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Volume Measurement Accuracy
Sample cells supplied with the colorimeter are marked to indicate
approximately 10 mL or 10, 20, and 25 mL. In most tests where volume
measurements are critical, the procedure specifies the appropriate method.
If a sample must be diluted, use a pipet for volume measurement.
Accuracy is important because a slight mistake in measuring a small
sample will cause a substantial error in the result, For instance, a
0.1-mL mistake in the measurement of a 1.0-mL sample produces a 10%
error in the test result.
Figure 13 Swirling Square Mixing Bottle
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