LaMotte HYDROPONICS KIT 3561-01 - Manual (Page 3)

NITRATE NITROGEN
The range of the color standards in the Nitrate Nitrogen Color Bar is from 0.25 to 10
ppm Nitrate Nitrogen. If the nutrient solution is above this range, it should be diluted
to bring the readings within the range. The dilution will depend upon the amount of
nitrate in the solution. A 1 to 20 dilution is suggested.
NOTE: Place dispenser cap (0692) on *Mixed Acid Reagent (V-6278). Save this cap
for refi ll reagents.
1. Fill a test tube (0106) to the 2.5 mL line with nutrient solution.
2. Add *Mixed Acid Reagent (V-6278) to the test tube to fi ll to the 5.0 mL line. Cap
and mix. Wait two minutes.
3. Use the 0.1 g spoon (0699) to add one level measure (avoid any excess) of *Nitrate
Reducing Reagent (V-6279). Cap and invert the tube 50-60 times in one minute.
Wait 10 minutes.
4. Insert Nitrate Octa-Slide 2 Bar (3109-01) into Octa-Slide 2 Viewer (1101).
5. Insert the tube into the Octa-Slide 2 Viewer. Match sample color to a color standard.
If the original sample was diluted, multiply the reading by 20 to obtain the fi nal
result in ppm Nitrate Nitrogen.
PHOSPHORUS
The range of the color standards in the phosphorus comparator is from 3 to 30 ppm
Phosphorus. Most nutrient solutions will have to be diluted to bring the reading within
this range. A 1 to 2 dilution is suggested and involves diluting 5 mL of solution to 10
mL with deionized water.
1. Fill a test tube (0106) to the 5.0 mL line with nutrient sample.
2. Use the 1.0 mL pipet (0354) to add 1.0 mL of *VM Phosphate Reagent (4410).
Cap and mix. Wait 5 minutes.
3. Insert Phosphorous Octa-Slide 2 Bar (5305-01) into Octa-Slide 2 Viewer (1101).
4. Insert test tube into the Octa-Slide 2 Viewer. Match sample color to a color
standard. If the original sample was diluted, multiply the reading by 2 to obtain
the fi nal result in ppm Phosphorus.
POTASSIUM
A turbidimetric method is used for the determination of potassium in the nutrient solution.
It is suggested that the nutrient solution be diluted to a 1 to 5 ratio with deionized
water to bring the sample concentration within the range of the test. A 1 to 5 dilution
involves diluting 2 mL of the sample to 10 mL with deionized water.
1. Remove the square inner tube and collar from the double tube (0780).
2. Fill the round tube to the fi rst line (8 mL) with nutrient sample.
3. Fill to the second line (16 mL total) with deionized water.
4. Add 2 drops of *Sodium Hydroxide Reagent (4259). Cap and mix.
5. Use the 0.5 g spoon (0696) to add one level measure of Tetraphenylboron Powder
(6364). Cap and shake vigorously until all the powder has dissolved. A white
precipitate will form immediately. Wait 5 minutes.