Remaining Copper in the Residual Wastewater

Table 2 depicts the concentration of Cu that remained in the residual solution after being treated. The collected data have shown inaccuracies, such as having negative results and repeated results that prevent the researchers from observing accurate measurements. With the data having values that do not align with the related literature. A study by Swain et. al (2014) reveals that the concentration remaining in the wastewater decreases in direct proportion to the amount of concentration absorbed by the plant. The data shows the opposite which refrains the researchers from observing the correct measurements. The possible reason for this is an experimental error, such as human or instrumental error. It could mean that the calibration standards, particularly the zero (blank) standard.  It shows in your standard that there are significant amounts of the element detected but you tell the instrument to consider this signal as equivalent to zero concentration or that the samples are having the content below the detection point of the instrument.