Abstract
Determination of nickel in sea water was studied by graphite furnace atomic absorption spectrometry (GFAAS). Nickel ions were preconcentrated by a precipitation method using iron (II) ions and sodium diethyldithiocarbamate (DDTC) at pH7. The precipitate containing nickel was collected on a membrane filter paper, and then dissolved with 30ml of nitric acid (1+12), followed by evaporation to dryness. The sample solution for GFAAS was obtained by redissolving the evaporation residue with 10ml of nitric acid (1+25) It was possible to determine nickel ions without any interfering effects of the copresence ions in sea water. The limit of detection and the lower limit of determination were 0.5, 1.6μg/l, respectively. This method was satisfactorily applied to the determination of nickel ions in sea water.
