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Silver nanoparticle-based spectrophotometric method for quantification of nile blue A in river water
S.S. Mortazavi,R. Sahraei,A. Farmany 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
A novel and sensitive spectrophotometric method is developed for the determination of nanomolar level of nile blue A in water samples based on its catalytic effect of silver nanoparticles on the oxidation of nile blue A by hexacyanoferrate (III) in acetate-acetic acid medium and at 25 ℃. The absorbance is measured at 595.5 nm with the fixed-time method. The optimization of the operating conditions regarding concentration of the reagents, temperature and interferences is also investigated. The calibration curve is linear over the concentration range between 85 and 2000 nM of nile blue A with good precision and accuracy. The detection limit of the method is down to 54. The relative standard deviation for a standard solution of 100.0 nM of nile blue A is 1.63% (n = 10). The proposed method provides a highly sensitive, selective and relatively rapid assay for nile blue A at nanomolar level without any pre-concentration and separation step. The method was applied to the determination of nile blue A in river water samples.
S. Sobhanardakani,A. Farmany,S. Abbasi 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
In this paper, a new modified multiwalled carbon nanotube electrode is reported for anodic stripping voltammetry quantification of tin. The electrode is based on the use of N-Nitrozo-N-Phenylhydrox-ylamine (cupferron) and multiwalled carbon nanotube. The influence of supporting electrolytes, deposition time, and applied potential on the sensitivity of electrode were investigated. The detection limit was 0.12 ng/ml and the RSD at a concentration level of 50 ng/ml, was 1.5%. The electrode has been applied for the determination of tin in fruit juice and bottled water with the satisfactory results.
V. Izadkhah,A. Farmany,S.S. Mortazavi 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1
In the present study, a novel Schiff base modified multiwalled carbon nanotube paste sensor wasdeveloped for the determination of trace amounts of copper in environmental samples. It is based on theencapsulation of the C24H30N6 Schiff base onto multiwalled carbon nanotube paste electrode. Theoperating conditions regarding supporting electrolytes, deposition time and applied potential on thesensitivity of electrode were established and optimized in detail. The working curve was linear in theconcentration range of 0.09–340 mg L 1. The relative standard deviation for 3 replicate determination ofthe 30 mg L 1 Cu(II) was 1.47%. The detection limit and quantification limit were 0.01 and 0.06 mg L 1,respectively. The sensor was successfully applied to the determination of copper in the river and citywater.
S.S. Mortazavi,A. Farmany 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.6
Catalytic-oxidation of Janus green was made in the presence of AgNPs. The reaction was monitoredspectrophotometrically at 610 nm. The system was optimized for the trace analysis of iodate. Themethod is featured with good accuracy and reproducibility for iodate monitoring in real samples withoutany pre-concentration and separation step.