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instrument reading was 46%, the 40 line and the 6 column would be
selected. The test result would be 0.78 mg/L iron (Fe).
If in Step 3, absorbance values are measured, plot the results on linear-
linear paper. Plot the absorbance value on the vertical scale and the
concentration values on the horizontal scale. Increasing absorbance
values are plotted from bottom to top and increasing concentration
values are plotted from left to right. Values of 0.000 absorbance and 0
concentration will both begin in the bottom left corner of the graph. A
calibration table can be extrapolated from the curve or concentration
values and read directly from the curve in the graph.
Figure 3 Calibration Curve Example
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