Determination of Cobalt(Ⅱ) in Environmental Water by Micro-Column in-Situ Preconcentration and Flow Injection Flame Atomic Absorption Spectrometry

Trace amount of cobalt(Ⅱ) in environmental water sample was preconcentrated in situ by adsorption on a micro-column packed with activated carbon which has been loaded with oxine,DDTC and APDC. By using the on-the-spot sampling with the micro-column,traces of cobalt(Ⅱ) in environmental water were enriched continuously. An on-line desorption and FI-FAAS analytical system was proposed for the determination of Cobalt(Ⅱ). Cobalt(Ⅱ) on the micro-column was desorbed with 3 mol·L-1 HNO3 and determined by FAAS. Detection limit (3σ) of the method was found to be 1.13 μg·L-1,in 10 mL of the eluate as sample. In the analysis of 3 water samples by the proposed method,values of RSD′s (n=6) obtained were less than 1%.