LaMotte SMART 2 Electronic Soil Lab - Manual (Page 66)

PROCEDURE
1. Press and hold ON button until colorimeter turns on.
2. Press ENTER to start.
3. Press ENTER to select TESTING MENU.
4. Select ALL TESTS (or another sequence containing 56 Manganese H)
from TESTING MENU.
5. Scroll to and select 56 Manganese H from menu.
6. Fill a clean tube (0290) to the 10 mL line with the soil extract then
neutralize according to the procedure on page 50.
7. Insert tube into chamber, close lid and select SCAN BLANK.
8. Remove tube from colorimeter. Use the 0.1 g spoon (0699) to add two
measures of Manganese Buffer Reagent (6310). Cap and mix until powder
dissolves.
9. Use the 0.15 g spoon (0727) to add one measure of *Manganese Periodate
Reagent (6311). Cap and shake for one minute. An undissolved portion of
the reagent may remain in the bottom of the tube without adversely
affecting the test results. Wait two minutes for maximum color
development. Solution will turn pink if manganese is present.
10. At the end of the two minute waiting period, mix, insert tube into chamber,
close lid and select SCAN SAMPLE. Multiply the result by 5 to determine
the manganese concentration in ppm.
11. Press OFF button to turn colorimeter off or press EXIT button to exit to a
previous menu or make another menu selection.
n
MANGANESE CONCENTRATION CHART
PARTS PER MILLION RANGE
0-5 ppm Low
5-12 ppm Medium
13-24 ppm Medium High
25-40 ppm High
Over 40 ppm Very High
66 SMART2 SOIL MANUAL 1.07