Used as a reference standard in analytical laboratories for the quantification of dichloroacetic acid in environmental, biological, and water samples. Commonly employed in gas chromatography (GC) and liquid chromatography (LC) methods to calibrate instruments and validate test procedures. Ensures accuracy and reliability in monitoring disinfection by-products in drinking water, especially in compliance with regulatory testing. Also utilized in research studies related to metabolism, where dichloroacetic acid is investigated for its biochemical effects.