EXPLANATION
This method can measure between 0.55 and 20 mg/kg of total inorganic sulfate, 4.0 to 20 mg/kg of potential inorganic sulfate, and 0.75 to 50 mg/kg of total inorganic chloride.
TEST SUMMARY
For total inorganic sulfate and chloride, a small volume of a sample is evaporated to dryness and reconstituted to the initial sample volume with deionized water, and injected into an ion chromatograph consisting of appropriate ion exchange columns, suppressor and a conductivity detector. For potential sulfate, the dried residue is reconstituted with 0.90% hydrogen peroxide solution in water, and injected into an ion chromatograph.
Similar methods for chloride and sulfate determinations can be found in Test Method ASTM D5827 for engine coolant and for ethanol in ISO/CEN 15492.
TEST PRECISION
where X is the average of two determinations.
Since no generally accepted reference materials are available for this analysis, no statement regarding the bias of this test method can be made.