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The trace elements are known. AAS is just a method to detect their concentrations. Prior to AAS' development, experimental methods could not detect the presence of trace elements because they were in such low concentration. Once AAS was developed, it was found that trace elements existed in extremely small concentrations (as low as ppb) and were essential to some life forms.how does aas detect which metal ions are in trace elements if it is only used to find the concentration?