2.3. Calculation of copper uptake

JG Jerwin Lawrence C. Go
CM Cynthia F. Madrazo
AO Aileen H. Orbecido
MC Ma. Ellenita G. de Castro
CD Custer C. Deocaris
LB Lawrence P. Belo
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The copper uptake was measured by filtering the extracted aliquots then vaporizing them in an Atomic Absorption Spectrophotometer (Shimadzu AA-6300). The corresponding calibration curve was constructed using 0.05, 1, 5, 10 & 20 ppm Cu solutions made from copper sulfate pentahydrate with the proportional amount of liquid fertilizer. With the final liquid concentration and dry plant mass known, the copper removed was calculated through a mass balance. In Eq. (1), the amount of copper removed, q, was taken to be the difference between the original (CoVo) and the final (CV) mass of copper in the system on a per dry plant mass basis. A summary of the steps performed in shown in Figure 1 below.

Summary of the experimental procedures.

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