Surveying on decontamination Effect of Water Lily (Nymphaea Alba) for Heavy Metals (Pb, Cd and Mn) in Liquid Solution

Subject Areas : Water and Environment

Faramarz Moattar ¹ (Environment and Energy College, Department of Science & Research, Islamic Azad University, Tehran, Iran)
Elahe Javadi ² (Environment and Energy College, Department of Science & Research, Islamic Azad University, Tehran, Iran)
Abdolreza Karbassi ³ (Environment College of Tehran University, Tehran, Iran)
Seyed Massoud Monavvari ⁴ (Environment and Energy College, Department of Science & Research, Islamic Azad University, Tehran, Iran)

Received: 2008-01-30 Accepted : 2008-05-09 Published : 2011-03-21

Keywords: Heavy Metals, Accumulation, Phytoremediation, White water lily,

Abstract :

Population growth, industries development, water consumption increase of lotic water Pollution due to the lack of controlling output waste water of manufacturing plants, municipal and agricultural areas has decreased water quality. Among several pollutants, heavy metals in line of river self purification do not decrease and accumulate in river-bed sediments and aquatic animals' body as well as causing biomagnifications by entering to the food chain. In this study, the capability of white water lily (Nymphaea Alba) has been surveyed in field of uptake and accumulation of heavy metals such as Pb, Cd and Mn (in form of synthetic to simulate with natural environment) in four concentration level such as 1, 2.5, 5 and 10 mg/l and 3 pH medium such as 5.5, 6.5 and 7.5 under the laboratorial conditions.   The result of research according to the coefficient of correlation and cluster analysis statistical method shows that Cd and Mn accumulation level in water lily tissue decrease by increasing the metals' concentration. The maximum of Mn accumulation (3.455 mg/gr) has been in Con. =1 mg/l and pH=7.5 and the maximum of Cd accumulation (0.55 mg/gr) has been in Con. =5 mg/l and pH=6.5. About lead, by increasing of Pb concentration, Pb uptake has decreased as well, but in Con. =10 mg/l and pH=5.5 has increased dramatically.   The rest of mentioned heavy metals in laboratorial solutions have been had ascending trend by increasing the metal concentrations up to the end of 10 mg/l, but by increase of pH in each metal concentration has been had decreasing trend. Totally, the maximum of the rest of metals is related to Cd (3.38 mg/l) and the minimum is due to Mn (0.002 mg/l).   By considering to the results, it could be understood that white water lily can be used as biological filter and phytoremediation method in order to heavy metals’ elimination from industrial waste water because of resistance against wetlands and lakes environmental conditions, quick growth, simple cultivation and its good adaptation with environment.  

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