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PHOSPHORUS, REACTIVE,
10.
Insert the
AccuVac Vial
Adapter into the cell
holder.
Table 2. Conversion Factors
To convert reading from
mg/L PO
4
mg/L PO
4
SAMPLING AND STORAGE
Collect sample in plastic or glass bottles that have cleaned with 1:1
Hydrochloric Acid Solution and rinsed with demineralized water. Do
not use commercial detergents containing phosphate for cleaning
glassware used in phosphate analysis.
Most reliable results are obtained when samples are analyzed as soon as
possible after collection. if prompt analysis is impossible, preserve
samples up to 24 hours by storing at or below 4 °C. For longer storage
periods, add 4.0 mL of Mercuric Chloride Solution to each liter of
sample taken and mix. Use of mercuric chloride is discouraged
whenever possible for health and environmental considerations. Sample
refrigeration is still required. Samples preserved with mercuric chloride
must have a sodium chloride level of 50 mg/L or more to prevent
mercury interference. Samples low in chloride should be spiked with
0.1 g sodium chloride per liter of sample.
11.
Place the
prepared sample in
the cell holder.
Note: In bright sunlight
it may be necessary to
close the cell
compartment cover.
To
Multiply by
mg/L P
O
0.747
2
5
mg/L P
0.326
81-52
continued
12.
Press:
READ
The display will
count down to 0.
Then the display will
show the results in
mg/L phosphate
(as PO
).
4
Note: To convert results
to other units, see Table 2.
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