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• W2084264113 abstract "Magadi from Lake Magadi, Kenya, Lake Natron, Tanzania, Lake Katwe, Uganda, El-Atrun, Sudan and efflorescent crust from the soil surface (scooped magadi) from northern Tanzania have been analysed chemically to determine fluoride and carbonates concentrations and by X-ray diffraction to determine the mineralogical composition. Magadi from Lake Natron and Lake Magadi are found to be very similar consisting mainly of trona (CO32− + HCO3− > 10.4 meq [g magadi]−1) mixed with halite and either kogarkoite or villaumite, respectively, resulting in fluoride concentrations up to 8.7 mg F− [g magadi]−1. The scooped magadi is not as pure with respect to trona as the crystalline magadi, but the fluoride content is of same order of magnitude (0.23–5.1 mg F− [g magadi]−1). The scooped magadi consists of trona (CO32− + HCO3 = 3.5–9.5 meq [g magadi]−1) with different mixtures of halite, quartz, villiaumite, kogarkoite and thermonatrite. No fluoride containing minerals are identified in magadi from Uganda and Sudan, probably due to the very low fluoride concentrations of 0.02 and < O.24 mg (g magadi)−1, respectively, indicating that these samples are not contaminated with fluoride. The Sudanese magadi is a different mixture of trona, halite and quartz resulting in a variation in the carbonate concentration of 4.6–11.9 meq (g magadi)−1. The magadi from Lake Katwe consists of trona (CO32− + HCO3− = 7.0 meq [g magadi]−1) mixed with burkeite and halite. Le magadi du Lac Magadi, Kenya, du Lac Natron, Tanzanie, du Lac Katwe, Ouganda, et d'El-Atrun, Soudan, et la croûte efflorescente à la surface du sol du nord de la Tanzanie (magadi écopé) ont été analysés chimiquement pour déterminer les tensurs en fluorures et en carbonates et par diffraction de rayons X pour déterminer la composition minéralogique. Les magadis du Lac Natron et du Lac Magadi sont très semblables et consistent surtout en trona (CO32− + HCO3− > 10.4 meq [g magadi]−) mélangé à la halite et soit la kogakoïte, soit la villiaumite, donnant des teneurs en fluorures jusqu'à 8.7 mg F− meq (g magadi)−. Le magadi écopé n'est pas aussi pur que le magadi cristallisé en ce qui concerne le trona mais la teneur en fluorure est du même ordre de grandeur (0.23–5.1 mg F− meq [g magadi]−. Le magadi écopé consiste en trona (CO32− + HCO3− = 3.5–9.5 meq [g magadi]−1) avec différents mélanges de halite, quartz, villiaumite, kogarkoïte et thermonatrite. Aucun minéral fluoré n' a été identifié dans le magadi d'Ouganda et du Soudan, probablement à cause de très faibles en fluorures (respectivement, 0.02 et < 0.24 meq [g magadi]−1) indiquant que les échantillons ne sont pas contaminés par les fluorures. Le magadi soudanais est un mélange différent de trona, halite et quartz, donnant des variations de teneurs en carbonates de 4.6 à 11.9 meq (g magadi)−1. Le magadi du Lac Katwe consiste en trona (CO32− + HCO3− = 7.0 meq [g magadi]−1) mélangé à la burkéite et la halite." @default.
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• W2084264113 date "1999-08-01" @default.
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• W2084264113 title "East African magadi (trona): fluoride concentration and mineralogical composition" @default.
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• W2084264113 doi "https://doi.org/10.1016/s0899-5362(99)00107-4" @default.
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