Liège, Belgium
Liège, Belgium

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Perrault K.A.,University of Technology, Sydney | Stefanuto P.-H.,Analytical Chemistry Group | Stuart B.H.,University of Technology, Sydney | Rai T.,University of Technology, Sydney | And 2 more authors.
Journal of Separation Science | Year: 2014

Challenges in decomposition odour profiling have led to variation in the documented odour profile by different research groups worldwide. Background subtraction and use of controls are important considerations given the variation introduced by decomposition studies conducted in different geographical environments. The collection of volatile organic compounds (VOCs) from soil beneath decomposing remains is challenging due to the high levels of inherent soil VOCs, further confounded by the use of highly sensitive instrumentation. This study presents a method that provides suitable chromatographic resolution for profiling decomposition odour in soil by comprehensive two-dimensional gas chromatography coupled with time-of-flight mass spectrometry using appropriate controls and field blanks. Logarithmic transformation and t-testing of compounds permitted the generation of a compound list of decomposition VOCs in soil. Principal component analysis demonstrated the improved discrimination between experimental and control soil, verifying the value of the data handling method. Data handling procedures have not been well documented in this field and standardisation would thereby reduce misidentification of VOCs present in the surrounding environment as decomposition byproducts. Uniformity of data handling and instrumental procedures will reduce analytical variation, increasing confidence in the future when investigating the effect of taphonomic variables on the decomposition VOC profile. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Kamal S.S.K.,Analytical Chemistry Group | Sahoo P.K.,Analytical Chemistry Group | Vimala J.,Analytical Chemistry Group | Prasad N.D.V.,Analytical Chemistry Group | And 2 more authors.
Exploration and Research for Atomic Minerals | Year: 2013

In this paper we report a fast and reliable method for the analysis of 13 trace level impurities (Te, Sb, As, Bi, Pb, Mn, Ni, Ag, Sn, Zn, Fe, Se and Cd) in oxygen free electrolytic copper using a magnetic sector based inductively coupled mass spectrometer. Out of the 13 elements, eleven elements excluding Fe and Se could be analyzed at a low resolution of 300 in link scan mode. For Fe and Se resolutions of 4000 and 10000 were respectively used to separate the analyte signal from their isobaric interferences. We also report the value for Cd in the NBS 396 CRM, which was not reported in the certified values using isotopic ratio studies.

Kamal S.S.K.,Analytical Chemistry Group | Vimala J.,Analytical Chemistry Group | Sahoo P.K.,Analytical Chemistry Group | Ghosal P.,Analytical Chemistry Group | And 3 more authors.
Journal of Experimental Nanoscience | Year: 2016

This paper describes the applicability of a modified polyol process in conjunction with a transmetallation reaction in synthesis of CoyAg100− y nanocrystallites of a core–shell structure. The substitution Co → Ag is varied as 20 ≤ y ≤ 95 by tuning the microstructure with functional magnetic and giant magneto resistance properties. The existence of core–shell structures was confirmed through transmission electron microscope and the size of Co-core increased from 8 to 50 nm with decrease in Ag-content of the sample. The magnetic behaviour of the sample changed from a pseudo-superparamagnetic nature to ferromagnetic with increase in Co-core size. Normalised saturation magnetisation values increased from 89.5 to 128.6 emu/g with increase in size of Co-core; however, none of the ferromagnetic samples exhibited any magneto resistance (MR). A value of 2.0% MR was observed in case of Co20.6Ag79.4 which increased to a maximum of 3.6% MR for Co36.6Ag63.4 sample when measured at 5 K. © 2016 Informa UK Limited, trading as Taylor & Francis Group

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