Abstract: Eleven approaches were employed to evaluate degree of heavy metals pollution in surface sediment from the Aden coast, Southern Yemen, was investigated by applying a set of complementary sediment quality assessment methods: (1) Comparison with the background value, (2) Sediment Quality Guidelines (SQG), (3) Toxicity guidelines for adverse biological effects, (4) Enrichment factor (EF), (5)Geo-accumulation index (Igeo), (6) Quantification of contamination index (QoC), (7) Contamination factor (Cf), (8) Degree of contamination (Dc), (9) Pollution Load Index (PLI), (10) Potential ecological risk factor (Er), and (11) Potential ecological risk index (RI). The heavy metal concentrations in the Aden coast sediments ranged from 0.6–2.92 μg g-1 for Cd, 9.7-26.4 μg g...........
Keywords: heavy metals, assessment,; risk index, sediment, Gulf of Aden
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