Fig. 4. (Color online) The excitation-emission matrices (EEM) with a fluorometer (Varian Cary Eclipse) to samples A and B in 10 ml cuvettes are presented in figure (a) and (b), respectively. (a) Sample A (Ref. LAB) is a laboratory-synthesized LS sample comprising LAB, PPO, and bis-MSB, with a ratio of 1 l for LAB, 30 mg/l for bis-MSB, and a total of 3 g/l for PPO. (b) Sample B (EJ309) is a commercial LS sample, EJ309 from the EJ technology company.
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