LaMotte SMART3 Soil Operator's Manual page 111

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PROCEDURE
A. PREPARATION OF DILUTE ZINC INDICATOR SOLUTION
1. Use a pipet (0352) to add exactly 5.0 mL of *Zinc Indicator Solution (6314) to a 10
mL graduated cylinder (0416). The bottom of the curved surface (the meniscus)
of liquid should be at 5.0 mL mark. Pour this into the bottle labeled *Dilute Zinc
Indicator Solution" (6321-MT-G).
2. Use unrinsed graduated cylinder to add 10.0 mL and then 7.8 mL (total of 17.8 mL)
of *Methyl Alcohol (6319) to bottle labeled *Dilute Zinc Indicator Solution (6321).
Cap and mix ingredients in this bottle. Do not leave this bottle uncapped.
B. DETERMINATION OF ZINC
1. Press and hold until colorimeter turns on.
ENTER
2. Press to select Testing Menu.
3. Select All Tests (or another sequence containing 097 Zinc LR) from Testing
Menu.
4. Scroll to and select 097 Zinc LR from menu.
5. Fill a clean tube (0290) to the 10 mL line with the soil extract then neutralize
according to the procedure on page 84.
6. Insert tube into chamber, close lid and select Scan Blank. (See Note)
7. Remove tube from colorimeter. Use 0.1 g spoon (0699) to add one measure of
Sodium Ascorbate Powder (6316). Use 0.5 g spoon (0698) to add one measure
of *Zinc Buff er Powder (6315). Cap and shake vigorously for 1 minute. Some
undissolved buff er may remain in the bottom of the tube.
8. Add 3 drops of *Sodium Cyanide, 10% (6565). Cap and mix.
9. Use the 1 mL pipet assembly to add 1 mL of *Dilute Zinc Indicator Solution (6321).
Cap and mix.
10. Use a second plain pipet (0352) to add 4 drops of *Formaldehyde Solution, 37%
(5128). Cap and mix by inverting 15 times.
11. Insert tube into chamber, close lid and select Scan Sample. Multiply the result by 5
to determine the zinc concentration in ppm.
12. Press to turn colorimeter off or press
make another menu selection.
NOTE: For best possible results, a reagent blank should be determined to account for
any contribution to the test result by the reagent system. To determine the reagent
blank, follow the above test procedure to scan a distilled or deionized water blank. Then
follow the above procedure to perform the test on a distilled or deionized water sample.
Smart3 Soil Test Procedures 9.18
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ZINC