LaMotte Greenhouse Soil Testing Outfit GS-01 - Manual (Page 8)

pH
QUANTITY CONTENTS CODE
120 mL pH Buffer, 10.00 2896-J
120 mL pH Buffer, 4.01 2866-J
120 mL pH Buffer, 7.00 2881-J
1 Probe Column 0945
1 pH Meter 26094-20C
1 pH Electrode 1904
Read the pH Meter Instruction Manual before proceeding. Standardize
meter before proceeding.
PRO CE DURE
1.
Insert the probe and measure pH.
2. Rinse the electrode and probe with deionized water.
3. Return soil extract to plastic beaker (0944) to use for the remaining
tests.
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NI TRATE NI TRO GEN
QUANTITY CONTENTS CODE
60 mL *Mixed Acid Reagent *V-6278-
H
120 mL *Mixed Acid Reagent *V-6278-J
5 g *Nitrate Reducing Reagent *V-6279-
C
3 Test Tubes, 2.5 & 5 mL, glass 0820
1 Spoon, 0.1 g, plastic 0699
1 Nitrate Nitrogen Comparator 5300
*WARNING: Reagents marked with a * are considered hazardous substances.
Material Safety Data Sheets (MSDS) are supplied for these reagents. For your
safety, read label and accompanying MSDS before proceeding.
NOTE: Place Dispenser Cap (0692) on *Mixed Acid Reagent
(V-6278). Save this cap for refill reagents.
PRO CE DURE
1.
Use a 1 mL pipet (0354) to transfer 1 mL of soil extract to the 25
mL graduated cylinder (0417). Dilute to 25 mL line with deionized
water.
2. Fill a test tube (0820) to the first line (2.5 mL) with diluted soil
extract.
3. Dilute to second line (5 mL) with *Mixed Acid Reagent (V-6278).
Cap and mix. Wait 2 minutes.
4. Use the 0.1 g spoon (0699) to add one level measure (avoid any
excess) of *Nitrate Reducing Powder (V-6279). Cap and invert 50
to 60 times in one minute to mix. Wait 10 minutes. Mix again.
5. Insert test tube into Nitrate Nitrogen Comparator (5300). Match
sample color to a color standard. Record as ppm Nitrate Nitrogen.
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