Hanna Instruments C 214, Instruction Manual, Page: 14 / 40

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• Proper use of the powder reagent packet:
(a) use scissors to open the powder packet;
(b) push the edges of the packet to form a spout;
(c) pour out the content of the packet.
USING VIALS
• Never insert hot vials in the instrument, or the cuvet holder may
become damaged.
• In order to avoid reagent leaking and to obtain most accurate
results, it is recommended to close the vial tightly with the supplied
cap after addition of reagents or sample.
• Shaking the vial can generate bubbles in the sample, causing
higher readings. To obtain accurate measurements, remove such
bubbles by swirling or by gently tapping the vial.
• Proper mixing is very important for reproducibility of the
measurements. The right way of mixing a vial is specified for each
parameter in the related chapter.
(a)
invert the vial a couple of times or for a specified time: hold
the vial in the vertical position with the cap up. Turn the vial
upside-down and wait for all of the solution to flow to the cap
end, then return the vial to the upright vertical position and wait
for all of the solution to flow to the vial bottom. This is one
inversion. The right speed of this mixing technic takes 30 seconds
to complete 10 inversions.
This mixing technic is indicated like “invert
to mix”, with the icon:
(
c
) (
a
) (
b
)
invert to mix
67
PHOSPHORUS, REACTIVE HIGH RANGE
SPECIFICATIONS
Range 0.0 to 100.0 mg/L (as PO
4
3- )
Resolution 0.1 mg/L
Precision ±3.0 @ 75.0 mg/L
Typical EMC ±0.1 mg/L
Deviation
Light Source
Tungsten lamp with narrow band interference filter
@ 420 nm
Method
Adaptation of the
Standard Methods for the
Examination of Water and Wastewater, 20 th
edition , 4500-P C, vanadomolybdophosphoric acid
method. The reaction between orthophosphate and
the reagents causes a yellow tint in the sample.
REQUIRED REAGENTS
Code Description Q.ty/test Q.ty/set
* Reagent Vial 1 vial 50 vials
--- Deionized Water 5 mL 1 bottle
* Reagent Vial identification : P , green cap.
Note : Store the unused vials in their container in a cool and dark place.
REAGENT SET
HI 93763A-50 Reagents for up to 49 tests
For other accessories see page 77.
MEASUREMENT PROCEDURE
Before starting to use the reagent kit it is recommended
to read carefully all the instructions and the Health &
Safety Data Sheet (HSDS). Pay particular attention to all
warnings, cautions and notes. Failure to do so may result
in serious injury to the operator.
Reagent Blank Correction : This method needs a reagent blank
correction. A single blank vial may be used more than once; the blank
vial is stable up to two weeks (room temperature). For most accurate
measurement, run a blank for each set of measurements and always use
the same lot of reagents for blank and samples.
Phosphorus, Reactive HR