COPPER (ll) ION Standard Preparation DataCopper (ll) Stock Solution was 1000.0 mg/L Buret Readings Standard 1 Standard 2 Standard 3 Standard 4 Standard 5Initial (mL) 6.32 7.38 9.5 12.38 10.28Final (ml) 7.38 9.5 12.38 16.52 16.02 Copper ISE DataPotential (mV) Standard 1 —73Standard 2 —58Standard 3 —48Standard 4 —40Standard 5 —31Estuary water #1 —44Estuary water #2 —41 Estuary water #3 —42