A study of quenching and enhancing effects of some amino acids on peroxyoxalate chemiluminescence of rhodamine 6G

The quenching effect of l-cysteine, l-methionine on strong chemiluminescence of bis(2,4,6-trichlorophenyl)oxalate–H2O2 system in the presence of rhodamine 6G was studied. The chemiluminescence parameters were evaluated from computer fitting of the resulting intensity–time plots. These systems resulted in Stern–Volmer plots in the quencher concentration range of 4.0 × 10−6 to 4.0 × 10−5 M, with KQ values of 1.64 × 104 and 8.0 × 104 M−1 for l-metionine and l-cysteine, respectively. Also, this study describes the employment of l-histidine as a highly potent signal enhancer in peroxyoxalate chemiluminescence in the presence of rhodamine 6G.