Browsing by Author "Ombaka, Ochieng"
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Adsorption of Lead (II) Ions from Aqueous Solutions Using Mangroves Roots (Rhizophora Mucronata) Charcoal-Carbon Nanotubes Nanocomposite
Ngugi, Fidelis; Mwangi, Joel; Njagi, Eric; Ombaka, Ochieng (Journal of Multidisciplinary Engineering Science and Technology (JMEST), 2021)Providing clean and affordable water to meet human needs is a grand challenge of the 21st century. Worldwide, water supply struggles to keep up with the fast growing demand, which is exacerbated by population growth, ... -
Adsorption of rhodamine b from aqueous solution using mangroves (Rhizophora mucronata) carbon nanotubes nanocomposites
Ngugi, Fidelis; Mwangi, Joel; Njagi, Eric; Ombaka, Ochieng (www.allsubjectjournal.com, 2021)The use of dyes has increased dramatically and uncontrollably in last few decades. Different types of dyes are frequently employed in plastics, paper, cosmetics, leather, and textile industries for coloring purposes. These ... -
Analyses of geophagic materials consumed by pregnant women in Embu, Meru and Chuka towns in eastern province, Kenya
Mwangi, Gichumbi J.; Ochieng, Ombaka; Mwangi, Gichumbi, J.; Ombaka, Ochieng (2011)Geophagy is the deliberate consumption of soil and clay deposits by animals, including man. During pregnancy all the nourishment needed by the developing fetus comes from the mother, either the food she eats or the supplement ... -
Assessment of indegenious knowledge and practices on the use of clay among rural communities in Meru, Kenya
Mwiandi, Felicity Kaari *; Ombaka, Ochieng (2017)A survey was conducted to ascertain the clay applications and its health effects on humans among the rural communities. Household survey, focus group discussion and direct observation were employed. A structured questionnaire ... -
The Banach Numerical Range for Finite Linear Operators
Ohuru, Priscah M.; Musundi, Sammy Wabomba; Ombaka, Ochieng (Modern Scientific Press, Florida, USA, 2019-01)The numerical range has been studied extensively in Hilbert spaces. Properties of the numerical range such as non-emptiness, containment of the spectrum and in particular, convexity have been proved and results have ... -
). Characterization and classification of clay minerals for potential applications in Rugi ward, Kenya.
Ombaka, Ochieng (African Journals Online, 2016-11-16)The applications of various clayey minerals are related to their structural, physical and chemical characteristics. The physical and chemical properties of the clayey minerals dictate their utilization in the process ... -
Characterization and classification of clay minerals for potential applications in Rugi Ward, Kenya
Ombaka, Ochieng (2016)The applications of various clayey minerals are related to their structural, physical and chemical characteristics. The physical and chemical properties of the clayey minerals dictate their utilization in the process ... -
COMPLEXOMETRIC DETERMINATION OF ZINC USING HYDROXYTRIAZENE AS A METALLOCHROMIC INDICATOR
Ombaka, Ochieng (2020)New metallochromic indicators belonging to the class of hydroxytriazenes has been evaluated for the direct complexometric determination of Zinc in the presence of diverse ions. Reagent no (i), (ii) and (iii) has been ... -
Complexometric determination on Nickel (ii) in its synthetic alloys using selected Hydroxytriazene as metallochromic indicator
Ombaka, Ochieng (2019)A simple, rapid and reasonable selective Complexometric technique for nickel (II) determination using some selected hydroxytriazene as a metallochromic indicator is reported in the present study. The colour change at the ... -
Concentration of Inorganic Contaminants in Shallow Borehole Water in Chuka Sub-County, Kenya
M. Rugendo, Edith; C. Njagi, Eric; Ombaka, Ochieng (Journal of Chemical, Biological and Physical Sciences, 2020-11-24)Groundwater from shallow aquifers is an important source of portable water in Chuka Sub-County. However, most shallow boreholes in Chuka Sub-County are undocumented and susceptible to contamination by both geogenic and ... -
Determination of Essential Minerals and Toxic Elements Composition of the Natural Licks Consumed By Livestock in Tharaka-Nithi County, Kenya
Nderi, Onesmus Munene; Musalia, Levi; Ombaka, Ochieng (2015-11)Consumption of natural licks is common among domestic animals under natural circumstances, and as a substitute to commercial mineral licks among smallholder livestock keepers in Tharaka-Nithi County, Kenya, with a believe ... -
Determination of essential minerals and toxic elements composition of the natural licks consumed by livestock in Tharaka-Nithi County, Kenya
Nderi, Onesmus; Musalia, Levi; Ombaka, Ochieng (2015-11)The aim of this study was to determine the quantities of essential and toxic elements in the natural licks consumed by livestock in Igambang'ombe Division in Tharaka-Nithi County, Kenya. Ten highly used licks, five moderately ... -
Effect of Human Activities and Seasonal Variation on Water Quality of Nkenye (Chikuu) Stream in Chuka, Kenya
Ombaka, Ochieng; Gichumbi, Joel M.; Mukono, Simon T.; Kibara, D. (2013-01)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 ... -
Indigenous knowledge and applications of clay among rural communities in western Kenya
Kaari, M. F.; Ombaka, Ochieng (2019-01)A survey was conducted in Western Kenya involving 281 respondents to ascertain the clay applications and its health effects on human beings. Household survey, focus group discussions and direct observation were ... -
NEW METALLOCHROMIC INDICATORS FOR COMPLEXOMETRIC TITRATION OF COPPER (II) IN PRESENCE OF INTERFERING SPECIES
Ombaka, Ochieng (Life Science Informatics Publications, 2020-09)Six hydroxytriazenes has been introduced as a metallochromic indicator in the complexometric titration with EDTA and applied successfully to the titration of copper (II). A direct method of titration of Cu (II) with EDTA ... -
Physicochemical Proprieties of Pond Water in the Economic Stimulus Programme (ESP) Fish Ponds in Tharaka-Nithi County, Kenya
Kibaara, David Ithigi; Magana, Adiel Micheni; Githae, Eunice Wmamu; Ombaka, Ochieng (International Journal of Interdisciplinary Research and Innovations, 2020)In an effort to attain food security, Kenya has embraced aquaculture as one of its strategies. From 2009, the Government established thousands of fish ponds through the Economic Stimulus Programme (ESP). TharakaNithi ... -
Sensitivity analysis of treatment and counselling in a co-infection model of HIV/AIDS, tuberculosis and malaria
Ombaka, Ochieng (2016-02)This study presents a co infection deterministic model defined by a system of ordinary differential equations for HIV/AIDS, malaria and tuberculosis. The model is analyzed to investigate the potential impact of counseling ... -
Spectrophotometric Determination of cobalt (II) in low concentrations using hydroxytriazene as selective chelating agents
Ombaka, Ochieng; Gichumbi, J. M. (2011-12)The present work describes a selective, rapid and simple spectrophotometric method for the determination of cobalt (II) at trace levels using some selected hydroxytriazene. The method is based ... -
Spectrophotometric Determination Of Copper (Ii) In Soil From Ahero Rice Irrigation Schemes Using Hydroxytriazene
Ombaka, Ochieng (IOSR Journal of Applied Chemistry, 2020)A simple, rapid, sensitive and cost effective spectrophotometric technique for the determination of copper (II) using 3-hydroxy-3-m-tolyl-1-O-carboxyphenyltriazene has been reported. The complex formed was greenishyellow ...