A new catalytic-spectrophotometry method for sensitive determination of Acid Red 18 in water samples using silver nanoparticles

作者：Farmany Abbas^*; Sahraei Reza; Mortazavi Seyede Shima; Hashemi Ehsan

来源：Main Group Chemistry, 2014, 13(1): 23-28.

DOI：10.3233/MGC-130118

• Water samples
• catalytic-spectrophotometry
• acid red 18
• AgNPs

A simple and sensitive kinetic spectrophotometric method for the determination of nanomolar level of Acid Red 18, based on the catalytic effect of silver nanoparticles on the oxidation of Acid Red 18 by potassium periodate is described. The reaction rate was monitored spectrophotometrically by measuring the decrease in absorbance of Acid Red 18 at 505 nm. The detection limit of the method was 0.18 ng/mL and the linear range was between 0.5-485 ng/mL. The effects of acidity, concentration of reactants, reaction time, and external ions were also discussed. The optimum reaction conditions were fixed and some kinetic parameters determined. The relative standard deviation for the determination of Acid Red 18 at the concentration of 100 ng/mL was calculated to be 0.998 % (n = 10). The method has been successfully applied to the determination of Acid Red 18 in city, tap, and river water samples.

• 出版日期2014