The concentration of asenic in each standard solution corresponds to the vertical grid lines pf the calibration curve as shown. This curve is ten used to determine the concentration of the two unknown solutions shown on the right . We first find the absorbances of the unknowns on the absorbance axis of the plot and then read the corresponding concentrations on the concentration axis. The lines leading from the cuvettes to the calibration curve show that the concentrations of arsenic in the two deer samples were 16 ppm and 22 ppm,respectively