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Publications


2017

Madadi, VO, Ngotho MW, Masese FA.  2017.  Drinking Water Quality Challenges in Nakuru County, Kenya. IJSRSET. 3(6):5-11.
Ondiere, VB, Vincent MO, Ochieng AA, Oduor FDO.  2017.  Assessment of Heavy Metals Contamination in Lake Elementaita Drainage Basin, Kenya. International Journal of Scientific Research in Science, Engineering and Technology. 3(5):283-289.
Mbugua, JK, Guto PM, Madadi VO, Kamau GN.  2017.  Modeling of Experimental Adsorption Isotherm Data for Chlorothalonil by Nairobi River Sediment. IJSRSET,. 3(5):259-268.
Bernard, K, Wandiga SO, Madadi VO, Mukabi M.  2017.  Dissipation studies of Amitraz in cattle dips in Bureti, Kericho county- Kenya. International Journal of Scientific Research in Science, Engineering and Technology. 3(5):248-253.
Kamau, BN, Wandiga SO, Madadi VO.  2017.  Dissipation Studies of Ridomil Gold Pesticide on Potatoes in Nyandarua County, Kenya. IJSRSET. 3(5):221-229.
Okworo, EK, Madadi VO, Abong’o DA, Ochieng A.  2017.  Assessment of the Level of Organochlorine Pesticides Contamination in Kales, Water and Soil from Naivasha, Kenya. International Journal of Scientific Research in Science, Engineering and Technology. 3(5):205-213.
Sherrif, SS, Madadi V.  2017.  Adsorption of Lambda Cyhalothrin onto Athi River Sediments: Apparent Thermodynamic Properties. International Journal of Scientific Research in Science, Engineering and Technology. 3(3):568-574.
Aucha, JK, Wandiga SO, bong’o DA, Madadi VO, Osoro EM.  2017.  Organochlorine pesticides in air and soil from nairobi and mount kenya region, kenya. IOSR Journal of Applied Chemistry (IOSR-JAC). 10((7)2):5-11.
Madadi, VO, Wandiga SO, Ndunda EN, Mavuti KM.  2017.  Analysis of Organochlorine Pesticides in Lake Naivasha Catchment. IJSRSET. 3(5):139-149.

2016

Macharia, JW, Wandiga SO, Njenga LW, Madadi VO.  2016.  Moringa oleifera and Ceramic Filters for Escherichia coli and Turbidity removal from drinking water. IOSR-JAC. 9(5):46-55.
Osoro, EM, Wandiga SO, Abong’o DA, Madadi VO, Macharia JW.  2016.  Organochlorine Pesticides Residues in Water and Sediment from Rusinga Island, Lake Victoria, Kenya. IOSR-JAC. 9(9):56-63..

2015

Abong’o, DA, Wandiga SO, Jumba IO, den P PVBJ, Naziriwo BB, Madadi VO, Wafula GA, Kizza PN-, Henrik K.  2015.  Occurrence, abundance and Distribution of Benthic Macro-invertebrates in the Nyando River Catchment, Kenya. Africa Journal of Physical Sciences. 40(4):373-392.
Atieno, A’o D, Oyoo WS, Ogangu JI, den Paul VB, Bbosa NB, Odongo MV, Angoe WG, Henrik K, Peter N-K.  2015.  Organochlorine pesticide residue levels in soil from the Nyando River Catchment, Kenya. Africa Journal of Physical Sciences. 2.(1):18-32.
Ndunda, EN, Madadi VO, Mizaikoff B.  2015.  An alternative clean-up column for Polychlorinated Biphenyls in solid matrices. Environmental Science. Processes and Impacts, Royal Society of Chemistry. 17(12):2101-2109,.

2014

Kemboi, AK, Mbugua JK, Madadi VO, Guto PM, Kamau GN.  2014.  Adsorption Characteristics of Captafol Pesticide by Sediment and Soil Samples: Apparent Thermodynamic Properties Using Spectroscopic Methods. International Journal of BioChemiPhysics. 22:61-68.
Mbugua, JK, Kemboi A, Michira IN, Madadi VO, Zaranyika MF, Kamau GN.  2014.  Adsorption of Atrazine pesticide by sediment and soil samples: Effect of Equilibration Time on the Freundlich Parameter (n). International Journal of BioChemiPhysics. 22:31-41.
Judth, K, Vincent MO, Geoffrey KN.  2014.  Impact of longterm Inorganic Fertilization with Emphasis on Heavy metals, Soil pH and Total Organic Carbon on Maize Farm soils in Trans Nzoia Kenya. . International Journal of Science and Technologe. 2(11):183-188. Abstract

