Evaluation of anthropic influences in an estuarine system of Southeastern Brazilian Coast by applying enrichment factors in cores from Bertioga Channel, Sao Paulo state - Figueira, Rubens César Lopes; Sartoretto, Juliê Rosemberg; Salaroli, Alexandre Barbosa; Mahiques, Michel Michaelovitch de; Gonçalves, Cristina (E3S Web of Conferences : Proceedings of the 16th International Conference on Heavy Metals in the Environment, 2013)