Hanna Instruments HI 38061 - Manual (Page 2)

The chemicals contained in this kit may be hazardous if
improperly handled. Read the relevant Health and Safety
Data Sheet before performing this test.
HEALTH AND SAFETY HEALTH AND SAFETY HEALTH AND SAFETY HEALTH AND SAFETY HEALTH AND SAFETY
REFERENCES REFERENCES REFERENCES REFERENCES REFERENCES
APHA, AWWA, WEF, Standard Methods for the Examina-
tion of Water and Wastewater
, 18 th edition, 1992
13- Wait for 3 minutes to allow reaction to occur.
14- Remove the cap and insert the reacted sample into the
right hand opening of the checker disc.
15- Hold the checker disc so that a
light source illuminates the
samples from the back of the
windows.
16- Keep the checker disc at a distance of 30-40 cm (12-
16") from the eyes to match the color. Rotate the disc
while looking at the color test windows and stop when
you find the color match.
17- Read the value in the result window, divide it by 10
and record it in mg/L (or ppm) of Phosphate. To convert
this result to mg/L (ppm) of Phosphorus, divide it by
3.1.
0-50 ppm Phosphate (PO
4
3- ) Range:
18- Remove the mirror, if in-
stalled, and insert just the
38073 disc as shown in
the figure.
19- Using the 3 mL pipette, add to one of
the glass vials 5 mL of sample (up to
the mark) and insert the vial into the
left hand opening of the checker disc.
This is the blank.
20- Using the syringe, add to the other vial 0.75 mL of
sample.
Note: To measure exactly 0.75 mL of sample with the
syringe, push the plunger completely into the syringe
and insert the tip into sample. Pull the plunger out
until the lower edge of the seal is on 0.0 mL mark of
the syringe. Insert the syringe into the vial and push
the sample out until the lower edge of the seal is on
the 0.75 mL mark (the longer mark between 0.7
and 0.8).
5 mL
21- Use the long
plastic pipette
to add deion-
ized water up
to the 7.5 mL
mark, replace
the cap and
swirl to mix.
22- Remove the cap
and add 1 packet
of HI 93713-0
Reagent. Replace
the cap and
shake vigorously
for 20 seconds. This is the reacted sample.
23- Follow the instructions from step 13 to 16.
24- Read the value in the result window directly in mg/L
(or ppm) of Phosphate. To convert this value to mg/L
(ppm) of Phosphorus, divide it by 3.1.
For best results: Perform the reading three times and take
the average value (divide by 3 the sum of the three
numbers). Intensely colored samples will make the color
matching determination difficult and they should be
adequately treated before performing the test. Sus-
pended matter in large amounts should be removed by
prior filtration.
Caution: Ultraviolet radiation may cause fading of colors.
When not in use, keep the disc protected from light,
in a cool and dry place.
Interferences: iron above 5 ppm; copper above 10 ppm;
hydrogen sulfide, arsenate and highly buffered
samples.
7.5 mL