Determination of Trace Carbaryl in Water by Europium-Diallyl Phthalate Fluorescent Probe / 分析化学

ABSTRACT

A rapid and sensitive method for the determination of trace carbaryl in water by using diallyl phthalate-europium ( Eu3+) as fluorescent probes was developed. The interaction between Eu3+ and diallyl phthalate and carbaryl was studied by high resolution mass spectrum, and the fluorescence spectra change of complexes before/after binding with carbaryl was also investigated. The influence factors of fluorescence intensity including solution pH and interferent were studied. The results showed that two diallyl phthalate molecules were complexed with one Eu3+to form stable complexes. Carbaryl could also interact with the probe to form multiple complexes, which significantly increased the fluorescent efficiency of the probe. At pH 9. 0 of solution and by using 245/615 nm as excitation/emission wavelength, the fluorescence intensity showed good linear relationship with the carbaryl concentration ranged from 6. 25í10-8 mol/L to 2. 50í10-6 mol/L, and the linear correlation coefficient was 0. 9968. The detection limit of the method was 9. 6í10-9 mol/L. Water samples were extracted by acetonitrile, and then detected by europium ( Eu3+)-diallyl phthalate fluorescent probe. The recovery of the method was 91. 8%-94. 5%, while RSD was within 6. 1%. The method is suitable for the rapid determination of carbaryl in water samples.