Ruthenium(III) reacted with
O,
O′-diethyl dithiophosphate(dtp
-) in a hot hydrochloric acid solution and gave a red complex, [Ru(dtp)
3], which could be extracted into chloroform. The spectrum of the extracted complex was affected by experimental conditions such as reaction temperature, reaction time, hydrochloric acid concentration and dtp
- concentration. The calibration graph for ruthenium(III) was linear over the range of (0.17-5.2)×10
-4mol dm
-3 ruthenium(III) under the condition of 6mol dm
-3 hydrochloric acid, 0.1mol dm
-3 dtp
- and heating at 60°C for 15min. The molar absorptivity at 510nm was 2.18×10
3cm
-1 mol
-1 dm
3 and the relative standard deviation was 1.5% (12runs) for 3.5×10
-4mol dm
-3 ruthenium. The ions which interfered severely were Mo(VI), Cu(II), Pb(II), Bi(III), Tl(I), In(III), Te(IV), Cd(II), V(V), Hg(II), Ag(I), Co(II) and NO
2-.
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