oalib

OALib Journal期刊

ISSN: 2333-9721

费用：99美元

投稿

时间不限

( 2673 )

( 2672 )

( 2208 )

( 2024 )

自定义范围…

匹配条件： “Chukwujindu M.A. Iwegbue” ，找到相关结果约857044条。
列表显示的所有文章，均可免费获取
第1页/共857044条
每页显示 条
Metal Contents in Some Brands of Biscuits Consumed in Southern Nigeria
Chukwujindu M.A. Iwegbue
American Journal of Food Technology , 2012,
Abstract: The concentrations of zinc, iron, chromium, calcium, magnesium, nickel, lead, copper, cobalt and cadmium were determined in six major classes of biscuits in Nigerian market after acid digestion by flame atomic absorption spectrophotometry. The mean concentrations of metals in various biscuit classes ranged from 29.06-49.27, 45.02-109.00, 0.39-0.72, 0.01-2.90, 205.64-395.27, 118.10-121.30, 2.15-4.88, <0.001-1.07, 0.53-5.04, nd-1.30, 0.03-0.05 g g-1 for Zn, Fe, Cr, Mn, Ca, Mg, Ni, Pb, Cu. Co and Cd, respectively. The estimated daily intake in g kg-1 body weight is below the prescribed Tolerable Daily Intake (TDI) values for each metal except for nickel.
OCCURRENCE AND PROFILE OF POLYCYCLIC AROMATIC HYDROCARBONS IN COALS AND SHALES FROM EASTERN NIGERIA
Jude .E. Ogala,Chukwujindu M.A. Iwegbue
Petroleum and Coal , 2011,
Abstract: The concentrations and profiles of polycyclic aromatic hydrocarbons (PAHs) in coal and shale samplesfrom eastern Nigeria were examined. The total concentrations of PAHs in the samples ranged from304– 4082 μgkg-1 and 274 – 1815 μgkg-1 for coal and share samples respectively. The profiles of PAHs inthe coal and shale samples differed significantly. The coal samples had higher PAHs concentrationsthan the shale samples. In the coal samples 4-rings PAHs showed predominance over 2, 3, 5-and 6-rings polycyclic aromatic hydrocarbons while 3-rings polycyclic aromatic hydrocarbons showedpredominance over 2,4,5 and 6-rings PAHs in the shale samples. The results indicate coal from easternNigeria are characterized with high contents of 3 and 4-rings PAHs and poorer in 2,5 and 6-rings PAHs.This suggests that the coal samples are from seams of paralic origin.
Ecology and Abundance of Oligochaetes as Indicators of Organic Pollution in an Urban Stream in Southern Nigeria
Francis O. Arimoro,Robert B. Ikomi,Chukwujindu M.A. Iwegbue
Pakistan Journal of Biological Sciences , 2007,
Abstract: A study of the aquatic oligochaetes of an organically polluted segment of an urban stream in Southern Nigeria was carried out to assess the ecological impact of abattoir effluent. Three stations 1, 2 and 3 were selected from upstream of the site receiving abattoir effluent, the impacted site and its down stream, respectively. Among the water quality variables, conductivity, dissolved oxygen, BOD5, Nitrate-nitrogen, Phosphate-phosphorus and water hardness were significantly different (p<0.05) among the stations. Orthogonal comparison using Duncan’s multiple range test showed that station 2 (the impacted site) was the cause of the difference. A total of 14 species of oligochaetes were identified with 13 (92.8%) occurring in the impacted station. Tubifex, Dero limnosa and Nais communis were the dominant taxa, less frequent were Stylaria, Aelosoma and Lumbriculus variegatus (Muller). Pistina and Chaetogaster species were sporadically present. The density of the different taxonomic groups differed among the stations with the impacted station accounting for the greatest abundance and diversity of the organisms. The organic wastes from the abattoir not only altered the water chemistry but also stimulated the abundance of oligochaete worms.
Trace Metal Contents in Some Brands of Canned Tomato Paste in Nigerian Market
Chukwujindu M.A. Iwegbue,Chukwudumebi L. Overah,Sarah O. Nwozo,Godwin E. Nwajei
American Journal of Food Technology , 2012,
Abstract: Concentrations of metals (copper, zinc, lead and iron) were examined in some popular brands of canned tomato paste in Nigerian markets with a view of providing information on the risk associated with the consumption of these products. Samples of some popular brands of tomato pastes canned in metallic containers were analyzed for levels of copper, zinc, lead and iron after acid digestion by atomic absorption spectrophotometry. The mean concentrations (mg kg-1) ranged from <0.9-4.28 for Cu, 0.25-10.75 for Zn, <0.3-1.82 for Pb and <1.0-112.8 for Fe. The concentrations of the metals examined in the samples were present at levels below statutory limits in foods except for lead. This may pose a real danger to consumers, since tomato paste is so commonly consumed and bioaccumulation of Pb can have serious consequence to human health.
Concentrations and exposure risks of some metals in facial cosmetics in Nigeria
Bice S. Martincigh,Chukwujindu M.A. Iwegbue,Francisca I. Bassey,Godswill O. Tesi,Grace Obi
- , 2016, DOI: 10.1016/j.toxrep.2016.04.004
