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Phosphorus, Reactive
5.
Rinse another clean
plastic 125-mL
Erlenmeyer flask and a
25-mL graduated
cylinder with deionized
water.
9.
When the timer
beeps, pour the blank
from the flask into the
Pour-Thru Cell.
Phosphorus, Reactive
Page 2 of 6
6.
Measure 25 mL of
sample in the graduated
cylinder. Pour the water
into the flask (this is the
sample).
Zero
10.
After the flow stops,
touch
.
Zero
The display will show:
3–
0.0 mg/L PO
4
7.
Add 1.0 mL of
Molybdovanadate
Reagent to each flask
using a Repipet Jr.
Dispenser. Swirl to mix.
A yellow color will
develop in the sample if
phosphate is present. A
small amount of yellow
may be present in the
blank due to the reagent.
11.
Pour the prepared
sample from the flask
into the Pour-Thru Cell.
Flush the Pour-Thru Cell
with 50 mL of deionized
water.
PhosphorusReac_PT_High_MOL_Eng_Ody.fm
8.
Touch the timer icon.
Touch
.
OK
A three-minute reaction
period will begin.
If the sample
concentration is greater
3–
than 24 mg/L PO
, read
4
at exactly three minutes or
make a 1:1 dilution of the
sample and begin the test
again.
Read
12.
Touch
.
Read
Results will appear in
3–
mg/L PO
.
4
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