This research was carried out to analyze the effect of long term use of inorganic fertilizers on the Cd, Cr, Cu, Pb, Zn, soil pH and TOC in maize farm soils in Kenya. Samples of soil were collected from 12 experimental sites from Kerita farm that has experienced more than 20 years of inorganic fertilizer application and 2 samples from the control site (Kiptuimet primary school), Trans Nzoia in Kenya while fertilizer samples were purchased from the nearby Kolongolo Market. Results obtained showed that the mean concentration for Cu, Pb, Cr and Zn in maize farm soils was 8.52±1.56mg/kg, 37.72±3.44 mg/kg, 42.11±3.25 mg/kg and 29.36±2.74 mg/kg, respectively while the mean concentration for Cu, Pb, Cr and Zn in the control soils was 5.12±0.71 mg/kg, 18.98±0.88 mg/kg, 19.15±1.56 mg/kg and 14.71±0.63 mg/kg respectively. The mean concentration for Cu in both the control site and maize farm soils was below the detectable limits of the instrument. Soil Ph in maize farm soils and control site was 5.034±0.25 and 6.35±0.21 respectively while soil TOC was 1.11±0.87% and 0.915±0.01% in maize farm soils and control site respectively. The results revealed that maize farm soils had higher levels of heavy metals than the control site suggesting that inorganic fertilizers had had an impact. However the concentration of these toxic elements after long term use of inorganic fertilizers did not exceed the maximum allowable levels set by the USEPA and WHO. Also the levels of these metals in the inorganic fertilizers used in the maize farms were within acceptable levels set by the USEPA and Kenyan standards. Soil pH levels showed a difference between the maize farms and the control site with control having higher pH values than the maize farm soils indicating long term application of inorganic fertilizers effect on soil pH. However both the two sites had generally a low pH of less than 7.0 which was attributed to the composition of the parent rock from which the soils were formed and inherent factors affecting soil pH
which cannot be changed. There was a difference in total organic carbon values between the maize farms and the control site with higher values of TOC in maize farm soils compared to the control site indicating that long-term chemical fertilizer application alone can increase soil total organic carbon.
Keywords: Heavy Metals, Soil pH, TOC, Fertilizers, Maize Farms, Kenya

Abong’o, DA, Wandiga SO, Jumba IO, Madadi VO, Kylin H.  2014.  Impacts of Pesticides on Human Health and Environment in the River Nyando Catchment, Kenya. Best: International Journal of Humanities, Arts, Medicine and Sciences (BEST: IJHAMS) ISSN( E): 2348-0521. 2(3):1-14. Abstract

River relies on rain fed agriculture. Important crops grown include cereals, cash crops fruits and vegetables. Farming is one of the contributors’ of pollution to Lake Victoria. Organophosphates and other banned organochlorine pesticides such as lindane, aldrin and dieldrin were used by farmers. The pesticides transport was by storm water run-off and air drift into the lake. Environmental risk assessment background information was collected through questionnaire and interviews of farmers to determine knowledge and safe use of pesticides. Fourteen pesticides were identified as commonly used of which four are toxic to bees and five to birds. The farmers identified declines in the number of pollinating insects, the disappearance of Red-billed Oxpecker (Buphagus erythrorthynchus) and wild bird’s fatalities. The general knowledge among farmers about chemicals risks, safety, and chronic illnesses was low. Activities that increases environmental awareness and safety of pesticides should be initiated by the agrochemical firms and government
KEYWORDS: Environment, Farming, Lake Victoria, Pesticides

2013

Gall, AM, Madadi V, Shisler JL, Mariñas BJ.  2013.  The Safe Global Water Institute: An integrated, collaborative approach for improving drinking water and sanitation globally. Water Environment Federation, Disinfection 4. :184-187., USA: Water Environment Federation

2012

Mbugua, JK, Michira IN, Kagwanja SM, Madadi VO, Zeranyika M, Kamau GN.  2012.  Adsorption of 2,4,4,5,6-Tetrachloroisophthalonitrile (Chlorothalonil) by Nairobi River Sediments: Adsorption characteristics and Related Thermodynamic Data. International Journal of BioChemiPhysics. 20:25-37.

