Application Of Spons Callispongia Sp Origin Of Halong Water (Ambon Bay) As Biomonitoring Contamination Trace Metals Pb,Cr,Cr And Zn - Siahaya, Antho Netty (Jurusan Kimia, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Pattimura, 2014)