References
- Ademoroti CMA. 1986. Levels of heavy metals on bark and fruit of trees in Benin City, Nigeria. J Environ Pollut (Series B) 11: 241-253. https://doi.org/10.1016/0143-148X(86)90043-1
- Aghabarati A, Hosseini SM, Maralian H. 2008. Heavy Metals Contamination of Soil and Olive Trees (Olea europaea L.) in Suburban Areas of Tehran, Iran. Res J Environ Sci 2: 323-329. https://doi.org/10.3923/rjes.2008.323.329
- Aichner B, Glaser B, Zech W. 2007. Polycyclic aromatic hydrocarbons and polychlorinated biphenyls in urban soils from Kathmandu, Nepal. Org Geochem 38: 700-715. https://doi.org/10.1016/j.orggeochem.2006.11.002
- Akhtar S, Naz S, Sultan MT, Mahmood S, Nasir M, Ahmad A. 2010. Physico-chemical attributes and heavy metal content of Mangoes (Mangifera indica l.) cultivated in different regions of Pakistan. Pak J Bot 42: 2691-2702.
- Alloway BJ. 2004. Contamination of soils in domestic gardens and allotments: a brief overview. Land Contam Reclam 12: 179-187. https://doi.org/10.2462/09670513.658
- Angew ON. 2007. Functional Foods. Trends in Food Science and Technology 30: 19-21.
- Arsingrin PS. 1999. Citrus Sinensis Information. In: Bennie and Simpson (Eds), Fruits. 2nd ed. Welford Publications, 258-261.
- Atta S, Zhou CY, Zhou Y, Cao MJ, Wang XF. 2012. Distribution and Research Advances of Citrus tristeza virus. J Integr Agric 11: 346-358. https://doi.org/10.1016/S2095-3119(12)60019-7
- Basha AM, Yasovardhan N, Satyanarayana SV, Reddy GVS, Vinod KA. 2014. Trace metals in vegetables and fruits cultivated around the surroundings of Tummalapalle uranium mining site, Andhra Pradesh, India. Toxicol Rep 1: 505-512. https://doi.org/10.1016/j.toxrep.2014.07.011
- Bernardi J, Licciardello C, Russo MP, Luisa CM, Carletti G, Recupero GR, Marocco A. 2010. Use of a custom array to study differentially expressed genes during blood orange (Citrus sinensis L. Osbeck) ripening. J Plant Physiol 167: 301-310. https://doi.org/10.1016/j.jplph.2009.09.009
- Chen Y, Wang C, Wang Z. 2005. Residues and source identification of persistent organic pollutants in farmland soils irrigated by effluents from biological treatment plants. Environ Int 31: 778-783. https://doi.org/10.1016/j.envint.2005.05.024
- Divrikli U, Horzum N, Soylak M, Elci L. 2006. Trace heavy metal contents of some species and herbal plants from Western Anatolia, Turkey. Int. J Food Sci Technol 41: 712-716. https://doi.org/10.1111/j.1365-2621.2005.01140.x
- Emenike GC, Ibezi P. 2017. Spatio-Temporal Analysis of Road Network of Selected Major Routes in Port Harcourt City, Nigeria. World J Res Rev 4: 20-23.
- Etebu E, Nwauzoma AB. 2014. A Review on Sweet Orange (Citrus sinensis L Osbeck): Health, Diseases and Management. Am J Res Commun 2: 33-70.
- Fatoba PO, Adepoju AO, Okewole GA. 2012. Heavy Metal Accumulation in the Fruits of Tomato and Okra Irrigated with Industrial Waste Effluents. J Ind Pollut Control 28: 103-107.
- Food and Agriculture Organization (FAO). 1998. Animal feeding and food safety (Food and Nutrition Paper - 69). Food and Agric Organ U. N, Rome, Italy, 48 pp.
- Food and Agriculture Organization of the United Nations (FAO). 2006. FAO Statistics. http://faostat.fao.org/default.aspx. Accessed 5 May 2017.
