EPA Method 9036

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EPA Method 9036:

The sample is first passed through a sodium-form cation-exchange column to remove multivalent metal ions. The sample containing sulfate is then reacted with an alcohol solution of barium chloride and methylthymol blue (MTB) at a pH of 2.5-3.0 to form barium sulfate. The combined solution is raised to a pH of 12.5-13.0 so that excess barium reacts with MTB. The uncomplexed MTB color is gray; if it is all chelated with barium, the color is blue. Initially, the barium and MTB are equimolar and equivalent to 30 mg SO4 /liter; thus the -2 amount of uncomplexed MTB is equal to the sulfate present.

This automated method is applicable to ground water, drinking and surface waters, and domestic and industrial wastes.

Report Number:
SW-846 Ch 5