Browsing by Author "Kibara, D."

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Effect of Human Activities and Seasonal Variation on Water Quality of Nkenye (Chikuu) Stream in Chuka, Kenya
(2013-01) Ombaka, Ochieng; Gichumbi, Joel M.; Mukono, Simon T.; Kibara, D.
Composite water and sediment samples were taken from Nkenye stream at five different sampling stations during wet and dry seasons. Water quality parameters were analyzed using standard methods to ascertain the effect of human activities on the water quality. The variations in the physicochemical and biological parameters were observed from station to station both in the dry and wet seasons. These variations were attributed to human activities. Results showed significant seasonal variation in most measured parameters with a few showing significant spatial variation. The characteristics of the water from the stream revealed an acceptable quality for most of measured parameters when compared with drinking water standards. However, high values of turbidity, iron, manganese, chromium and microbial load were recorded compared with drinking water standards, which call for proper treatment of the water before being used by the public. The results of sediment samples revealed that silicate, iron, aluminum are present in major quantities while other minerals are present in trace amounts. Thus the present study concludes that Nkenye stream water is contaminated and needs attention for it to be safe for domestic use. (2) (PDF) Effect of Human Activities and Seasonal Variation on Water Quality of Nkenye (Chikuu) Stream in Chuka, Kenya. Available from: https://www.researchgate.net/publication/305771233_Effect_of_Human_Activities_and_Seasonal_Variation_on_Water_Quality_of_Nkenye_Chikuu_Stream_in_Chuka_Kenya [accessed Nov 03 2020].
Rapid, Economical and selective Compexometric Determination of Iron (III) in its synthetic alloys using 3 hydroxy-3- phynyl-1-(2,4,6-tribromophynyl)
(2013-09) Ochieng, Ombaka; Musundi, Sammy Wabomba; Gitonga, L. K .; Kibara, D.
The present study describes a simple, selective, rapid and economical method for the determination of iron (III) in its synthetic alloys using 3-hydroxy -3- phenyl-1- (2,4,6- tribro mophenyl) triazene as metallochromic indicator in the 𝑃𝐻 and temperature range of 2.5-3.0 and 20 −600𝑐 respectively. The colour and shape of the synthesized indicator was light yellow shinning needles having melting point of 590𝑐. It was crystallized from ethanol. The results of elemental study showed that, the values of C, H, N obtained experimentally agrees very well with those obtained theoretically. The colour at the end point changes from violet to light yellow using EDTA as a titrant. There is no interference in either determination from common metal and anion ions other than Pb(II), Cr(II), Mo(VI), Mn(II), U(vI), Cu(II), Cd(II), 𝐹−, 𝑃𝑂43−, 𝐶2𝑂42−, 𝐻𝑃𝑂42−. Reproducible and accurate results are obtained for 5.59 - 1.12mg of Iron with relative error less than ±1.79% and standard deviation not more than 0.10%. The results of the test method and reference method (Atomic absorption spectrophotometric) showed that, there is no statistical difference in the results by the two methods.
Rapid,Economical and selective Compexometric Determination of Iron (III) in its synthetic alloys using 3 hydroxy-3 phynyl-1-(2,4,6-tribromophynyl)
(2019-09) Ombaka, O.; Musundi, S. W.; Gitonga, L. K.; Kibara, D.; Olivia, A. N.
The present study describes a simple, selective, rapid and economical method for the determination of iron (III) in its synthetic alloys using 3-hydroxy -3- phenyl-1- (2,4,6- tribromophenyl) triazene as metallochromic indicator in the 𝑃𝐻 and temperature range of 2.5-3.0 and 20 − 600𝑐 respectively. The colour and shape of the synthesized indicator was light yellow shinning needles having melting point of 590𝑐. It was crystallized from ethanol. The results of elemental study showed that, the values of C, H, N obtained experimentally agrees very well with those obtained theoretically. The colour at the end point changes from violet to light yellow using EDTA as a titrant. There is no interference in either determination from common metal and anion ions other than Pb(II), Cr(II), Mo(VI), Mn(II), U(vI), Cu(II), Cd(II), 𝐹−, 𝑃𝑂4 3−, 𝐶2𝑂4 2−, 𝐻𝑃𝑂4 2−. Reproducible and accurate results are obtained for 5.59 -1.12mg of Iron with relative error less than ±1.79% and standard deviation not more than 0.10%. The results of the test method and reference method (Atomic absorption spectrophotometric) showed that, there is no statistical difference in the results by the two methods.