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(a → d) Surface plasma resonance absorbance spectra for gold nanoparticles (AuNPs), AuNPs with 2.0 mg/L metsulfuron-methyl, AuNPs with 2.0 mg/L metsulfuron-methyl and 2.0 mg/L melamine, and AuNPs with 2.0 mg/L melamine, respectively (acetate buffer solution: 10 mM, pH 3.5, 0.2 mL). Insert: picture of AuNPs solutions.
