6
Lead in Water Recommendation for “First Draw Sample”
Ready Snap
®
Procedure
The eXact
®
LEADQuick with Bluetooth
®
SMART is designed to work with our line of eXact
®
Micro Strips.
This type of reagent delivery method is designed to give the most precise accuracy reading for testing
various water quality parameters.
eXact
®
Strip Micro has been designed to offer the user a more “Green” and cost–effective alternative
to testing. Instead of using a 10mL water sample, eXact
®
Strip Micro uses a 4mL water sample,
which uses up to 60% less chemical per test. The accuracy of the meter is maintained by designing
the photo cell with a 20 mm path–length.
About
e act
Strip
e act
e act
Strip
Strip
The EPA 2007 Lead and Copper Rule Revision has a heavy lead testing focus on schools. The sampling
is tiered:
1. “First draw sample” - sample a line unused for at least 8 to 18 hours. Draw the first 250mL to test. This
measures the lead contribution from fixtures.
2. “Flushed sample” - before any water is used in the morning allow the line to run for 30 seconds, and
then collect a 250mL sample. This measures the lead contribution from internal piping.
The June 1991 Lead and Copper Rule Fact Sheet recommended 1 liter of water from a tap unused for 6
hours. This is not mentioned in the 2007 revisions to the rule.
The amount of flushing determines what part of the system is being evaluated for lead. If the volume of
water in the system can be determined (e.g. gallons of water/linear ft. of pipe) the amount of flushing can
help isolate the source of the lead contamination. It appears that this approach is used by some cities as
they do mandated lead testing of their water systems.
When there is a question about the quality of a ReagentStrip
™
, your test method, or the photometer you
are using, then it is recommended to test the SYSTEM (reagent, you, and photometer) by using the
appropriate READY SNAP
™
solution.
Follow the procedure below for the test you are running. If you get the acceptible result using the READY
SNAP
™
solution, then you can be confident that the reagent, you, and the photometer are working as a
SYSTEM correctly.
1
Snap off top of ReadySnap
™
1 vial safely and add one (1) drop of Acid-1 (486999) to Solution in
ampoule.
2
Mix Solution by sucking up liquid with plastic pipette.
3
Turn on eXact
®
LEADQuick
™
meter
and scroll to PB MENU.
4
Using pipette, fill meter CELL with Solution and then empty cell.
5
Fill meter
CELL again with Solution and tilt meter forward to make room for Pb-2 Reagent.
6
Add five drops of
Pb-2 Reagent (488375-B).
7
Dip Pb-3 Strip (486997) into cell and immediately push READ. Move strip
in a gentle, back and forth motion (approx. 2 strokes/Sec) for 20 seconds. Remove strip after “1” on the
display disappears.
8
Display will flash and automatically start to count up from 1 to 60. After the 60
seconds, meter automatically zeros.
9
Dip Pb-4 Strip (486995) into cell and immediately press READ.
Move strip in a gentle, back and forth motion (approx. 2 strokes/Sec) for 20 seconds. Remove strip after
“1” on the display disappears.
10
Display will flash and automatically count up from 1 to 60. After the 60
seconds, the cursor will move across display while the meter prepares to measure the sample. Record
results displayed (this result is automatically stored in PB Menu).
11
After testing is completed, rinse
CELL at least three times.
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