Assessment of the lake Gendabi salt for trace elements and toxic heavy metals by energy dispersive x – ray fluorescence spectrometry

dc.contributor.authorLugendo, Innocent
dc.date.accessioned2019-07-16T07:03:22Z
dc.date.accessioned2020-01-07T15:44:39Z
dc.date.available2019-07-16T07:03:22Z
dc.date.available2020-01-07T15:44:39Z
dc.date.issued2012
dc.descriptionAvailable in print formen_US
dc.description.abstractThis study is the first to analyze elemental contamination in salts from Tanzania. The study has analyzed samples of salts from Lake Gendabi, located in the northern part of Tanzania to determine the elemental concentrations in salts using EDXRF system. The aim of the study was to assess the safety of Gendabi salt for human consumption. Seventy five salt samples were collected from the Lake Gendabi floor and grouped into five grades (G1, G2, G3, G4 and G5) depending on the position of the salt from the lake shore. G1, G2 and G3 salts are reported to be used as table (cooking) salt while G4 and G5 are used for animal feeding as well as industrial productions. In addition to Na and Cl, concentrations of 17 more elements were determined in all five grades of salt. These included 7 toxic metals which are Al, Ni, Cr, Cd, Pb as well as Th and U which are also radioactive. Other elements were S, K, Ca, V, Cu, Mn, Fe, Zn, Br and I. All toxic elements in G1, G2 and G3 salts were in higher concentrations than the Maximum Tolerable Limits (MTLs) set by International Organizations. This is a concern as the salt is used for consumption in many parts of Tanzania. Furthermore, samples from G1 and G2 salts had percentage impurities of 0.67% and 0.51% respectively. This indicates less ability of the salt to retain iodine as the presence of metal impurities above 0.5% by weight, has been reported to negatively affect the stability of I. The Kruskal – Wallis test showed that, except for Mn, Cu, Cd and I, the mean concentrations of all elements varied significantly ( ) from one salt grade to another. The Spearman test showed that the concentrations of Na, Cl, V, Cr, Ni, Cu, Br and Pb increase with the increase of distance from the lake shore whereas those of Ca, Fe, I, Th and U decrease.en_US
dc.identifier.citationLugendo, I(2012), Assessment of the lake Gendabi salt for trace elements and toxic heavy metals by energy dispersive x – ray fluorescence spectrometry, master dissertation, University of Dar es Salaam (available at http://41.86.178.3/internetserver3.1.2/detail.aspx?parentpriref=)en_US
dc.identifier.urihttp://localhost:8080/xmlui/handle/123456789/1393
dc.language.isoenen_US
dc.publisherUniversity of Dar es Salaamen_US
dc.subjectTrace elementsen_US
dc.subjectHeavy metalsen_US
dc.subjectToxic heavy metalsen_US
dc.subjectX-ray fluorescence spectrometryen_US
dc.subjectLake gendabien_US
dc.titleAssessment of the lake Gendabi salt for trace elements and toxic heavy metals by energy dispersive x – ray fluorescence spectrometryen_US
dc.typeThesisen_US
Files