Phosphorus, Reactive
Phosphorus, Reactive
Page 2 of 6
PhosphorusReac_PT_High_MOL_Eng_Ody.fm
5. Rinse another clean
plastic 125-mL
Erlenmeyer flask and a
25-mL graduated
cylinder with deionized
water.
6. Measure 25 mL of
sample in the graduated
cylinder. Pour the water
into the flask (this is the
sample).
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.
8. Touch the timer icon.
Touch
OK.
A three-minute reaction
period will begin.
If the sample
concentration is greater
than 24 mg/L PO
4
3–
, read
at exactly three minutes or
make a 1:1 dilution of the
sample and begin the test
again.
9. When the timer
beeps, pour the blank
from the flask into the
Pour-Thru Cell.
10. After the flow stops,
touch
Zero.
The display will show:
0.0 mg/L PO
4
3–
11. Pour the prepared
sample from the flask
into the Pour-Thru Cell.
Flush the Pour-Thru Cell
with 50 mL of deionized
water.
12. Touch Read.
Results will appear in
mg/L PO
4
3–
.
Zero Read
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