Hanna Instruments HI 83212 - Manual (Page 6)

10 11
Pay attention to push the cuvette completely down in the holder.
• In order to avoid reagent leaking and to obtain more accurate measure-
ments, close the cuvette first with the supplied HDPE plastic stopper
and then the black cap.
• Whenever the cuvette is placed into the measurement cell, it must be dry
outside, and free of fingerprints, oil or dirt. Wipe it thoroughly with
HI 731318
or a lint-free cloth prior to insertion.
• Shaking the cuvette can generate bubbles in the sample, causing higher
readings. To obtain accurate measurements, remove such bubbles by
swirling or by gently tapping the cuvette.
• Do not let the reacted sample stand too long after reagent is added, or
accuracy will be lost.
• 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 20°C (68°F). As a general rule of thumb, they
should be doubled at 10°C (50°F) and halved at 30°C (86°F).
REAGENT BLANK CORRECTION
• Some methods require a “reagent blank correction”. The blank and the sample are prepared exactly
in the same way, only the blank is deionized water instead of sample.
A blank cuvette may be used more than once: stability and storing conditions are described for each
method in the related chapter.
INTERFERENCES
• In the method measurement section the most common interferences that may be present in an average
wastewater matrix have been reported. It may be that for a particular treatment process other
compounds do interfere with the method of analysis.
METHOD REFERENCE TABLE
HI83212 - POWER PLANT UTILITIES
Method Method Page
description
1 Ammonia MR 17
2 Ammonia LR 19
3 Free Chlorine 21
4 Total Chlorine 24
5 Copper HR 27
6 Copper LR 29
7 Hydrazine 31
Method Method Page
description
8 Molybdenum 33
9 Phosphate HR 36
10 Phosphate LR 38
11 Phosphorus 40
12 Silica 42
13 Silver 45
HEALTH & SAFETY
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.