While significant work has been reported on the hydrometallurgical recovery of metals from PCBs using HNO3, HCl, H2SO4, and aqua-regia, aqua regia, is popular for the determination of the initial Cu content of PCB samples and has been observed to demonstrate excellent efficiency in Cu leaching than other leach solutions . It was important to determine the initial Cu content of the PCB to have a reference to which the efficiency of the test leach solution (mixture of malonic acid and H2O2) can be compared. Though PCBs contain many metals including Cu, Ag, Au, Sn, and Ni to state a few, Cu is the focus of this study because it has the single highest composition of all metals in most PCB samples including that of scrap laptop computers . The average Cu concentration in the PCB pieces was determined to be (0.84±0.13) mg/g (where 0.13 is the standard deviation of the mean), which is lower than that reported by other studies , and this was attributed to the fact that the Cu content in the PCBs of laptop computers are generally lower than that in other products like desktop computers and television sets . The relatively large error (standard deviation) in the Cu content value was attributed to a large variation in the Cu content in different parts of the large PCB from which the samples were cut .