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Factor & Method: Phosphonate: Thorium titration using xylenol orange indicator (testing Dequest) or chrome azurol S indicator (testing Bayhibit or Dequest). The xylenol orange method uses a fluoride inhibitor. All kits list equivalences for various phosphonates
Test system: XO direct reading titrator
Range/Sensitivity: 0 to 20 ppm/0.4 ppm NaAMP, 50 at 20 ppm
# of Tests (# of reagent): (5)