Fig. 6

EPR spectra of CuO NPs suspension in the presence of TEMP without As(III) (a) and with the addition of As (III) at pH 11.0 (b); EPR spectra of CuO NPs suspension in the presence of TEMP after the reaction with and without NaN₃ (c) and in the presence of DMPO and BMPO (d) without As(III) at pH 11