Nitrite quenching of terbium luminescence in sodium dodecyl sulfate solutions

Abstract

Excited Tb3+, bound to sodium dodecyl sulfate (SDS) micelles, is quenched by NO2- with an apparent rate constant of (1.1 ± 0.2) × 107 M-1 s-1, a factor of ∼100 lower than in free solution. The quenching rate in the micellar solution is independent of the SDS concentration in the range of 0.02-0.1 M, implying that in this range all terbium ions are bound to the micelles. The addition of salt and partially water soluble alcohols increases the quenching rate constant. Some of the possible factors responsible for the enhancement are discussed. © 1981 American Chemical Society.