Molecular Probe for the Determination of Hydroxyl Radicals in Heterogeneous Systems: Coumarin†

doi:10.7503/cjcu20180364

Abstract

Abstract:

Three common molecular probes—disodium terephthalate(TPA), sodium benzoate(BA) and coumarin(COU), with the corresponding transformation products of which are 2-hydroxyterephthalic acid(hTPA), salicylic acid(SA) and 7-hydroxycoumarin(7-hCOU) were assessed, respectively. The results showed that transformation products of TPA and BA were adsorbed seriously on ferrihydrite(the maximum adsorption capacity were 2.49 and 2.09 mg/g, respectively), which made them unsuitable to be used in heterogeneous systems. Moreover, COU was much better than TPA and BA in terms of sensitivity, linearity and concentration range responded to ·OH. And 7-hCOU had lower limit of detection than hTPA and SA(0.005, 0.046 and 0.072 μmol/L, respectively). COU was further demonstrated to be capable of quantifying ·OH produced in microbe-mineral systems and soil and sediment systems during redox cycle, where it showed great stability and reproducibility. It proved to be a reasonable molecular probe to apply to other ·OH production processes in heterogeneous systems and natural environment. Notably, it should be in the same pH buffer when comparing ·OH concentration between different systems since the pH has a great influence on the ·OH production.

Key words: Hydroxyl radical, Fluorescence probe, Coumarin, Microbe-mineral

CLC Number:

O657.3

TrendMD:

HAN Ruixia,LÜ Jitao,ZHANG Shuzhen. Molecular Probe for the Determination of Hydroxyl Radicals in Heterogeneous Systems: Coumarin^†[J]. Chem. J. Chinese Universities, 2018, 39(12): 2658.

Figures/Tables 6

Fig.1 Reactions between three molecular probes[TPA(A), BA(B), COU(C)] and hydroxyl radicals(D), adsorption of salicylic acid structure on iron oxides

Fig.2 Adsorption of molecular probes and their products on ferrihydrite(A) TPA; (B) BA; (C) COU; (D) hTPA; (E) SA; (F) 7-hCOU.

Fig.3 Calibration curves of molecular probes(A) and transformation products(B)

Fig.4 Quantification of hydroxyl radicals produced by Fenton reactions with three molecular probes(A) hTPA; (B) SA; (C) 7-hCOU.

Fig.5 Production of ferrous ions(A) and hydroxyl radicals(B) in microbe-ferrihydrite system during the redox cycle

Fig.6 Concentration of ·OH determined by coumarin(A) and relative intensity of DMPO-OH detected with ESR(B)a. GSD-4+3 mmol/L H2O2+100 mmol/L DMPO; b. GSS-7+3 mmol/L H2O2+100 mmol/L DMPO; c. GSD-6+3 mmol/L H2O2+100 mmol/L DMPO; d. GSD-4+3 mmol/L H2O2+100 mmol/L DMPO+5%(volume fraction)DMSO; e. GSD-4+100 mmol/L DMPO produced in the oxidation of chemically-reduced soil(GSS-7) and sediments(GSD-4, GSD-6).

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