Abstract
The determination of trace (i.e. sub-ppb levels) ruthenium(III) was developed using catalytic reaction. In this reaction, copper(II)-phthalocyanine-3, 4', 4'', 4'''-tetrasulfonic sodium salt (Cu-PTS) as an indicator was decreased its absorbance by the oxidative decomposition with sodium periodate. Moreover, it was found that the reaction was extremely accelerated by adding ruthenium(III). Such catalytic reaction was applied to the flow injection analysis(FIA) of trace ruthenium(III). As results, the calibration curve of ruthenium(III) ion was linearly in the concentration range of 1 × 10-9 M to 1 × 10-7 M, and a sampling numbers per hour were 25 samples. Further, the relative standard deviation (RSD) was 0.75 % (n = 25) for Ru3+ 1×10-8 M, and the determination limits (3σ) of Ru3+ were 3.67× 10-10 M (37 ppt).
