Figure 5.

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Variation of pHf versus pHi for a model oil containing 7 wt% asphaltenes (red triangles) and for the diluted crude oil (black squares), without (solid symbols) and with (open symbols) SDBS. The lines are fits with the model of Reference [17]: pKaA = 5; TAN = 0.43; pKaB = 9; TBN = 1.29 and Xw = 0.95.