Determination Of Heavy Metal (Pb, Cd And Zn) In Blue-Green Algae (Nostoc Commune) By Atomic Absorption Spectrophotometry
The blue-green algae(Nostoc commune) is edible algae. It was traditionally used tomaintain the stomach and intestines.Blue-green algae occur naturally in a wide varietyof environmentsincluding ponds, drainpipe area and flooding area.All of water sources have been contaminated.Therefore the determinations of heavy metals in algae wereimportant.The samples were collected from five areas. The samples were analyzed byAtomic Absorption Spectrophotometer (AAS). The results showedthe ranged concentration of 2.3-3.7, 15.0-29.0 and 7.9-76.3 mg/kg dry weight for Cd, Pb and Zn, respectively. The concentration of Cd and Pb were significantly higher than permission limits set by Food Safety Law and Regulation (Thailand). 1981. The blue-green algae consumption should realize this and focus on the sources of growth.
Keywords- AAS, Blue-green algae, Cadmium, Lead, Zinc