Correlation of Aquatic Parameters to the Cadmium Bioaccumulation Capability onto Microalgae Biomass in an Urban Lake

Awalina Satya, Fachmijany Sulawesty, Ardiyan Harimawan, Tjandra Setiadi



The distributions of cadmium ions in water, microalgae biomass and sediment from Rawa Kalong Lake-Indonesia, a tropical hypereutrophic urban lake, were studied. Average concentration of cadmium ionsin water was above the threshold level for supporting safe aquatic life (ranged from 0.387 to0.574 µg/L) and microalgae biomass ranged 2.89 to 4.94 µg/g (dry weight). This urban lake was characterized as P-limited hypereutrophic,dominated by Aphanothecesp.(Cyanophyte phylum) with total abundance of over 768,200 individuals/L, low alkalinity, and low organic matter. Cyanophyteis capable of accumulating cadmium ions up to 4,150 times higher in its biomass than in water. Our findings demonstrate that the bioaccumulation of cadmium in microalgae show strong correlation to the cadmium content in microalgae biomass and to one of eleven parameters. The most significant parameter influencing the Bio-Accumulation Factor is the total phosphorus. Response Surface Analysis also shows that cadmium content in water is a crucial factor affecting bioaccumulation capability.

Keywords: Cadmium; Aphanothecesp.; biosorption; urban lake; aquatic parameters