1. Abbas M, Parveen Z, Iqbal M, Riazuddin M, Iqbal S, Ahmed M, Bhutto R (2010) Monitoring of toxic metals (cadmium, lead, arsenic and mercury) in vegetables of Sindh, Pakistan. Kathmandu Univ J Sci Engg Technol 6:60–65
2. Agarwal SK (2009) Heavy metal pollution. A.P.H. Publishing Company, New Delhi, pp 145–163
3. 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 under different regions of Pakistan. Pak J Bot 42:2691–2702
4. Alloway BJ, Ayres DC (1997) Chemical principles of environmental pollution, 2nd edn. Blackie academic and professional. Chapman and Hall, London, pp 208–211
5. Al-Omron AM, El-Maghraby SE, El-Eter AM, Al-Mohani H (2012) Long-term effect of irrigation with the treated sewage effluent on some soil properties of Al-Hassa Governorate. Saudi Arabia J Saudi Soc Agric Sci 11:15–18