared with values registered in leaves to
each metal (Hg: 0.01±0.00 mg/kg; Cd: 0.13±0.03 mg/kg; and Ni: 1.47±0.35 mg/kg). Regression analysis showed a significant
association between accumulation of Ni and Hg in the leaves in relation with the concentration of these same metals in the
sediments (p<0.05). This fact was not confirmed for Cd (p>0.05). Results of thise study also demonstrated that leaves of
A.marina are not a proper accumulator for Ni and Hg. However, this was not available for Cd.