Laboratory, Counterlab Rx 2™ (complete), FAS-DPD
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Description of Tests
|Analyte||System||Method/Chemistry||Standard/Equivalance or Description||Comparator||Cell|
|Alkalinity, Total||Drop test||Blended indicator||1 drop = 10 ppm total alkalinity as CaCO₃||NA||9198L|
|Chlorine, Free & Combined||Drop test||FAS-DPD||1 drop = 0.2 or 0.5 ppm chlorine (Cl₂)||NA||9198L|
|Cyanuric Acid||Visual determination||Turbidimetric||30, 40, 50, 60, 70, 80, 90, 100 ppm CYA||4088||NA|
|Hardness, Calcium||Drop test||EDTA titration (includes inhibitors to prevent metal interference)||1 drop = 10 ppm calcium hardness as CaCO₃||NA||9198L|
|pH w/ acid/base demand||Color viewer||Phenol red||7.0, 7.2, 7.4, 7.6, 7.8, 8.0||6125T||NA|
|Calcium, Magnesium, Total Hardness||Metal ions may cause interference; to prevent, add titrant containing EDTA to sample before buffer and indicator, then test as normal making sure to count drops of titrant added initially in total required to reach endpoint. If interference still occurs, dilute sample with DI water as necessary and retest.|
|Chlorine||Chlorine levels > approx. 25 ppm may bleach out indicator or cause sample to develop a brown color; to prevent, add more DPD powder or dilute sample with DI water as necessary and retest. Other halogens and oxidized manganese may cause positive interference.|
|pH||Iron > 10 ppm may cause negative interference.|
|pH||Sanitizer levels > approx. 10 ppm may cause a blue-purple color resulting in false high readings. Wait for sanitizer level to decrease to normal levels and retest to assure an accurate reading.|
|Total Alkalinity||High halogen level may change indicator reaction from green/red to blue/yellow; to prevent, add thiosulfate prior to testing.|
Shelf Life Concerns
REAGENT SHELF LIFE
All reagents have a shelf life, whether they are liquids, powders, crystals, tablets, or test-strip pads. If kept dry, powders and crystals are very stable; acids are also long lived. Date of manufacture is not the controlling factor when it comes to shelf life—storage conditions are more important. As with all perishables, reagents are sensitive to environmental influences and will last longer under controlled conditions.
To this end, we recommend:
- Storing reagents at a consistent temperature in the range if 36°–85°F (2°–29°C); extreme temperature fluctuation, say from a refrigerator to a hot car trunk, causes reagents to deteriorate.
- Keeping them out of prolonged direct sunlight. (Note: their brown plastic bottles help protect very light-sensitive reagents.)
- Segregating reagents from containers of treatment chemicals.
- Replacing caps immediately and tightening them carefully so that exposure to air and humidity is limited.
- Avoiding switching bottle caps, placing bottle caps on soiled surfaces, repouring reagents into contaminated containers, or touching test strip pads.
Taylor formulates its reagents to remain effective for at least one year, with only very few exceptions (molybdenum indicator in liquid form is one; after four months old it should be tested against a standard periodically). As a general precaution, replace all reagents more than one year old, or at the beginning of a new testing season.