ANALISIS KANDUNGAN LOGAM BERAT TEMBAGA (Cu) PADA KEPITING BAKAU (Scylla sp.) DI SUNGAI WONOREJO, SURABAYA = ANALYSIS OF HEAVY METAL COPPER (Cu) CONTENT IN MUD CRAB (Scylla sp.) AT WONOREJO RIVER, SURABAYA - HALIMATUS MEIRIKAYANTI, 141411133017 (2018)