Fig. 1From: Production of biodiesel from coastal macroalgae (Chara vulgaris) and optimization of process parameters using Box-Behnken designResponse surface plot for all design condition. a Effects of temperature and NaCl on calorific value at constant chloroform (ml), b Effects of temperature and chloroform on calorific value at constant sodium chloride concentrations, and c Effects of chloroform and NaCl concentrations on calorific value at constant temperature (°C)Back to article page