Adriano DC (2003) Trace Elements in Terrestrial Environments: Biogeochemistry, Bioavailability and Risks of Metals. (2nd edition). Springer, New York, NY, USA.
AOAC (2005) Official method of analysis (18th Edition), Association of Officiating Analytical Chemists International, Maryland, USA. pp. 2.3 - 2.8; 46.4.
Asci Y, Nurbas M, Acikel YS (2007) Sorption of Cd (II) onto kaolin as a soil component and desorption of Cd(II) from kaolin using rhamnolipid biosurfactant. J Haz Mat 139(1): 50–56
Asci Y, Nurbas M, Acikel YS (2008) A comparative study for the sorption of Cd (II) by soils with different clay contents and mineralogy and the recovery of Cd(II) using rhamnolipid Biosurfactant. J Haz Mat 154(1–3): 663–673.
Chakrabart S (2015) Bacterial biosurfactant: Characterization, antimicrobial and metal remediation properties. Dissertation, Department of life science National Institute of Technology Rourkela Odisha. retrieved Nov 2018 from http://ethesis.nitrkl.ac.in/3113/. pp. 1-62
Chu W, Chan KH (2003) The mechanism of the surfactant aided soil washing system for hydrophobic and partial hydrophobic organics. Sci Total Environ 307(1–3): 83–92.
Davis AP, Singh I (1995) Washing of Zinc (II) from contaminated soil column. J Environ Eng 121(2): 174–
Dehghan-Noudeh G, Housaindokht M, Bazzaz BSF (2005) Isolation, characterization, and investigation of surface and hemolytic activities of a lipopeptide biosurfactant produced by Bacillus subtilis ATCC 6633. J Microbiol 43(3): 272–276.
Dermont G, Bergeron M, Mercier G, Richer-Lafl`eche M (2008) Soil washing for metal removal: A review of physical/chemical technologies and field applications. J Harzard Mater 152(1):1-31
Fiebig SD, Chung JC, Lee ST (1997) Biodegradation of polychlorinated biphenys (PCBs) in the presence of a bioemulsifier produced on sunflower oil. Biodeg 8: 67-75.
Gao Y, He J, Ling W, Hu H, Liu F (2003) Effects of organic acids on copper and cadmium desorption fromcontaminated soils. Environ Intl 29(5): 613–618.
Gombert D (1994) Soil washing and radioactive contamination. Environ Prog 13(2): 138–142.
Harborne AJ (1998) Phytochemical methods: A guide to modern techniques of plant analysis. 8th edition. Springer Netherlands publishers ISBN 976-0-412-57260-9. pp. 1-302
Hong KJ, Tokunaga S, Kajiuchi T (2002) Evaluation of remediation process with plant-derived biosurfactant for recovery of heavy metals from contaminated soils. Chemospher 49(4): 379–387.
Ivanković T, Hrenović J (2010) Surfactants in the environment. Arh Hig Rada Toksikol 61: 95-110. DOI: 10.2478/10004-1254-61-2010-1943
Khan S, Cao Q, Zheng YM, Huang YZ, Zhu YG (2008) Health risks of heavy metals in contaminated soils and food crops irrigated with wastewater in Beijing, China. Environ Poll 152(3): 686–692.
Kumari B, Singh SN, Singh DP (2012) Characterization of two biosurfactant producing strains in crude oil degradation. Proces Biochem 47: 2463-2471.
Kirpichtchikova TA, Manceau AL, Spadini F, Panfili M, Marcus A, Jacquet T (2006) Speciation and solubility of heavy metals in contaminated soil using X-ray microfluorescence, EXAFS spectroscopy, chemical extraction, and thermodynamic modeling. Geo Cosmoc Acta 70(9): 2163–2190.
Ling W, Shen Q, Gao Y, Gu X, Yang Z (2007) Use of bentonite to control the release of copper from contaminated soils. Austr J Soil Res 45(8): 618–623.
Luna J.M, Rufino RD, Sambbo CA (2016) Biosurfactant from Candida sphaerica UCP0995 exhibiting heavy metal remediation properties. Proc. Safety Environ. Protcl. 102: 558-566
Maier RM, Neilson JW, Artiola JF, Jordan FL, Glenn EP, Descher SM (2001) Remediation of metal-contaminated soil and sludge using biosurfactant technology. Intl J Occuptl Med Environtl Health 14(3): 241-248.
Maslin P, Maier RM (2000) Rhamnolipid-enhanced mineralization of phenanthrene in organic-metal co-contaminated soils. Biorem J 4(4): 295–308.
Maturi K, Reddy KR (2008) Extractants for the removal of mixed contaminants from soils. Soil Sed Cont17(6): 586–608.
McLaughlin MJ, Zarcinas BA, Stevens DP, Cook N (2000a) Soil testing for heavy metals. Comm Soil Sci Plant Anal 31(11–14): 1661–1700.
McLaughlin MJ, Hamon RE, McLaren RG, Speir TW, Rogers SL (2000b) Review: A bioavailability-based rationale for controlling metal and metalloid contamination of agricultural land in Australia and New Zealand. Austr J Soil Res 38(6): 1037–1086.
Mulligan CN, Yong RN, Gibbs BF, James S, Bennett HPJ (1999) Metal removal from contaminated soil and sediments by the biosurfactant surfactin. Environ Sci Technol 33(21): 3812–3820.
