L mott, Lamotte com pany – LaMotte POLYPHOSPHATE TEST KIT PPK-R User Manual
Page 2
make-up water for which the blank test factor has already been
determined.
USE OF THE OCTET COM PARA TOR
The Octet Comparator contains eight permanent
color standards. A test sample is inserted into the
openings in the top of the comparator. The sample
can then be compared to four color standards at once,
and the value read off the comparator. For optimum
color comparison, the comparator should be
positioned between the operator and a light source,
so that the light enters through the special
light-diffusing screen in the back of the comparator.
Avoid viewing the comparator against direct sunlight
or an irregularly lighted background.
PRO CE DURE
1.
Fill three test tubes (0844) to 10 mL line with sample water.
NOTE:
If water is not clear, filter before testing.
2.
Insert two test tubes into the Axial Reader (2070) as blanks.
3.
Use the plain pipet (0392) to add 10 drops of PPK Reagent C (7344)
to the third test tube. Cap and mix thoroughly.
4.
Use the 0.5 mL pipet (0369) to add 0.5 mL of *PPK Reagent A
(7342). Cap and mix thoroughly.
5.
Use the 1.0 mL pipet (0354) to add 1.0 mL of PPK Reagent B (7343).
Cap and mix thoroughly.
6.
Remove cap. Insert test tube into the Axial Reader. Match sample
color to a color standard. Record as ppm phosphate.
7.
If the test result is higher than the 15 ppm color standard, repeat the
test on a diluted sample:
A. Fill the three test tubes to either the 2.5 mL or the 5.0 mL line
with sample water.
B. Dilute all three tubes to 10 mL line with demineralized or
polyphosphate-free water.
C. Proceed with Steps 2-6 above.
D. If a 2.5 mL sample size was used, multiply the comparator reading
by a factor of 4 to obtain the test result in ppm PO
4
. If a 5.0 mL
sample size was used, multiply the comparator reading by a factor
of 2.
LaMOTTE COM PANY
Helping Peo ple Solve An a lyt i cal Chal lenges
®
PO Box 329 • Chestertown • Mary land • 21620 • USA
800-344-3100 • 410-778-3100 (Out side U.S.A.) • Fax 410-778-6394
Visit us on the web at www.lamotte.com
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L Mott