As a result of the significant disruption that is being caused by the COVID-19 pandemic we are very aware that many researchers will has difficulty in meeting the timelines associated with our peer review process during normal times.  Please do let us know if you need additional time. Our systems will continue to remind you of the original timelines but we intend to be highly flexible at this time.

A b s t r a c t

In this work a rapid and selective procedure for separation and preconcentration of lead (Pb2+) before determination by electrothermal atomic absorption spectrometry (ETAAS) was developed. The procedure is based on the electrodeposition on a graphite probe modified with palladium. The lead was deposited from acetate buffer solution at pH 5.5. Various parameters, such as pH of solutions, deposition potential, buffer concentration, stirrer speed, time of deposition and temperature program, were optimized. After optimization of the conditions, detection limit 17 ng L–1 by 3 σ, and enrichment factor 61 were achieved for 2 min electrodeposition time and improved as deposition time was increased. Linearity of calibration was kept between 0.05-0.50 μg L–1 with a correlation coefficient of 0.9979 and suitable precision, R.S.D. % = 5.1 (n = 8). Samples were digested completely in a closed microwave digestion system using only perchloric acid, and interference owing to various cations was also investigated. The procedure was successfully applied to determine the presence of lead in rice, radish, okra, onion and water samples.

 

 

 

 

Authors

Reza Moradkhani, Ahmad Rouhollahi , Hamid Shirkhanloo, Jahan B. Ghasemi

Conclusion

The results obtained in this work demonstrate an effective approach to improve the detection limit of ETAAS for lead determination. The method due to advantages such as high sensitivity, low detection limit and high tolerance limit of common ions is a powerful tool for rapid and sensitive determination of lead in complex matrixes. Also, the proposed method is easy, safe and inexpensive for preconcentration and separation of lead and determination by ETAAS in environmental samples.

Download Paper

 

Contact us

Publisher:AMECJ publisher with the License number of 83095 From the Ministry of Guidance, Iran. To see the Certificate please click here.

Madadkaran Alley,Farjam St., Shahnazari Ave, Mirdamad, 

Tehran, Iran     P: 1545653718