Rapid quenchofluorimetric determination of nickel(II) in some real and environmental samples

A fluorimetric method for rapid determination of Ni at trace and ultratrace levels 1 ng/ml- 1 g/ml] has been developed. It is based on the efficient quenching action of Ni (II) on the native fluoresence _ex(max) = 288 nm, _em(max) = 444.8 nm] of 4,7-diphenyl 1,10-phenanthrolinedisulfonate (bathophenanthrolinedisulfonate) solution at low acidities. The method is very simple, rapid and accurate with high precision (R.S.D. = 0.66% at 50 ng/ml). The method has been applied directly to mineralised solutions of several real and environmental samples and the results of nickel determinations are in excellent agreement with the certified values. It is a quick single-step method that requires no clean-up.