Due to the excellent spectroscopic

Due to the excellent spectroscopic response of probe CMM, we nextevaluated its practicability by the determination of trace ClO− in environmental water samples (shown in Fig. 3). The specific concentrations of ClO− were calculated according to the fluorescent intensitycurve (Fig. 1B). As a result, the found ClO− concentrations of raw tapwater, pool water and distilled water are 8.25 μM, 5.94 μM, 0.84 μM.Interestingly, about a quarter of fluorescent intensity was observed withrespect to the raw tap water when adding boiled tap water to solution ofprobe CMM. The phenomenon indicated that the boiled tap water issafe enough in comparison with raw tap water. Moreover, the contentof ClO− in tap water left alone for 48 h is noticeably lower than freshlycollected tap water. Besides, the reliability of this method was furtherassessed by the determination of recovery of spiked ClO− in aforementioned water samples. The fluorescent intensity of each sample wastested three times (n = 3) and the results were listed in Table 1, whichalso could be expressed directly with Fig. S5. The recovery of ClO− inwater sample was between 98.7% and 102.5%. The RSD (relativestandard deviations) values were less than 1.43%, which indicated thatCMM was potentially applicable for ClO− determination in real sample.