Capillary electrophoresis (CE) has been developed as one of the powerful separation techniques for the analysis of inorganic and organic ions in complex matrices in the recent past. In aqueous samples, most of the inorganic ions are having weak absorption profiles in the UV-Vis region of the spectrum. These low absorption profile ionic species are commonly detected by indirect UV absorbance with the addition of an absorbing co-ion (chromophore) into the electrolyte. The inorganic cations oftenly require an additional complexing agent to selectively alter their similar mobilities and proper separation. The indirect detection at 214 nm was performed with α-hydroxyisobutyric acid (α-HIBA)-4-aminopyridine background electrolyte (BGE) that has a characteristic absorbance at 214 nm. The BGE was applied for the separation, analysis, and validation of metal ions in water samples. The metal ions such as K+, Na+, Ca2+, Mg2+, Mn2+, Fe2+, Cd2+, Pb2+, Ni2+ and Zn2+ were separated successfully in this study. Also, the effect of electrolyte pH, applied voltage and injection time for the separation of cations was investigated.
Fluoride is one of the few chemical contaminants in drinking water, even
though; it is known as an essential chemical component in water due to its beneficial effect
at a very low concentration. However, when present excessively in drinking water it has
detrimental effects on human health in terms of the prevalence of dental caries, skeletal
fluorosis and bone fractures. Endemic fluorosis, especially dental mottling and discoloration
has been prevalent in many parts of Eritrea. However, no well-established study has been
carried out to ascertain the fluoride content in the groundwater of the affected villages,
except a couple of researches conducted to estimate fluoride level in drinking water of the
villages around Keren and Elabered, where dental mottling and fluorosis is prevalent.
According to the researches the fluoride level in the underground water was found to be
higher than the maximum WHO limit of 1.5 mg/L. Butthe fluoride content of other places
(villages) with endemic dental fluorosis has not been determined and documented, and
therefore it is necessary to conduct this research in the affected areas to ascertain the fluoride
level in the drinking water of the community and compare it with the WHO standards.
In the present study, a comparative analysis was carried out on the luminescent properties of metaloquinolates of Zinc, Cadmium, Aluminium and the complexes have been used for the testing of white light emission in order to apply in phosphor converted White Light Emittting Diodes (pcLEDs). Initially, the resulting metaloquinolates were characterized by using Infrared, UV-Visible spectra, Thermogravimetry, Photoluminescence, and CIE Chromaticity Coordinates. The white light emission was realized by mixing each metaloquinolate with a red and blue emitters respectively. The results show that the complex, bis(8-hydroxyquinolinato)zinc(II), Znq 2 , can be used as excellent luminescent green emitter for phosphor converted white LEDs (pcLEDs), realizing better white light emission than the other two metaloquinolates.
Capillary electrophoresis (CE) is a method of choice for analysis of cations in different samples using indirect UV detection. The determination of metal ions can be studied by employing several electrolyte systems with indirect detection at various wavelengths. The indirect detection at 214 nm was performed and resulted in good separation of metal ions with glycolic acid-imidazole background electrolyte (BGE). The method was developed for the identification of metal ions in standard samples and then applied for the analysis of metal ions in real samples. Two samples (Multimin and Mineral max) have been collected from various locations, analysed and compared. Four metal ions (Na + , Mg 2+ , Mn 2+ and Cu 2+ ) were identified. These metals are useful for the animal protection.
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