A Comprehensive Review on Bast Fibre Retting Process for Optimal Performance in Fibre-Reinforced Polymer Composites

Figure 11

Concentration of free calcium dissolved by various chelators under different pH conditions. Symbols: sulfate (♦), nitrilotriacetic acid (◊), EDTA (⌂), carbonate (□), citrate (○), orthophosphate (█), diphosphate (●), and tripolyphosphate (▲) [124].