Occasionally labs get request for the measurement of sulfate ions in soils or water samples. Sulfate is generally not considered toxic, however in soils with high sulfate concentrations the sulfate can react with clay mineral causing mechanical swelling of the soil. This effect can severely damage roads and other structures.
Assignment: Find two instrumental (analytical) methods for the analysis of sulfate in water or a water extract of soil. One of the methods should be based on the use of an Atomic Absorption Spectrophotometer. The other method should be based on the use of a UV/Vis spectrophotometer (or colorimeter).
Provide references for both methods. Write a short description of each method, their detection limits and applicable concentration ranges. In your opinion which method would be the easiest to implement with a large number of samples (50 to 100 samples)?
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