Heavy metals concentration in water and accumulation in water mimosa (Neptumia oleracea Lour.) grown in the Tha Chin River

Abstract

The heavy metals contamination in water and water mimosa (Neptumia oleracea Lour.) grown in the Tha Chin River were investigated. The study sites were Song Pee Nong district, Suphan Buri Province and Sam Pran District, Nakhon Pathom Province. The water quality including pH, temperature, Dissolved Oxygen (DO), Electric conductivity (EC), Total Dissolve Solids (TDS), Biological Oxygen Demand (BOD), Chemical Oxygen Demand (COD), and salinity were analyzed. All of parameters was in the ranged of the water quality standards for surface waters of Thailand except BOD at Sam Pran District. The heavy metals including copper, cadmium, lead, nickel and zinc concentration were determined. The results showed that the heavy metals contamination in water were in order as follow: inc>lead>cadmium>copper>nickel, which were lower than the surface water quality standards values. The results indicated that water mimosa accumulated zinc in the highest levels in roots. The heavy metals accumulation in the water mimosa were in order as follow: zinc>lead>copper>nickel. The highest concentration of zinc, lead, copper and nickel accumulated in water mimosa were 452.60 ± 3.15, 128.97 ±. 13.70, 106.48 ± 7.06 and 17.28 ± 0.64 mg/kg dry weight, respectively.