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Article

Spectroscopic and Voltammetric Analysis of Platinum Group Metals in Road Dust and Roadside Soil

1
SensorLab, Department of Chemistry, University of the Western Cape, Bellville 7535, South Africa
2
Chemistry Department, Faculty of Applied Sciences, Cape Peninsula University of Technology, Bellville 7535, South Africa
*
Author to whom correspondence should be addressed.
Environments 2018, 5(11), 120; https://doi.org/10.3390/environments5110120
Received: 17 September 2018 / Revised: 21 October 2018 / Accepted: 28 October 2018 / Published: 2 November 2018
(This article belongs to the Special Issue Environmental Toxicology of Trace Metals)
The emission of toxic compounds by increasing anthropogenic activities affects human health and the environment. Heavy road traffic and mining activities are the major anthropogenic activities contributing to the presence of metals in the environment. The release of palladium (Pd), platinum (Pt), and rhodium (Rh) into the environment increases the levels of contamination in soils, road sediments, airborne particles, and plants. These Pd, Pt, and Rh in road dusts can be soluble and enter aquatic environment posing a risk to environment and human health. The aim of this study is to determine the levels of Pd, Pt, and Rh with spectroscopy and voltammetric methods. Potential interferences by other metal ions (Na(I), Fe(III), Ni(II), Co(II)) in voltammetric methods have also been investigated in this study. At all the sampling sites very low concentrations of Pd, Pt, and Rh were found at levels that range from 0.48 ± 0.05 to 5.44 ± 0.11 ng/g (dry weight (d.wt)) for Pd(II), with 17.28 ± 3.12 to 81.44 ± 3.07 pg/g (d.wt) for Pt(II), and 14.34 ± 3.08 to 53.35 ± 4.07 pg/g (d.wt) for Rh(III). The instrumental limit of detection for Pd, Pt, and Rh for Inductively Coupled Plasma Quadrupole-based Mass Spectrometry (ICP-QMS) analysis was found to be 3 × 10−6 µg/g, 3 × 10−6 µg/g and 1 × 10−6 µg/g, respectively. In the case of voltammetric analysis the instrumental limit of detection for Pd(II), Pt(II), and Rh(III) for differential pulse adsorptive stripping voltammetry was found to be 7 × 10−8 µg/g, 6 × 10−8 µg/g, and 2 × 10−7 µg/g, respectively. For the sensor application, good precision was obtained due to consistently reproduced the measurements with a reproducibility of 6.31% for Pt(II), 7.58% for Pd(II), and 5.37% for Rh(III) (n = 10). The reproducibility for ICP-QMS analysis were 1.58% for Pd(II), 1.12% for Pt(II), and 1.37% for Rh(III) (n = 5). In the case of repeatability for differential pulse adsorptive stripping voltammetry (DPAdSV) and ICP-QMS, good standard deviations of 0.01 for Pd(II); 0.02 for Pt(II), 0.009 for Rh(III) and 0.011 for Pd, 0.019 for Pt and 0.013 for Rh, respectively. View Full-Text
Keywords: inductive coupled plasma spectroscopy; differential pulse adsorptive stripping voltammetry; dust; soil; platinum group metals; extraction methods inductive coupled plasma spectroscopy; differential pulse adsorptive stripping voltammetry; dust; soil; platinum group metals; extraction methods
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MDPI and ACS Style

Van der Horst, C.; Silwana, B.; Iwuoha, E.; Somerset, V. Spectroscopic and Voltammetric Analysis of Platinum Group Metals in Road Dust and Roadside Soil. Environments 2018, 5, 120. https://doi.org/10.3390/environments5110120

AMA Style

Van der Horst C, Silwana B, Iwuoha E, Somerset V. Spectroscopic and Voltammetric Analysis of Platinum Group Metals in Road Dust and Roadside Soil. Environments. 2018; 5(11):120. https://doi.org/10.3390/environments5110120

Chicago/Turabian Style

Van der Horst, Charlton, Bongiwe Silwana, Emmanuel Iwuoha, and Vernon Somerset. 2018. "Spectroscopic and Voltammetric Analysis of Platinum Group Metals in Road Dust and Roadside Soil" Environments 5, no. 11: 120. https://doi.org/10.3390/environments5110120

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