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Parameter
Vial letter
Vial cap color
HI 93764A Ammonia LR
A
white
HI 93764B Ammonia HR
A
green
HI 93701
Chlorine, Free
(no letter)
white
HI 93711
Chlorine, Total
(no letter)
white
HI 93766
Nitrate
N
white
HI 93767A Nitrogen, Total LR
N
green (digestion vial)
white (reagent vial)
HI 93767B Nitrogen, Total HR
N
red (digestion vial)
white (reagent vial)
HI 93754A Oxygen Demand,
(no letter)
red
Chemical (COD) LR
HI 93754B Oxygen Demand,
(no letter)
white
Chemical (COD) MR
HI 93754C Oxygen Demand,
(no letter)
green
Chemical (COD) HR
HI 93758A Phosphorus, Reactive
P
red
HI 93758B Phosphorus,
P
white
Acid Hydrolyzable
HI 93758C Phosphorus, Total
P
white
HI 93763A Phosphorus, Reactive HR
P
green
HI 93763B Phosphorus, Total HR
P
white
• The letter refers to:
A
: ammonia
N
: nitrate; total nitrogen
P
: phosphorus
(no letter)
: chemical oxygen demand (COD) and generic empty
vials.
• The cap color allows distinguishing different vials that are used to
measure the same analyte (indicated by the letter code), but for a
different range, or between different vials used in a single
measurement procedure.
Note that different parameters use sometimes the same vials (thus with
the same letter and
and
and
and
and same cap color).
63
PHOSPHORUS, TOTAL
SPECIFICATIONS
Range
0.00 to 3.50 mg/L (as PO
4
3-
)
Resolution
0.01 mg/L
Precision
±0.06 @ 2.50 mg/L
Typical EMC
±0.01 mg/L
Deviation
Light Source
Tungsten lamp with narrow band interference filter
@ 610 nm
Method
Adaptation of the EPA method 365.2 and
Standard
Methods for the Examination of Water and
Wastewater, 20
th
edition
, 4500-P E, ascorbic acid
method. A persulfate digestion converts organic
and condensed inorganic forms of phosphates to
orthophosphate. Then the reaction between
orthophosphate and the reagents causes a blue
tint in the sample.
REQUIRED REAGENTS
Code
Description
Q.ty/test
Q.ty/set
*
Reagent Vial
1 vial
50 vials
---
Potassium Persulfate
1 packet
50 packets
---
NaOH Solution 1.54 N
2 mL
1 bottle
HI 93758-0
Phosphorus Reagent
1 packet
50 packets
*
Reagent Vial identification
:
P
,
white
cap.
Note
: Store the unused vials in their container in a cool and dark place.
REAGENT SET
HI 93758C-50
Reagents for 50 tests
For other accessories see page 77.
REQUIRED ACCESSORIES
C 9800-01
Hanna reactor (115 VAC)
C 9800-02
Hanna reactor (230 VAC)
HI 740216
test tube cooling rack (25 holes)
HI 740217
Laboratory bench safety shield
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.
Phosphorus, Total