Fig. 5

RI variation in 3 years. a The potential ecological risk index (RI) was defined as the sum of the risk actors: RI = ∑Er. B. b The results through different 3 years the degree of contamination in bottom sediments
RI variation in 3 years. a The potential ecological risk index (RI) was defined as the sum of the risk actors: RI = ∑Er. B. b The results through different 3 years the degree of contamination in bottom sediments