Phosphate Buffered Saline, pH 7.2 is recommended for preparation of dilutions and blanks for the examination of water, dairy products, foods, utensils and other specimens. This solution gives a pH of 7.2.
1.Clesseri, Greedberg and Eatton (ed). 1988.Standard methods for the examination of water and wastewater, 20th ed. AmericanPublic Health Association, Washington, D.C.