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Title: Determination of Trace Elements in Hair From Residents of Nakuru District using Energy Dispersive X-Ray Fluorescence Analysis
Authors: Muriithi, P. M
Keywords: Trace Elements -- Hair -- Residents -- Energy Dispersive X-Ray Fluorescence Analysis
Issue Date: Oct-1995
Publisher: Egerton University
Abstract: A method of Energy dispersive X—ray Fluorescence analysis of hair samples for trace elements by acid digestion and heavy metal co—precipitation with with sodium diethyl—dithiocarbomate (NaDDTc) was applied for the analysis of trace elements in hair. Detection Limits of the method for most elements was in the range 0.4 — 3.5 pg/g. The RSDs (relative standard deviations) of the concentration values for most element of analytical interest was 15% or better. Data for trace element concentrations in hair has been analysed and compared with those from different sampling locations and it appears that most of the essential trace elements i.e., Mn, Co, Ni and Se are constant in all the donor groups and their mean concentrations are 20.2, 2.7, 7.1 and 1.3 pg/g respectively. The essential elements Fe and Cu on the other hand show marked variability akin to that displayed by the non essential trace elements As, Hg and Pb. Variation of the concentrations of the Elements Cr, Mn, Fe, Co, Ni, Cu, Zn, As, Hg, Se and Pb with age and Sex was investigated. It was found that Cr, Mn, Co, Zn and Se did not vary appreciably with donor Age. The concentrations of elements Fe, Cu, Pb and Hg increased with donor age while Ni decreased with Age. No significant xi difference was observed between the elemental concentrations for Male and Female donors at the 95% confidence level. The correlation of each pair of elements in the hair samples for the whole population was investigated and revealed that Cu was positively correlated (p < 0.001) with As, Hg and Pb and was negatively correlated with Se. Mercury and Lead were found to be highly correlated. Principal component Analysis of all the sample population considered revealed that Cu, Pb, Hg and As are highly loaded in component l which accounted for 43.63% of the Total variance, this component was attributed to anthropogenic sources. The elements Ni and Fe were found to be highly loaded in component 2 which accounted for 22.14% of the total variance.
Appears in Collections:Faculty of Science

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