Hach DR/700 Procedures Manual page 237

(0 to 150 µg/L)
LEAD
For drinking water
®
LeadTrak Fast Column Extraction Method
1.
Fill a 100-mL
plastic graduated
cylinder with
100 mL of the water
to be tested. Pour the
measured sample into
a 250-mL plastic
beaker.
Note: The sampling
requirements for "first-
draw" analysis are
detailed in the Sampling
and Storage section.
Note: For proof of
accuracy, use a 50-µg/L
Lead Standard Solution
(preparation given in
Accuracy Check) in
place of the sample.
*U.S. Patent No. 5,019,516
2.
Using a plastic
1-mL dropper, add
1.0 mL of pPb-1 Acid
Preservative Solution
to the sample and
swirl to mix.
Note: If the sample has
been preserved
previously with pPb-1
Acid Preservative at a
rate of 1.0 mL per
100 mL sample, omit
steps 2 and 3.
Note: Samples
preserved with Nitric
Acid require Steps 2
and 3.
48-1
Method 8317
2 minutes
3.
Wait 2 minutes.