Abstract: The concentrations of nine metals (Cd, Pb, Ni, Cr, Co, Cu, Fe, Mn and Zn) were determined in lip sticks, lip glosses, lip balms, eye pencils, eyeliners, eye shadows, blushes, mascaras and face powders. The study was aimed at providing information on the risk associated with human exposure to metals in these facial cosmetic products. The concentrations of metals in the samples were measured by atomic absorption spectrometry after digestion with a mixture of nitric acid, hydrochloric acid and hydrogen peroxide. The mean concentrations of metals in these facial cosmetics ranged from 3.1 to 8.4 μg g？1 Cd, 12–240 μg g？1 Pb, 9.1–44 μg g？1 Cr, 18–288 μg g？1 Ni, 1.6–80 μg g？1 Cu, 7.9–17 μg g？1 Co, 2.3–28 mg g？1 Fe, 12–230 μg g？1 Mn, and from 18 to 320 μg g？1 Zn. The concentrations of Ni, Cr and Co were above the suggested safe limit of 1 μg g？1 for skin protection, while Cd and Pb were above the Canadian specified limits. The systemic exposure dosage (SED) values for these metals obtained from the use of these facial cosmetic products were below their respective provisional tolerable daily intake (PTDI)/or recommended daily intake (RDI) values. The margin of safety values obtained were greater than 100 which indicated that the concentrations of the metals investigated in these facial cosmetics do not present considerable risk to the users except in the case of face powders
Evaluation of human exposure to metals from some commonly used hair care products in Nigeria
Bice S. Martincigh,Chukwujindu M.A. Iwegbue,Godwin E. Nwajei,Grace Obi,Omotekoro S. Emakunu
- , 2016, DOI: 10.1016/j.toxrep.2016.10.001
Abstract: The concentrations of nine metals, namely, cadmium (Cd), lead (Pb), chromium (Cr), copper (Cu), cobalt (Co), nickel (Ni), manganese (Mn), zinc (Zn), and iron (Fe), were determined in 26 brands of hair care products including hair relaxers, conditioners and shampoos. The study was aimed at providing information on the possible risks arising from heavy metals associated with the use of these products. The concentrations of the metals were determined by means of atomic absorption spectrophotometry after digestion of the samples with a mixture of acids. The concentrations of the respective metals in hair relaxers, shampoos and conditioners were found to be 0.8–2.5, 0.6–3.0,
Compost Maturity Evaluation and its Significance to Agriculture
Chukwujindu M.A. Iwegbue,A.C Egun,F.N. Emuh,N.O. Isirimah
Pakistan Journal of Biological Sciences , 2006,
Abstract: One of the main obstacles to the successful utilization of compost in agriculture is the lack of reliable quality criteria and understanding the transformation of organic matter, which take place throughout the whole process. Proper evaluation of composts maturity essential for establishment of such criteria. Because of the diversity of origin of composts. It is impossible to use a single method to evaluate compost maturity. It is best done by a combination of methods. A good index of compost maturity should have an overall trend describable by a monotonic function. Methods for evaluating composts maturity can be categorized into (1) chemical analysis (C/N, CEC and nitrification) (2) physical analysis (odour and temperature) (3) spectroscopic analysis (FTIR and 13C-NMR) (4) plant bioassay (germination and plant growth) (5) chromatographic analysis (sephadex fractionation) (6) degree of humification (HI, DH and HR) (7) microbial analysis (respiration). These tests vary in precision, simplicity, costs, duration and approach. Plant bioassays are considered the most direct test for compost maturity since it shows the effect of compost maturity on plant growth and other maturity tests are correlated with plant growth performance. Spectroscopic methods, sephadex fractionation and degree of humification give an insight to the feasibility of starting material to be transformed, the level of humification and the quality of the humic fraction and the efficiency of a given composting process.
Heavy Metal Composition of Some Imported Canned Fruit Drinks in Nigeria
Chukwujindu M.A. Iwegbue,S.O. Nwozo,E.K. Ossai,G.E. Nwajei
American Journal of Food Technology , 2008,
Abstract: Concentrations of cadmium, lead, chromium, nickel, copper, manganese and zinc in six brands of fruit drinks was investigated. The concentration of the heavy metals showed appreciable (p<0.05) variability within a brand except for Pb and Zn in orange brand. However, apparent and significant variability exist when brands are compared. The mean levels of the studied metals varies between 2.29-18.29 ppm for Fe, 1.41-7.19 ppm for Cu, 0.002-0.89 ppm for Cr, 0.06-1.93 ppm for Pb, 0.21-1.00 ppm for Ni, 0.006-11.29 ppm for Mn, 0.69-1.25 ppm for Zn and 0.002-0.49 ppm for Cd, the levels of these metals exceeded statutory safe limits except for Mn, Zn and Fe.
Risk of human exposure to metals in some household hygienic products in Nigeria
Bice S. Martincigh,Bulouebibo Lari,Chukwujindu M.A. Iwegbue,Francis E. Egobueze,Godswill O. Tesi,Godwin E. Nwajei,Omotekoro S. Emakunu
- , 2019, DOI: 10.1016/j.toxrep.2019.08.014
Abstract:
Measurement of Different Types of Potato Chips by Inductively Coupled Plasma-Optical Emission Spectrometer  [PDF]
AL-rajhi, M.A.
Journal of Analytical Sciences, Methods and Instrumentation (JASMI) , 2014, DOI: 10.4236/jasmi.2014.42007
Abstract:

Potato chips are considered as one of the most popular and preferable children’s foods in Saudi Arabia. The aim of this study was to examine the concentration of 12 chemical elements (i.e. Cd, Cr, Cu, Fe, Mg, Mn, Ni, Pb, Zn, As, Se and Al) in different types of potato chips. Samples were analyzed using an Inductively Coupled Plasma-Optical Emission Spectrometer (ICP-OES). The average concentrations of analyzed elements in all potato chips were examined and compared with the recommendations of international organizations concerned with food safety. From the human health point of view, this investigation showed that there was no possible health risk to consumers due to the intake of potato chips.

第1页/共857044条
每页显示 条


Home
Copyright © 2008-2020 Open Access Library. All rights reserved.