RAPID QUENCHOFLUORIMETRIC DETERMINATION OF NICKEL(II) IN SOME REAL AND ENVIRONMENTAL-SAMPLES

A fluorimetric method for rapid determination of Ni at trace and ultra trace levels [1 ng/ml-1 mu g/ml] has been developed. It is based on th e efficient quenching action of Ni(II) on the native fluoresence [lamb da(ex(max)) = 288 nm, lambda(em(max)) = 444.8 nm] of 4,7-diphenyI 1,10 -phenanthrolinedisuIfonate (bathophenanthrolinedisulfonate) solution a t low acidities. The method is very simple, rapid and accurate with hi gh precision (R.S.D. = 0.66% at 50 ng/ml). The method has been applied directly to mineralised solutions of several real and environmental s amples and the results of nickel determinations are in excellent agree ment with the certified values. It is a quick single-step method that requires no clean-up.