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Title
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Selective and Sensitive Simultaneous Determination of Mercury and Cadmium based on the Aggregation of PHCA Modified-AuNPs in West Azerbaijan Regional Waters
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Type
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JournalPaper
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Keywords
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Cadmium Mercury Gold Nanoparticles Simultaneous Determination Multivariate Analysis
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Abstract
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The present study aims to present a new convenient sensor for heavy metals, based on aggregation of citrate-capped-N, N' biphenyl hydrazine 1, 2 dicarbothioamide (PHCA) - modified- (AuNPs). This paper reports a procedure for sensitive and selective spectrophotometric methods for simultaneous determination of mercury (Hg 2 2+ ) and cadmium (Cd 2+ ). For this aim multivariate data including kinetic spectra of AuNPs were collected during aggregation process. The characterization of AuNPs was performed by transmission electron microscopy (TEM) and Infra-Red (IR) spectroscopy. Partial least square (PLS) regression as an efficient multivariate calibration method was employed to make a connection between the surface plasmon resonance (SPR) spectra of the generated AuNPs. The number of PLS latent variables was optimized by leave-one-out cross-validation utilizing prediction residual error sum of square (PRESS). The linear range was in the range of 3.33 × 10 -5 - 3.33 × 10 -6 mol L -1 and 2.0 × 10 -5 - 1.0 × 10 -6 mol L -1 , the detection limit was 1.21×10 -7 and 0.5 ×10 -7 mol L -1 (n=5) for Hg 2 2+ and Cd 2+ , respectively. This method used successfully for simultaneous determination of Hg 2 2+ and Cd 2+ in West Azerbaijan regional waters namely Zarineh / Simineh rivers and Urmia lake.
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Researchers
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morteza Bahram (Third Researcher), (First Researcher), Tayyebeh Madrakian (Second Researcher)
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