LaMotte AM-41 Hydroponics Test Kit - Manual (Page 8)

5. Use the 0.05 g spoon (0696) to add one level measure of
*Tetraphenylboron Powder (6364). Cap and shake vigorously for 30
seconds until all the powder has dissolved. A white precipitate will
form immediately. Allow the tube to stand for 5 minutes.
6. Shake the tube again. Remove cap and slowly insert the square tube
with the collar. The square tube will slide up and down through the
collar and will fill with liquid.
Viewing from above, adjust the square tube into the turbid solution
until the black dot on its base just disappears. Hold the round tube at
the top to avoid blocking light.
7. Read result where liquid meets scale. Record as ppm Potassium. If
sample was diluted, multiply by 5. Record as ppm Potassium.
NOTE:
Brush tubes thoroughly after each use.
AMMONIA NITROGEN
The Ammonia Nitrogen Comparator measures levels from 1 to 8 ppm.
Most nutrient solutions will have to be diluted to bring them into this
range. A 1 to 20 dilution is suggested (see Page 6).
1.
Fill test tube (0230) to 5 mL line with sample.
2. Add 4 drops of Ammonia Nitrogen Reagent #1 (4797WT). Cap and
mix.
3. Add 8 drops of *Ammonia Nitrogen Reagent #2 (4798WT). Cap and
mix.
4. Insert test tube into the Ammonia Nitrogen Comparator (4796).
Match sample color to a color standard. Record as ppm Ammonia
Nitrogen.
If sample was diluted, multiply by 20. Record as ppm Ammonia
Nitrogen.
SULFATE
The Sulfate Comparator measures levels from 0 to 200 ppm. Most nutrient
solutions will have to be diluted to bring them into this range (see Page 6).
1.
Fill test tube (0822) to line with sample.
2. Add one *Sulfate Turb Tablet (6456). Cap and shake vigorously for at
least one minute to dissolve the tablet.
8