What are the standard tests used to determine the percent of available lime (CaO%) of quicklime and how do they differ?
The two most widely used standard tests for available lime, used in both the private and public sectors, are the ASTM C25 (American Society for Testing and Materials standard) and AWWA B202 (American Water Works Association) tests. Both of these tests use the Rapid Sugar Method with the only significant difference between them being the normality of the acid solution and the sample weight. Both tests require a specified sample weight and specified acid normality such that 1 ml of the volume of acid used equals 1% CaO. This makes it convenient for lab personnel since they can simply read the number of milliliters (ml) of acid used from the burette, which is then equal to the available lime percentage (CaO%). (Lime users and producers may modify the test slightly with regard to the sample size and acid normalities. In those cases the available lime percentage is determined by simple calculations. See Modified Procedures shown below.) Acid Normality and Sample Size: In the case of the AST
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