1. Abah J, Ubwa ST, Onyejefu DI, Nomor SA (2013) Assessment of some trace metals content of oreochromis niloticus obtained from river Okpokwu, Apa Benue State, Nigeria. Res J Chem Sci 3(3):70–75
2. American Public Health Association (APHA) (2012) Standard methods for the examination of water and wastewater, 22nd edn. American Public Health Association, Washington
3. Bhatia KKS, Jaiswal R (2006) Water quality conservation and need for publication awareness. Proceeding of seminar on water conservation and public awareness. Institute of Engineers, Roorkee, pp 276–280
4. Bureau of Indian Standards (BIS) 10500 (2012) Specification for drinking water. Indian Standards Institution, New Delhi, pp 1–5
5. Cavani A (2005) Breaking tolerance to nickel. Toxicology 209(2):119