Browsing Journal Articles (PAS) by Author "Njoroge, Peter W."
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Analysis of Copper Deposits in Maragwa Location in Tharaka Nithi County – Kenya
Kugeria, P. M.; Njoroge, Peter W. (2022-05)A primary obstacle to some developing countries like Kenya is the reliance on agriculture when they are endowed with bulk of some mineral resources like copper. The economies of some developed and developing countries are ... -
Antimicrobial Activity of Root Bark Extracts of Rhus natalensisa and Rhus ruspolii
Njoroge, Peter W.; Opiyo, Sylvia A. (Scientific & Academic Publishing, 2019-08)Bacteria and fungi are frequent causes of serious opportunistic infections worldwide. Several effective antibiotic drugs are in the market. However, drug-resistance, side effects and cost of such antibiotics limits their ... -
Beneficiation of Iron in Thermal-Reduced Ilmenite by Magnetic Separation
Njoroge, Peter W.; Kariuki, Warui S. (International Journal of Science and Research, 2015)Increasing demands for Iron in countries development, and lack of conventional reducing agents has resulted into sourcing of alternative ways of beneficiating the iron ore. This paper reports on the study that was done ... -
Beneficiation of Iron in Thermal-Reduced Ilmenite by Magnetic Separation
Njoroge, Peter W. (2013)Increasing demands for Iron in countries development, and lack of conventional reducing agents has resulted into sourcing of alternative ways of beneficiating the iron ore. This paper reports on the study that was done to ... -
Characterization of Clays from selected sites for Refractory Application
Lomertwala, H. M.; Njoroge, Peter W.; Opiyo, Sylvia A.; Ptoton, Brian M. (2019-11)Clay is a stony or earthy mineral aggregate composed of fine-grained minerals, which are plastic at appropriate water content and hardens up when fired. Clay soils have various mineral groups such as kaolinite, smectites, ... -
Chemical Composition And Biological Activity Of Extracts From Conyza Species
Opiyo, Sylvia A.; Njoroge, Peter W.; Kuria, Kennedy M. (iosrjournals.org, 2023-04)The genus Conyza (Asteraceae) comprises about 50 species and found in the tropical and warm regions. Extracts from Conyza species have numerous pharmacological applications. The aim of this study was review the chemical ... -
Copper extraction by wet chemical method
Njoroge, Peter W.; Kugeria, Peterson Mutembei.; Mwangi, Isaac .; Wachira, Jackson. (Journal of Sustainable Mining, 2018) -
Copper Extraction Using Aluminum in Acidic Leachate Media
Kugeria, P. M.; Njoroge, Peter W. (IISTE, 2020)Copper is found in several minerals with varied elemental composition. For instance, copper minerals occur as chalcopyrite (CuFeS2), bornite (Cu5FeS4), chalcocite (Cu2S), covellite (CuS), cuprite oxide (Cu2O), and malachite ... -
Effect of Acid Treatment on the Chemical Properties of Clays from Selected Sites in Murang’a and Nyeri counties, Kenya
Lomertwala, Hassan M.; Njoroge, Peter W.; Opiyo, Sylvia A.; Ptoton, Brian M. (2020-11-30)Assessing improvement on the quality of clay has been conducted by treatment with different concentrations of hydrochloric and oxalic acid. This project intended to assess the effect of acid treatment on the elemental ... -
Effects of Lysinibacillus sphaericus on Physicomechanical and Chemical Performance of OPC Blended with Natural Tuff and Pulverized Fly Ash
Wanjiku, K. V.; Muthengia, J. W.; Ogunah, J.; Mutitu, D. K.; Kinuthia, J.; Mwirichia, R.; Thiong'o, J. K.; Mulwa, M. O.; Muriithi, G.; Njoroge, Peter W.; Munyao, D. M. (2022-06)This paper reports study findings on the use of Lysinibacillus sphaericus (at 1.0 × 107 cells/ml concentration) to enhance and improve the physicomechanical and chemical properties of blended Ordinary Portland Cement (OPC). ... -
