A Simple Pre-concentration Method for the Determination of Nickel(II) in Urine Samples Using UV-Vis Spectrophotometry and Flame Atomic Absorption Spectrometry Techniques

https://doi.org/10.22146/ijc.35681

Ahmed Fadhil Khudhair(1*), Mouyed Khudhair Hassan(2), Hasan F. Alesary(3), Ahmed S. Abbas(4)

(1) Department of Chemistry, College of Science, University of Kerbala, Karbala, Iraq
(2) Oil Products Distribution Company (Kerbala), Ministry of Oil, Iraq
(3) Department of Chemistry, College of Science, University of Kerbala, Karbala, Iraq
(4) Department of Chemistry, College of Science, University of Babylon, Babylon, Iraq
(*) Corresponding Author

Abstract


The cloud point technique was effectively utilized for extraction and pre-concentration of nickel(II) in urine samples before measurement by UV-Vis spectrophotometer and AAS techniques. The metal response to a para-aminophenol (PAP) reagent in a non-ionic surfactant Triton X-114 medium was to form the Ni-PAP complex. The adopted concentration for PAP, concentration of Triton X-114, pH effect and water bath temperature, incubation time, salt effect, and interference effects were all optimized. The calibration curve was linear over the range of (0.0625–1.25) mg L–1 with a correlation coefficient r2 of 0.9682 for the UV-Vis spectrophotometer at a λmax of 629 nm. The limit of detection was 0.005 mg/L. The relative standard deviation for six replicates was 1.07%. This method was applied successfully to determine copper (II) concentrations in 44 urine samples of occupational worker samples as determined by UV-Vis spectrophotometry and FAAS techniques.


Keywords


Ni(II); cloud point extraction; non-ionic surfactant; urine sample, UV-Vis spectrophotometer; FAAS

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References

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DOI: https://doi.org/10.22146/ijc.35681

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