LaMotte SMART 3 Electronic Soil Lab - Manual (Page 70)

70 SMART3 Soil 1.11
PROCEDURE
Press and hold 1. until colorimeter turns on.
Press 2. ENTER to select TESTING MENU.
Select 3. ALL TESTS (or another sequence containing 056 Manganese HR)
from TESTING MENU.
Scroll to and select
4. 056 Manganese HR from menu.
Fill a clean tube (0290) to the 10 mL line with the soil extract then neutralize 5.
according to the procedure on page 50.
Insert tube into chamber, close lid and select SCAN BLANK.
6.
Remove tube from colorimeter. Use the 0.1 g spoon (0699) to add two 7.
measures of Manganese Buffer Reagent (6310). Cap and mix until powder
dissolves.
Use the 0.15 g spoon (0727) to add one measure of *Manganese Periodate
8.
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.
At the end of the two minute waiting period, mix, insert tube into chamber,
9.
close lid and select SCAN SAMPLE. Multiply the result by 5 to determine the
manganese concentration in ppm.
Press
10. to turn colorimeter off or press
EXIT
to exit to a previous menu
or make another menu selection.
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
Test P
rocedures