Facile Removal of Phenol from Aqueous Solution Using Modulated Cornstarch Impregnated With Triethanolamine as Adsorbent: Sorption Isotherms and Kinetics
Bosuben, Haron; Njoroge, Peter W.; Opiyo, Sylvia A.; Mwangi, I. W. (2022-08)Background: The sources of phenolics pollutants in water are mainly pharmaceutical and chemical industries. The compounds are carcinogenic, cytotoxic, mutagenic and teratogenic even at modest concentrations. These health ... -
IJSET@2014 Page 707 Effects of Temperature on Ilmenite During Concentration of Iron in Laterites Using Charcoal and Separation using Magnetic Separation
Njoroge, Peter W. (2014)Effect of temperature on ilmenite minerals found in laterites has been investigated. It was found that during reduction of iron minerals in laterites to magnetite using charcoal at temperatures of about 500-700oC, ilmenite ... -
Impure Hydrazone Preparation from Chicken Dung
Kugeria, P. M.; Njoroge, Peter W.; Opiyo, Sylvia A.; Mwangi, I. W. (IISTE, 2020-09-30)Hydrazones are strong reducing agents. Some hydrazones like hydrazine are is highly toxic and unstable and are therefore found dissolved in water. Chicken dung contains amines and uric acid that are potential sources of ... -
Magnetic Concentration of Iron in Lateritic Soils from Kamahuha, Murang’a County, in Kenya using Carbon Monoxide Generated In-Situ
Njoroge, Peter W. (2014)Chemical and Mineral Analyses of laterites from selected sites in Kamahuha area of Murang’a County, in the Republic of Kenya, have been carried out with particular interest in the levels of iron and the type of minerals ... -
Monitoring the extraction of copper from chicken dung leachate using an aluminium electrode as an indicator
Kugeria, P. M.; Mwangi, I. W.; Muthengia, J. W.; Njoroge, Peter W. (Elsevier Ltd., 2019-11)Copper is found in several minerals in the earth's crust with varying the elemental and mineralogical composition.Several techniques of extraction have been investigated all in the effort of obtaining a cheaper and viable ... -
Plant Extracts and Terpenes with Antivenom Properties
Opiyo, Sylvia A.; Njoroge, Peter W. (IOSR Journal of Applied Chemistry (IOSR-JAC), 2024-03-16)Envenoming and snakebite mortality are a significant public health concern in rural tropical areas in developing countries due to limited access to healthcare. Anti-snake venom (ASV) is the most effective counter measure ... -
A Review of Biological Activities and Phytochemistry of Rhus Species
Opiyo, Sylvia A.; Njoroge, Peter W.; Ndirangu, Ephantus G.; Kuria, Kennedy M. (2021-04)The genus Rhus (family: Anacardiaceae, order: Sapindales) consists of more than 250 species distributed in the tropics, subtropics and temperate regions. Traditionally, extracts and products from Rhus species are regarded ... -
A Review of Fatty Acid Components in Avocado
Opiyo, Sylvia A.; Mugendi, Beatrice J.; Njoroge, Peter W.; Wanjiru, Samuel N. (2023-03)Avocado is one of the world's most economically significant tropical fruit crops. In recent years, there has been a lot of interest in avocado as a natural functional food in due to its excellent nutritional value and ... -
A Review Pesticidal Activity of Essential Oils against Sitophilus oryzae, Sitophilus granaries and Sitophilus Zeamais
Opiyo, Sylvia A.; Njoroge, Peter W.; Ndirangu, Ephantus G. (IOSR Journals, 2022-04)Infestation of cereals in storage by Sitophilus oryzae, Sitophilus granaries and Sitophilus Zeamais lead to great food loses in Sub-Saharan Africa. Some of the synthetic pesticides which are available are non-biodegradable ... -
Some Antibacterial and Antifungal Compounds from Root Bark of Rhus natalensis
Njoroge, Peter W.; Opiyo, Sylvia A. (Scientific & Academic Publishing, 2019-09)Phytochemical studies on Rhus natalensis root bark collected from Iten, Kenya led to isolation and characterization of five compounds namely epicatechin (1), 3-sitosterol (2), 3-sitosterol glucoside (3),stigmasterol (4) ...