Atomic Absorption Spectrometric Determination of Silver, Bromide and Iodide Ions in a Flow System Using an on-Line Preconcentration Technique

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Abstract
Silver, bromide and iodide ions are determined using a flow analysis system and precipitation as a reconcentration technique. The precipitate formed by reaction of cation and anion in a Tygon tube containing glass beads and connected to the atomic absorption spectrophotometer is dissolved by passing a solution of suitable dissolving agent. The dissolving agent dissolves the precipitate and the formed soluble complex is transported to the atomic absorption spectrophotometer, yielding a signal. The signal height is proportional to silver concentration which is in turn proportional to anion concentration. Silver was precipitated as AgCl and dissolved by S2O3=, CN− and NH3 solutions, bromide was precipitated as AgBr and dissolved by S2O3=and CN− solution and iodide was precipitated as AgI and dissolved by CN− solution. This method has proved to be sensitive, simple and precise. The lowest detection limit is 4.6×10−9M for silver when it is precipitated as AgCl and dissolved by s2O3 2− solution, 1×10−6M for bromide when it is precipitated as AgBr and dissolved by S2O3 2− solution and 1×10−6M for iodide when it is precipitated as AgI and dissolved by CN− solution.