Mulligan CN, Yong RN, Gibbs BF (2001) Heavy metal removal from sediments by biosurfactant. J. Hazard Mat 85: 111-125
Mulligan CN, Yong RN, Gibbs BF (2004) On the use of biosurfactants for the removal of heavy metals from oil contaminated soil. Environ Prog 18(1): https://doi.org/10-1002/ep.670180140
Oberbremer A, Muller-Hurtig R, Wagner F (1990) Effect of the addition of microbial surfactants on hydrocarbon degradation in soil population in a stirred reactor. Appl Microbiol Biotechnol 32:485-489.
Ogbulie TE, Ogbulie JN, Umezuruike I (2008) Biodegradation of detergents by aquatic bacterial flora from Otammiri River, Nigeria. Afr J Biotech 7(6): 824-830. http://www.academicjournals.org/AJB
Ogbulie TE, Nwigwe HC, Iwuala MOE, Okpokwasili GC (2010) Study on the use of Monoculture and Multispecie systems in Bioaugumentation of crude oil Contaminated Agricultural soil. Nig J Microbiol 24(1): 2160-2167.
Ogbulie TE (2011) Phytoextraction of Nickel, Chromium, Lead and Copper from Crude oil polluted Agricultural soil. Intl J Tropl Agric Food Sys 5(2): 99-106. https://www.ajol.info/index.php/ijotafs/article/view/86542
Okore CC, Nwaehiri LU, Mbanefo ON, Ogbulie TE, Ugenyi AU, Ogbuka IB, Ejele AE, Okwujiako IA (2017a) Study on the production and antibacterial activities of biosurfactant produced from some bacterial species. Intl J Adv Res 5(7): 581-586
Okore CC, Nwaehiri LU, Mbanefo ON, Ogbulie TE, Ugenyi AU, Ogbuka IB, Ejele AE, Okwujiako IA (2017b) Study on effect of monovalent and divalent salts on the production of biosurfactant and emulsification index. Intl J Adv Res 5(6): 1875-1881
Okore CC, Nwaehiri LU, Mbanefo ON, Ogbulie TE, Ugenyi AU, Ogbuka IB, Ejele AE, Okwujiako IA (2017c) Study on microbial diversity of biosurfactant producing bacteria from contaminated environmental samples. Intl J Adv Res 5(6): 1387-1396
Okore CC, Nwaehiri LU, Mbanefo ON, Ogbulie TE, Ugenyi AU, Ogbuka IB, Ejele AE, Okwujiako IA (2017d) The use of random amplified polymorphic DNA (RAPD) to study the genetic variation of biosurfactant producing bacteria. Acad J Sci 07(03): 267–286
Okore CC, Mbanefo ON, Onyekwere BC, Onyewenjo S, Abba-Father CAM (2013) Isolation and characterization of biosurfactants producing bacteria from oil polluted soil. J Nat Sci Res www.iiste.org. 3(5): 119-122
Płociniczak MP, Płaza GA, Seget ZP, Cameotra SS (2011) Environmental Applications of Biosurfactants: Recent Advances. Intl J Mol Sci 12: 633-654.
Qi X, Xu X, Zhong C, Jiang T, Wei W, Song X (2018) Removal of Cadmium and Lead from contaminated soil using sophorolipids from fermented culture of Starmerella bombicola CGMCC 1576 fermentation. Intl J Environ Res Pub Health 15: 1-12
Roane TM, Pepper IL, Miller RM (1996) Microbial remediation of metals. In: Crawford RL, Crawford DL, (eds.) Bioremediation: Principles and Applications. United Kingdom: Cambridge Univ. Press. pp. 312–40.
Rufino RD, Rodrigues GIB, Campos-Takaki GM, Sarubbo LA, Ferreira SRM (2011) Application of a yeast biosurfactant in the removal of heavy metals and hydrophobic contaminant in a soil used as slurry barrier. Appl Environ Soil Sci. Article ID 939648. doi:10.1155/2011/939648. pp.1-7.
Tejowulan RS, Hendershot WH (1998) Removal of trace metals from contaminated soils using EDTA incorporating resin trapping techniques. Environ Pollutn 103(1):135–142.
USEPA (1990) Engineering bulletin: Soil washing treatment. Tech. Rep. EPA/540/2-90/017, Office of Emergency and Remedial Response, United States Environmental Protection Agency. Washington, DC, USA.
Wood AL, Bouchard DC, Brusseau ML, Rao PSC (1990) Cosolvent effects on sorption and mobility of organic contaminants in soils. Chemosph 21(4-5): 575–587.
Yuste L, Corbella ME, Turiegano MJ, Karison U, Puyet A, Rojo F (2000) Characterization of bacteria strains able to grow on high molecular mass residues from crude oil processing. FEMS Microbial Ecol 32:69-75.
Zhang H, Dang Z, Zheng LC, Yi XY (2009) Remediation of soil co-contaminated with pyrene and cadmium by growing maize (Zea mays L.). Intl. J. Environ. Sci. Technol. 6(2), 249–258.
Zhang MK, Liu ZY, Wang H (2010) Use of single extraction methods to predict bioavailability of heavy metals in polluted soils to rice. Comm Soil Sci Plant Anal 41(7): 820–831.
Zhao Q, Kaluarachchi J (2002) Risk assessment at hazardous waste-contaminated sites with variability of population characteristics. Environ Intl 28(1-2): 41–53.