Extractable Zinc, Copper, Iron, and Manganese

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Concentrations of zinc, copper, iron, and manganese (Zn, Cu, Fe, and Mn) are determined by treating a 10 gram scoop of air-dried of soil with 20 milliliters of DTPA (Diethylenetriamine-pentaacetic acid) extracting solution. After shaking for two hours, the sample is filtered and the extract analyzed by an inductively coupled plasma atomic emission spectrophotometer (ICP-AES). The results are reported as parts per million (ppm) for each metal in soil.