FLOW INJECTION SAMPLE INTRODUCTION-FAAS DETERMINATION OF CALCIUM IN COBALT AND NICKEL MATRIXES

A mthod of flame AAS for the direct determination of Ca in Co and Ni matrices was proposed in this paper.Matrix effect was efficiently reduced owing to the use of flow injection sample introduction.The release agent composed of alcoholic phenanthroline solution and La(Ⅲ) was on-line added to eliminate the interferences from Co,Ni and sulfate to the determination.The working conditions including release agent concentration,sampling time,interferences and elimination procedures were investigated in detail.Linear regression equation was expressed as A=0.000 9+0.024 1 C(mg·L-1) with correlation coefficient r=0.999 9,detection limit (3σ) 0.09 mg·L-1,RSD 1.1% and recoveries 95%-105%.