LaMotte POLYPHOSPHATE KIT LOW RANGE COMPARATOR, 0-15 ppm User Manual
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PROCEDURE
1. Fill a tube (0844) to 10 mL line with sample water.
NOTE: If water is not clear, fi lter before testing.
2. Use the plain pipet (0392) to add 10 drops of PPK Reagent C (7344). Cap and
mix thoroughly.
3. Use the 0.5 mL pipet (0369) to add 0.5 mL of *PPK Reagent A (7342). Cap and
mix thoroughly.
4. Use the 1.0 mL pipet (0354) to add 1.0 mL of PPK Reagent B (7343). Cap and
mix thoroughly.
5. Remove cap from test tube. Place tube in Low Range Comparator (1102) with
Polyphosphate Low Range Comparator Bar (7345-01). Fill a test tube (0844) to
the 10 mL line with sample water. Place in Low Range Comparator. match sample
to a color standard. Record as ppm phosphate.
6. 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 2-5 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.