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in lighter boiling cuts (<100 °C). Appropriate attention to skew (column overloading) and linearity of signal (detector overloading) is advisable if unusual GC results are detected. If using Test Method D 3710, note that results are typically calculated in liquid volume %, not mass % as in the other methods mentioned in X2.2.1. Ensure that correct units are compared (that is, obtain Test Method D 3710 results in mass percent). X2.6.9 Final Calculation:

X2.6.9.1 Calculate the efficiency Arminimum and ECP (°C) at

TABLE X2.3 Relevant Values for Graphical Solution

Note 1—From Chart A for Example 1, an ECP of 200°C is read and for Example 2 an ECP of 300°C. From Chart B for Example 1, the efficiency Nactual = 5.9 and for Example 2 Nactual= 8.4. For Example 1, atmospheric distillation, Nactual = Nmnlmum = 5.9. For Example 2, sub-atmospheric distillation, Nminimum is derived from Eq X2.7, and amounts to 7.2.

Note 1—From Chart A for Example 1, an ECP of 200°C is read and for Example 2 an ECP of 300°C. From Chart B for Example 1, the efficiency Nactual = 5.9 and for Example 2 Nactual= 8.4. For Example 1, atmospheric distillation, Nactual = Nmnlmum = 5.9. For Example 2, sub-atmospheric distillation, Nminimum is derived from Eq X2.7, and amounts to 7.2.

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