15
Lead in Soil Test Procedure
Extraction Method
(Pb-1P, 0.1mL scoop, and 50mL Plastic Conical tube are not supplied, but required to perform this test)
Add one level scoop (0.1mL volume scoop, which holds approximately 0.14 grams) of soil
sample to a clean 50mL, graduated, plastic conical tube. Add Twenty (20) drops of Pb-1P, Part No.
487925-P15 to the conical tube. Swirl the mixture for a few seconds or until all soil is suspended
and mixed well. After five minutes, bring the volume of the sample to 50mL using deionized,
distilled, or lead free tap water. Cap and mix this solution. This solution is now identified as the
Soil Extraction Solution (SES). Wait one (1) minute, or more, for suspended solids to settle, then
perform the test as follows:
Add 1.0mL (1000 µl) of SES sample to a clean 50mL conical tube. Do not add
Pb-1P, Part No. 487925-
P15 to the conical tube. Adjust the volume of the cell to 50mL using lead free tap water. Mix sample. Test
Sample is ready for testing.
Press the
button to power the meter on; the display will show all annunciators, then the current
MENU selection, followed by the last reading.
Press and re-press the
button until the display shows the parameter
Pb.
Rinse the
CELL at least 3 times with the Test Sample above. Finally, fill cell to capacity with the Test
Sample. Tilt meter forward to allow excess sample to flow out in order to make room for
Pb-2 Reagent
addition below.
Add five (5) drops of
eXact
®
Reagent Pb-2, Part No. 488375-B.
Dip the
eXact
®
Strip Pb-3, Part No. 486997 into the CELL and immediately press
. This starts
the
20 SECOND countdown timer. During this time move the strip in a gentle back and forth motion.
Remove and discard the strip after “1” on the display disappears. The display will flash (- - -) and
begin immediately counting up from
1 to 60. After the 60 seconds, the meter automatically zeros. The
cursor will move across the display followed by 0 µg (µg/L).
Dip the
eXact
®
Strip Pb-4, Part No. 486995 into the CELL and immediately press
. This starts
the
20 SECOND countdown timer. During this time move the strip in a gentle back and forth motion.
Remove and discard the strip after “1” on the display disappears. The display will flash (- - -) and
begin immediately counting up from
1 to 60. After the 60 seconds, the cursor will move across the
display, informing you that it is about to measure the sample as µg (µg/L). Record result displayed (this
result is automatically stored in
Pb). After testing is complete discard sample and rinse cell immediately.
To convert the value in step 7 from µg/L to mg/kg use
17.86 as the multiplication factor:
(For example: 65 µg/L ×
17.86 = 1161 mg/kg)
NOTE: If no Lead is found when 1.0mL SES sample is used in Step 1, then try 2mL of the SES for lower
detection. If the result reads “HI”, then the SES sample should be retested using a 0.01mL sample in
Step 1. Pb-1P and Pb-2 drops required for these SES volume variations are listed in the chart below.
SES
Volume
Pb-1P
Drops
Pb-2
Drops
Multiplication
Factor
Range
(mg/Kg)
Accuracy
%
0.01mL
0
5
1786
up to 300,000
±40
1mL
0
5
17.86
18 to 3000
±25
2mL
0
5
8.93
18 to 1500
±25
Содержание 486900-BT
Страница 1: ...Smart Photometer System ...
