Ecological risk evaluation of spent engine oil pollution using earthworm and microbial bioassays by Azorji John Paul Nnawuike, Angela Chika Udebuani, Nwachukwu Udodi Chibuike, Igwe Charles Ekene, Dike Kelechi Stanley, Nzenwa Peter Odinaka, Igbokwe Moses Chukwuebuka

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