Hanna Instruments HI 83218-01 - Manual (Page 10)

10
• Do not let the reacted sample stand too long after reagent is added. For best accuracy, respect the
timings described in each specific method.
• It is possible to take multiple readings in a row, but it is recommended to take a new zero reading for
each sample and to use the same cuvette for zeroing and measurement when possible (for most precise
results follow the measurement procedures carefully).
• Discard the sample immediately after the reading is taken, or the glass might become permanently
stained.
• All the reaction times reported in this manual are at 25 °C (77 °F). In general, the reaction time
should be increased for temperatures lower than 20 °C (68 °F), and decreased for temperatures higher
than 25 °C (77 °F).
INTERFERENCES
• In the method measurement section the most common interferences that may be present in an average
sample matrix have been reported. It may be that for a particular treatment process other compounds
do interfere with the method of analysis.
Method Method Page
description
1 Ammonia HR 16
2 Ammonia MR 18
3 Chromium VI HR 20
4 Chromium VI LR 22
5 Nitrate 24
6 Nitrite HR 26
7 Nitrite LR 28
8 Phosphorus 30
• The chemicals contained in the reagent kits may be hazardous if improperly handled.
• Read the Material Safety Data Sheet (MSDS) before performing tests.
• Safety equipment: Wear suitable eye protection and clothing when required, and follow instructions
carefully.
• Reagent spills: If a reagent spill occurs, wipe up immediately and rinse with plenty of water.
If reagent contacts skin, rinse the affected area thoroughly with water. Avoid breathing released vapors.
• Waste disposal: for proper disposal of reagent kits and reacted samples, refer to the Material Safety
Data Sheet (MSDS).
METHOD REFERENCE TABLE
HEALTH & SAFETY