- Food and Agriculture Organization (FAO) International Fund for Agricultural Development (IFAD) or World Food Programme (WFP). 2013. The State of Food Insecurity in the World 2013. The multiple dimensions of food security. Rome. Available at www.org/docrep/011/idooe/oiooeoo.htm. Accessed 14 May 2017.
- Goudeau D, Uratsu SL, Inoue K, daSilva FG, Leslie A, Cook D, Reagan L, Dandekar AM. 2008. Tuning the orchestra: Selective gene regulation and orange fruit quality. Plant Sci 174: 310-320. https://doi.org/10.1016/j.plantsci.2007.11.017
- Hjortenkrans DS, Bergback BG, Haggerud AV. 2008. Transversal immission patterns and leachability of heavy metals in roadside soils. J Environ Monit 10: 739-746. https://doi.org/10.1039/b804634d
- Hung NM, Hiep NV, Dung BN, Hai NX. 2014. Lead Accumulation in Different Parts of Okra Plant (Abelmoschus esculentus). ARPN J Agric Biol Sci 9: 190-194.
- Igwegbe AO, Agukwe CH, Negbenebor CA. 2013. A survey of heavy metal (lead, cadmium and copper) contents of selected fruit and vegetable crops from Borno State of Nigeria. Res Inv Int J Eng Sci 2: 1-5.
- Jacobs DE, Clickner RP, Zhou JY, Viet SM, Marker DA, Rogers JW, Zeldin DC, Broene P, Friedman W. 2002. The prevalence of lead-based paint hazards in U.S. Housing. Environ Health Perspect 110: A599-A605.
- Kacalkova L, Tlustos P, Szakova J. 2014. Chromium, Nickel, Cadmium, and Lead Accumulation in Maize, Sunflower, Willow, and Poplar. Pol J Environ Stud 23: 753-761.
- Kalagbor IA, Naifa PB, Umeh JN. 2014. Analysis of Heavy Metals in Four Fruits from Sii and Zaakpon Communities in Khana, Rivers State. Int J Emerg Tech Adv Eng 4: 827-831.
- Lane SD, Martin ES. 1977. A Histochemical Investigation of Lead Uptake in Raphanus stivus. New Phytol 79: 281-286. https://doi.org/10.1111/j.1469-8137.1977.tb02206.x
- Lee SZ, Chang L, Yang HH, Chen CM, Liu MC. 1998. Absorption characteristics of lead onto soils. J Hazard Mater 63: 37-49. https://doi.org/10.1016/S0304-3894(98)00203-9
- Mausi G, Simiyu G, Lutta S. 2014. Assessment of selected heavy metal concentrations in selected fresh fruits in Eldoret Town, Kenya. J Environ Earth Sci 4: 1-8.
- McClintock N. 2012. Assessing Soil Lead Contamination at Multiple Scales in Oakland, California: Implications for Urban Agriculture and Environmental Justice. Applied Geography 35: 460-473. https://doi.org/10.1016/j.apgeog.2012.10.001
- Mmom PC, Fred-Nwagwu FW. 2013. Analysis of Landuse and Landcover Change around the City of Port Harcourt, Nigeria. Glob Adv Res J Geogr Reg Plan 2: 76-86.
- Nazli MF, Hashim NR 2010. Heavy Metal Concentrations in an Important Mangrove Species, Sonneratia caseolaris, in Peninsular Malaysia. Environ Asia 3: 50-55.
- Nicolosi E, Deng ZN, Gentile A, La Malfa S, Continella G, Tribulato E. 2000. Citrus phylogeny and genetic origin of important species as investigated by molecular markers. Theor Appl Genet 100: 1155-1166. https://doi.org/10.1007/s001220051419
- Obafemi AA, Eludoyin OS, Opara DR. 2011. Road Network Assessment in Trans-Amadi, Port Harcourt, Nigeria Using GIS. Int J Traffic and Transp Eng 1: 257-264.
