| Line 5: | Line 5: | ||
*Store reagents at a consistent temperature between 36F-85F (2C-29C) | *Store reagents at a consistent temperature between 36F-85F (2C-29C) | ||
*Extreme fluctuations cause reagents to deteriorate | *Extreme fluctuations cause reagents to deteriorate | ||
| − | *Keep reagents out | + | *Keep reagents out of prolonged direct sunlight |
*Replace caps immediately after use to limit exposure to air and humidity | *Replace caps immediately after use to limit exposure to air and humidity | ||
*Avoid switching bottle caps | *Avoid switching bottle caps | ||
Revision as of 22:50, 10 November 2019
Water Test Reagents
All water test reagents have a shelf life. Powders and crystals are very stable if kept dry. Acids last long. Storage conditions are more important then date of manufacturer for reagents[1]. Taylor reagents are formulated to last at least one year.
Best Reagent Storage Conditions
- Store reagents at a consistent temperature between 36F-85F (2C-29C)
- Extreme fluctuations cause reagents to deteriorate
- Keep reagents out of prolonged direct sunlight
- Replace caps immediately after use to limit exposure to air and humidity
- Avoid switching bottle caps
- Keep reagent bottle tightly closed[2]
Recognizing Bad Reagents
- R-0002 DPD #2 - should be colorless; as it goes bad it will change to pink then brown[3]
- R-0003 DPD #3 - should be colorless; as it degrades it will become yellow
- R-0004 pH Indicator - as it degrades it turned from red to yellow or purple
- R-0008 TA Indicator - should be dark green; begins to stain the milky bottle as it goes bad
- R-0011L CH Indicator - should be deep blue color; any other color indicates it is bad
- R-0718 Silver Nitrate Indicator - should be colorless; no easy way to tell if bad and recommended to replace annually
- R-0871/R-0872 FAS DPD - Should be colorless; if bad will become increasingly yellow
Other Test Equipment
- Wipe all equipment with a clean dry cloth after use
- Make sure color comparator is in good condition with no fading or staining
- Test vials should be clear and not cracked
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