Advancement in Photometric Analysis
Apr 07 2008
With the reagent delivery device (eXactÂ® Strip) all the required reagents are impregnated and dried onto filter paper which is then attached to a plastic handle, so reagent handling is minimized. This innovation allows the simultaneous introduction of reagents that must normally be kept segregated. For example, Standard Method 4500-Cl-G, free chlorine testing with Diethyl-p-phenylene diamine sulfate (DPD) uses monobasic and dibasic phosphate buffers. The buffers must be kept separate from the DPD until the test is run. With eXactÂ® Strip the reagents are segregated, stable, and on a single strip called eXactÂ® Strip DPD-1.
For free chlorine the methodology is as follows: Fill the meter cell to capacity (10mL volume) with the water sample. Turn on the meter, and zero. Dip the eXactÂ® Strip DPD-1 in the water sample for 20 seconds with back and forthmotion, then remove the strip and discard. Press the meterâs read button and it will display the free chlorine level with
0.01 mg/L precision.
eXactÂ® Strip technology has new applications in pool/spa, home, aquarium/pond, food processing and dialysis water testing. Additional applications include automotive coolant and lead paint testing. The eXactÂ® EZ Advanced Photometric System offers more than 25 different parameters for analysis. For more information, please visit us online.
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