1. The United States Pharmacopoeia, The National Formulary, XXII, United States Pharmacopoeial Convention, 12601 Twinbrook Parkway, Rockville, MD 20852, 1990, p. 1523.
2. British Pharmacopoeia, 2000, The Stationery Office under license from The Controller of Her Majesty’s Stationery Office, Norwich, England, A174 (Ph. Eur. Meth. 2.4.8).
3. European Pharmacopoeia, third ed. (Suppl.), 2001, Council of Europe, Strasbourg Cedex, France, 2000, Method 2.4.8, pp. 41–42.
4. Japanese Pharmacopoeia, 13th ed., Yakiyi Nippo Ltd., Tokyo, Japan, 1996, pp. 42–43.
5. Removal of Heavy Metals from Automotive Wastewater by Sulfide Precipitation