Copper in salt water near the dischargeof a sewage treatment plant is determined by first seperating andconcentrating it by solvent extraction of its dithizone chelate atpH 3 into a methylene chloride and then evaporating the solvent,ashing the chelate to distroy the organic portion, and titratingthe copper with EDTA. Three 1-L portions of the sample are eachextracted with 25 mL portions of methylene chloride and theextracts are combined in a 100-mL volumetric flask and diluted to volume. A 50-mL aliqout is combined in a 100mL volumetric flask anddiluted to volume. A 50 mL aliqout is evaporated, ashed, andtitrated. If the EDTA solution has a CaCO3 titer 2.69 mg/mL and2.67mL is required for titration of the copper, what is the concentration of the copper in the seawater?