1. Moslempour ME, Shahdadi S. Assessment of heavy metal contamination in soils around of Khash Cement Plant, SE Iran. Iran J Earth Sci 2013; 5(2): 111-118.
2. Ujoh F, Alhassan MM. Oxides and heavy metals concentration around a cement plant at Yandev, Central Nigeria. Int J Plant Soil Sci 2014; 3(6): 777-789.
3. Al-Omran AM, El-Maghraby SE, Nadeem MAE, El-Eter AM, Al-Qahtani SMI. Impact of cement dust on some soil properties around the cement factory in Al-Hasa Oasis, Saudi Arabia. American-Eurasian J Agric Environ Sci 2011; 11(6): 840-846.
4. Singh J, Kalamdhad AS. Effects of heavy metals on soil, plants, human health and aquatic life. Int J Res Chem Environ 2011; 1(2): 15-21.
5. Wufem BM, Ibrahim AQ, Maina HM, Gungsat NJ, Nvau J. The impacts of cement dust deposits on soil available micronutrients. Int J Sci Eng Appl 2014; 3(4): 53-62.
6. Egbe ER, Nsonwu-Anyanwu AC, Offor SJ, Usoro CAO, Etukudo MH, Egbe DI. Cement dust exposure and perturbations in some elements and lung and liver functions of cement factory workers. J Toxicol 2016; 2016:1-7.
7. He Z, Shentu J, Yang X, Baligar VC, Zhang T, Stoffella PJ. Heavy metal contamination of soils: sources, indicators, and assessment. Journal of Environmental Indicators 2015; 9:17-18.
8. United States Environmental Protection Agency (US EPA).Supplemental guidance for developing soil screening levels for superfund sites. Office of Solid Waste and Emergency Response, Washington, D.C. 2002. http://www.epa.gov/superfund/health/conmedia/soil/index.htm
9. Ehsanul K, Sharmila R, Ki-Hyun K, Hye-On Y, Eui-Chan J, Yoon SK, et al. Current status of trace metal pollution in soils affected by industrial activities. Scientific World Journal 2012; 2012:1-18.
10. Lameed GA. Environmental impact assessment of cement factory production on biodiversity: a case study of UNICEM Calabar Nigeria. World J Biol Res 2008; 1: 1–7.
11. Association of official analytical chemists (AOAC).Official methods of analysis of the AOAC, Methods 932.06, 925.09, 985.29, 923.03. 15th ed. Association of official analytical chemists. Arlington, VA, USA, 1990.
12. Everson M E. Spectrophotometric techniques. In: Burtis CA, Ashwood ER, eds. Tietz textbook of Clinical Chemistry, 3rd ed, Philaelphia, W. B. Saunders Co. 1999:75-93.
13. Baran A, Wieczorek J. Application of geochemical and ecotoxicity indices for assessment of heavy metals content in soils. Arch Environ Prot 2015; 41(2):54–63.
14. Müller G. Index of geo-accumulation in sediments of the Rihne River. Geojournal 1969; 2: 108–118.
15. Loska K, Wiechula D, Barska B, Cebula E, Chojnecka A. Assessment of arsenic enrichment of cultivated soils in Southern Poland. Pol J Environ Stud 2003; 12(2): 187–192.
16. Duzgoren-Aydin NS, Wong CSC, Aydin A, Song Z, You M, Li XD. Heavy metal contamination and distribution in the urban environment of Guangzhou, SE China. Environ Geochem Health 2006; 28: 375-391.
17. Wei B, Yang L. A review of heavy metal contaminations in urban soils, urban road dusts and agriculture soils from China. Microchem J 2010; 94: 99–107.
18. Håkanson L. An ecological risk index for aquatic pollution control-a sedimentological approach. Water Res 1980; 14: 975-1001.
19. WHO. Safety evaluation of certain food additives and contaminants. International Programme on Chemical Safety. WHO Food Additive, 2000: Series 52.
20. Codex Alimentarius Commission. Joint FAO/WHO Food additives and contaminants. Joint FAO/WHO food Standards program 2001: ALINORM 01/12A: 1-289.
21. USEPA. Human health risk assessment guidiance. based concentration. Department of Environmental Quality Environmental Cleanup Program. 2010. https://www.oregon.gov/deq/FilterDocs/HumanHealthRiskAssessmentGuidance.
22. Codex Alimentarious Commission. Joint FAO/WHO food standards programme. Codex General Standard for Contaminants and Toxins in Foods 1969: Doc No.Cx/FAC 96/17.
23. WHO/FAO. Joint FAO/WHO Food Standard Programme Codex Alimentarius Commission. Report of the Thirty Eight Session of the Codex Committee on Food Hygiene, Houston, United States of America 2007: ALINORM 07/ 30/13.
24. Al-Khashman AO, Shawabkeh AR. Metal distribution in soils around the cement factory in Southern Jordan. Environ Pollut 2006; 140(3): 387–394.
25. Okoro HK, Orimolade BO, Adebayo GB, Akande BA, Ximba BJ, Ngila JC. An Assessment of heavy metals contents in the soil around a cement factory in Ewekoro, Nigeria using pollution indices. Pol J Environ Stud 2017; 26(1): 221-228.
26. Rout GR, Das P. Effect of metal toxicity on plant growth and metabolism: I. Zinc. Agronomie, EDP Sciences, 2003: 23 (1): 3-11.
27. Wyszkowska J, Borowik A, Kucharski M, Kucharski J. Effect of cadmium, copper and zinc on plants, soil microorganisms and soil enzymes. J Elem 2013; 18(4): 769–796
28. Schuhmacher M, Bocio A, Agramunt MC, Domingo JL, de Kok HAM. PDCC/F and metal concentration in soil and herbage samples collected in the vicinity of a cement plant. Chemosphere 2002; 48: 209-217.
29. Ogunkunle CO, Fatoba PD. Pollution load and ecological risk assessment of soil heavy metals around a mega cement factory in southwest Nigeria. Pol J Environ Stud 2013; 22(2): 47-493.
30. Adekola FA, Inyinbor AA, Abdul Raheem AMO. Heavy metals distribution and speciation in soils around a mega cement factory in North-central Nigeria. Ethiop J Environ Stud Manag 2012; 5(1): 11-19.
31. Mandal A, Voutchkov M. Heavy metals in soils around the cement factory in Rockfort, Kingston, Jamaica. Int J Geosciences 2012; 2: 48-54.
32. Facchinelli A, Sacchi E, Mallen L. Multivariate statistical and GIS–based approach to identify heavy metal sources in soils. Environ Pollut 2001; 114: 313-324.
33. Guala SD, Vega FA, Covelo EF. The dynamics of heavy metals in plant–soil interactions. Ecol Modell 2010; 221:1148– 1152.
34. Lugauskas A, Levinskaite L, Peèiulte D, Repeèkienë J, Motuzas A, Vaisvalavièius R, et al. Effect of copper, zinc and lead acetates on microorganisms in soil. Ekologija 2005;1:61-69.
35. Paul A, Wauters G, Paul AK. Nickel tolerance and accumulation by bacteria from rhizosphere of nickel hyperaccumulatores in serpentine soil ecosystem of Andaman, India. Plant Soil 2007; 293(1-2): 37-48.