Calcium Cocktail Contents ChemicalAmountCost per 5 mL cocktailPer tip Poly(vinyl chloride) 250g$27.80$0.20$0.01 Tetrahydrofuran 1000ml$30.10$0.15$0.01 Calcium ionophore IV 250g$678.90$0.30$0.01 2-Nitrophenyl octyl ether 25ml$120.50$2.41$0.06 Potassium tetrakis(4- chlorophenyl)borate 1.00g$134.00$0.40$0.01