Water and Wastewater Laboratory Techniques, Second Edition by Water Environment Federation

Author:Water Environment Federation [Federation, Water Environment]
Language: eng
Format: epub
ISBN: 9781572783560
Publisher: Water Environment Federation
Published: 2019-03-01T08:00:00+00:00

FIGURE 7.5 Locating an absorbance value intersection with the calibration curve.

There are several important characteristics of the calibration curve in Figure 7.4. First, the set of data points actually curves. This is not a problem as long as the response changes continuously as the concentration increases. However, when the response flattens out, the increased concentrations of analyte do not give differing results. This phenomenon is called saturation and is illustrated in Figure 7.7. In the example, saturation of the colorimeter response has occurred at phosphate concentrations of 2.0 mg/L and higher.

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