- Okonkwo S, Okpala K, Opara MF. 2014. Assessment of Automobile Induced Pollution in an Urban Area (A Case Study of Port-Harcourt City, Rivers State, Nigeria). Chem Process Eng Res 25: 12-15.
- Oyegun CU, Adeyemo A. 1999. Port Harcourt Region. Port Harcout: Paragraphics, pp. 33-66.
-
Pehlivan E, Özkan AM, Dinc S, Parlayici S. 2009. Adsorption of
$Cu^{2+}$ and$Pb^{2+}$ ion on dolomite powder. J Hazard Mater 167: 1044-1049. https://doi.org/10.1016/j.jhazmat.2009.01.096 - Piccinelli AL, Garcia MM, Armenteros DM, Alfonso MA, Arevalo AC, Campone L, Rastrelli L. 2008. HPLC-PDA-MS and NMR Characterization of C-Glycosyl Flavones in a Hydroalcoholic Extract of Citrus aurantifolia Leaves with Antiplatelet Activity. J Agric Food Chem 56: 1574-1581. https://doi.org/10.1021/jf073485k
- Rosemary F, Vitharana UWA, Indraratne SP, Weerasooriya SVR. 2014. Concentrations of Trace Metals in Selected Land Uses of a Dry Zone Soil Catena of Sri Lanka. Trop Agri Res 25: 512-522.
- Roy S, Labelle S, Mehta P, Mihoc A, Fortin N, Masson C, Leblanc R, Châteauneuf G, Sura C, Gallipeau C, Olsen C, Delisle S, Labrecque M, Greer CW. 2005. Phytoremediation of heavy metal and PAH contaminated brownfield sites. Plant Soil 272: 277-290. https://doi.org/10.1007/s11104-004-5295-9
- Runk D. 2011. Urban gardens tainted with lead, arsenic. Associated Press. http://www.huffingtonpost.com. Accessed 18 Apr 2017.
- Saleh R, Cheraghi M, Lorestani B. 2017. Health Assessment of Heavy Metal Pollution (Cadmium, Lead, Arsenic) in Citrus Marketed in Tehran, Iran, 2015. Arch Hyg Sci 6: 171-177.
- Sanyaolu VT, Sanyaolu AAA, Fadele E. 2011. Spatial Variation in Heavy Metal Residue in Corchorus olitorious Cultivated along a Major Highway in Ikorodu- Lagos, Nigeria. J Appl Sci Environ Manage 15: 283-287.
- Schulin R, Curchod F, Mondeshka M, Daskalova A, Keller A. 2007. Heavy metal contamination along a soil transect in the vicinity of the iron smelter of Kremikovtzi (Bulgaria). Geoderma 140: 52-61. https://doi.org/10.1016/j.geoderma.2007.03.007
- Sharma P, Dubey RS. 2005. Lead toxicity in plants. Braz J Plant Physiol 17: 35-52. https://doi.org/10.1590/S1677-04202005000100004
- Sinegani AAS. 2007. Temporal and spatial variability of lead levels in Salsola kali near Razan-Hamadan highway. J Appl Sci Environ Manage 11: 143-146.
- Singh S, Zacharias M, Kalpana S, Mishra S. 2012. Heavy metals accumulation and distribution pattern in different vegetable crops. J Environ Chem and Ecotoxicol 4: 75-81.
- Tangahu BV, Abdullah SRS, Basri H, Idris M, Anuar N, Mukhlisin M. 2011. A Review on Heavy Metals (As, Pb, and Hg) Uptake by Plants through Phytoremediation. Int J Chem Eng 2011: 1-31.
