HPLC cannot be used to ...? Select one: O a. Determine the mercury content in a fish sample O b. Determine the caffeine content in coffee samples O c. Separate organic pesticides O d. Identify the various pigments from a leaf extract The closeness of agreement between the conventional true value or an accepted reference value and the value found. Select one: O a. Precision O b. Accuracy O c. detection limit O d. Specificity