2009

Naiziriwo, BB, Wandiga SO, Madadi VO, Abongo DA.  2009.  Physicochemical parameters and magnetic speciation of Iron in Nakivubo Channel and Lake Victoria waters. Lakes and Reservoirs. 14:127-137. Abstract

Magnetic speciation technique was used for the determination of iron species in Nakivubo Channel and Lake Victoria waters. The method consisted of a column of supported Dowex 1-X18, 20–50 US mesh (Cl) surrounded by movable permanent magnets. Dowex was supported by a porous material to permit adequate passage of the eluent through the column. In the presence of an external magnetic field, enhanced capacity for adsorption of iron III was observed. The enhanced capacity is primarily due to the magnetic field produced and ion exchange sorption mechanism. The results show that, most of the Iron in Nakivubo Channel waters is in reduced ferrous form while, in the Lake Victoria waters, it exists in the oxidized ferric form. Physicochemical parameters for the field samples are discussed in this study. Turbidity levels in catchments with substantial vegetation were significantly lower than those without. pH values up to 13 was observed for some of the point source. The physicochemical parameters along Nakivubo Channel waters were relatively higher than the Lake Victoria waters indicating slow increasing pollution load along the Nakivubo Channel.

Wandiga, SO, Madadi VO.  2009.  Water quality issues in East Africa. Handbook of Water purity and Quality.. , USA: 1st Ed. Satinder Ahuja. Academic Press Elsevier. Int. ISBN. 978-01-12-374192-9. Pg. 39-65 Abstract

The paper shows that in the analysis of a queuing system with fixed-size batch arrivals, there emerges a set of polynomials which are a generalization of Chebyshev polynomialsof the second kind. The paper uses these polynomials in assessing the transient behaviour of the overflow (equivalently call blocking) probability in the system. A key figure to noteis the proportion of the overflow (or blocking) probability resident in the transient component,which is shown in the results to be more significant at the beginning of the transient and naturally decays to zero in the limit of large t. The results also show that the significanceof transients is more pronounced in cases of lighter loads, but lasts longer for heavier loads.

2006

Wandiga, SO, Madadi VO, Kiremire BT, Kishimba MA.  2006.  Lake Victoria: Will it support life tomorrow? A case for abatement of pollution and eutrophication of fresh waters. Environment for Development: An Ecosystem Assessment of Lake Victoria Basin Environmental and Socio-Economic Status, Trends and Human Vulnerabilities. :61-76., Nairobi: UNEP-PASS

2005

Madadi, VO, Wandiga SO, Jumba IO.  2005.  The status of persistent Organic pollutants in Lake Victoria catchments. A paper presented at the 11 th. :(2)pg.107-112., Nairobi, Kenya: ILEC Abstract

The paper shows that in the analysis of a queuing system with fixed-size batch arrivals, there emerges a set of polynomials which are a generalization of Chebyshev polynomialsof the second kind. The paper uses these polynomials in assessing the transient behaviour of the overflow (equivalently call blocking) probability in the system. A key figure to noteis the proportion of the overflow (or blocking) probability resident in the transient component,which is shown in the results to be more significant at the beginning of the transient and naturally decays to zero in the limit of large t. The results also show that the significanceof transients is more pronounced in cases of lighter loads, but lasts longer for heavier loads.

2004

Madadi, VO, Wandiga SO, Jumba IO.  2004.  Mineralization Versus Degradation of 2,4-D in Tropical Soil. Inaugural conference Proceedings Analysis of Pesticides for a Better Environment, Public Health and Competitive Agricultural and Aquatic Exports. :49-54., Arusha - Tanzania: The African Network for Chemical Analysis of Pesticides (ANCAP)
Getenga, ZM, Madadi VO, Wandinga SO.  2004.  Studies of degradation of 2,4-D and metribuzin in soil under controlled conditions. Bull. Environ. Contam. Toxicol. . 72(3):504-513..: Bull. Environ. Contam. Toxicol AbstractWebsite

The paper shows that in the analysis of a queuing system with fixed-size batch arrivals, there emerges a set of polynomials which are a generalization of Chebyshev polynomialsof the second kind. The paper uses these polynomials in assessing the transient behaviour of the overflow (equivalently call blocking) probability in the system. A key figure to noteis the proportion of the overflow (or blocking) probability resident in the transient component,which is shown in the results to be more significant at the beginning of the transient and naturally decays to zero in the limit of large t. The results also show that the significanceof transients is more pronounced in cases of lighter loads, but lasts longer for heavier loads.

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