- Taupeau C, Poupson J, Nome F, Lefevre B. 2001. Lead accumulation in the mouse Ovary after treatment-induced follicular atregia. Reprod Toxicol 15: 385-391. https://doi.org/10.1016/S0890-6238(01)00139-3
- Teichman J, Coltrin D, Prouty K, Bir WA. 1993. A survey of lead contamination in soil along Interstate 880, Alameda County, California. Am Ind Hyg Assoc J 54: 557-559. https://doi.org/10.1080/15298669391355035
- Umeuduji JE, Aisuebeogun A 1999. Relief and Drainage in Port Harcourt Region. Department of Geography and Environmental Management, University of Port Harcourt 1: 33-41.
- USDA. 2009. Importation of Tomatoes, Solanum lycopersicum, from the Economic Community of West African States (ECOWAS) into the Continental United States. A Qualitative, Pathway-Initiated Pest Risk Assessment.
- USEPA. 2016. Reviewing National Ambient Air Quality Standards (NAAQS). https://www.epa.gov/criteria-air-pollutants/naaqs-table. Accessed 6 May 2017.
- USEPA United States Environmental Protection Agency (USEPA). 1995. Method 3052: Microwave assisted acid digestion of siliceous and organically based matrices. Test methods for evaluating solid waste. http://www.epa.gov/osw/hazard/testmethods/sw846/online/3_series.htm. Accessed on 15 May 2017.
- USEPA. 1997. National Center for Environmental Assessment. US Environmental Protection Agency, Washington, DC, Exposure Factors Handbook: 1997 edition.
- Utang PB, Eludoyin OS, Ijekeye CL. 2013. Impacts of automobile workshops on heavy metals concentrations of urban soils in Obio/Akpor LGA, Rivers State, Nigeria. Afr J Agr Res 8: 3476-3482. https://doi.org/10.5897/AJAR2013.6753
- von Hoffen LP, Saumel I. 2014. Orchards for edible cities: Cadmium and lead content in nuts, berries, pome and stone fruits harvested within the inner city neighbourhoods in Berlin, Germany. Ecotoxicol Environ Safety 101: 233-239. https://doi.org/10.1016/j.ecoenv.2013.11.023
- Wang HY, Stuanes AO. 2003. Heavy metal pollution in air-water-soil-plant system of Zhuzhou City, Hunan Province, China. Water Air Soil Pollut 147: 99-107.
- Weli VE, Obisesan A. 2014. Spatial Analysis of Atmospheric Pollutants from Rumuolemeni Landfill, Port Harcourt using GIS. J Environ Earth Sci 4: 1-8.
- World Health Organization (WHO). 1995. Lead. Environmental Health Criteria, Geneva, pp 165.
- World Health Organization (WHO). 2015. Lead Exposure in African Children Contemporary Sources and Concerns. http://apps.who.int/iris/bitstream/10665/200168/1/9780869707876.pdf. Accessed 4 Jun 2016.
- Wu J, Edwards R, He X, Liu Z, Kleinman M. 2010. Spatial analysis of bioavailable soil lead concentrations in Los Angeles, California. Environ Res 110: 309-317. https://doi.org/10.1016/j.envres.2010.02.004
- Xu Q, Chen LL, Ruan X, Chen D, Zhu A, Chen C, Bertrand D, Jiao W, Hao B, Lyon MP, Chen J, Gao S, Xing F, Lan H, Chang J, Ge X, Lei Y, Hu Q, Miao Y, Wang L, Xiao S, Biswas MK, Zeng W, Guo F, Cao H, Yang X, Xu XW, Cheng YJ, Xu J, Liu JH, Luo OJ, Tang Z, Guo WW, Kuang H, Zhang HY, Roose ML, Nagarajan N, Deng XX, Ruan Y. 2013. The draft genome of sweet orange (Citrus sinensis). Nat Genet 45: 59-66. https://doi.org/10.1038/ng.2472
- Yami SG, Chandravanshi BS, Wondimu T, Abuye C. 2016. Assessment of selected nutrients and toxic metals in fruits, soils and irrigation waters of Awara Melka and Nura Era farms, Ethiopia. Springerplus 5: 2-12. https://doi.org/10.1186/s40064-015-1651-x