Alkalinity is the chemical opposite of acidity. The simple speciation method only works for samples with an initial pH of 9. For example, the change in pH between titrant volumes of 40 and 44 counts or mL is associated with a titrant volume of 42 counts or mL. More about Kevin and links to his professional work can be found at www.
A variety of methods to calculate alkalinity exist. Note that equivalence points are not rigid quantities; they vary with the total content of carbonate DIC in the solution — as shown in this example. Testing has shown that the simple speciation method should work relatively well for most samples with a pH of less than 9.
The Alkalinity Calculator doesn't know the pH of the undiluted sample; it will report only the speciation of the diluted sample, which could be different from that of the undiluted sample.
The alkalinity of the original sample should be equal to:.
The Alkalinity Calculator also is available in a stand-alone version. Actual endpoints are sufficiently variable from sample to sample that the use of a fixed endpoint introduces an unacceptable amount of error in the results. Fields shown in red are required. Join the Alkalinity Calculator mailing list to receive notice of updates and other news! In the end, there's no one answer that fits all situations.
This equality is fulfilled across the whole table. Generally, the answer is "yes.
The bottom row represents the sum in each column. It is the best method available and therefore should be used whenever possible.
Department of the Interior U. Instead of DIC the carbonate system can be specified by the measured alkalinity also known as total alkalinity or M alkalinity. Therefore, you must calculate the speciation on your own, using the equations of the advanced speciation method. Other than accounting for the volume change, the calculation of the sample alkalinity is not affected.