Measuring The Tds Of Soil - LaMotte Tracer 1766 Manual

Conductivity
0 1000
µS
100.9
25.0
°C
NOTE: When measuring samples with low conductivity, thoroughly rinse the
probe with distilled or deionized water before placing it in the sample to
avoid contamination of the sample with electrolyte from the pH reference
electrode. Also increase the sample size to 200 to 500 mL to decrease the
chance of contamination. If a sample cup is used, do not allow the probe to
sit in the sample for any longer than necessary to avoid electrolyte leakage
into the sample. Leakage will raise the conductivity level.

Measuring the TDS of Soil

1. Fill a 50 mL beaker with the soil sample. Tap the beaker lightly on
a hard surface to remove trapped air. Remove excess soil from the
surface.
2. Empty the soil into a 250 mL wide-mouth flask.
3. Add 100 mL of distilled water. Stopper and shake vigorously.
4. Wait 30 minute. (Shake the flask vigorously three or four times
during this period.)
5. Filter the contents of the flask. Collect the filtrate in a beaker.
6. Rinse the electrode with distilled or deionized water to remove
impurities.
7. Press the ON/OFF button to turn the TRACER on. Make sure the
meter is in the TDS mode.
8. Immerse the electrode in the filtrate. Make sure the tip of the
electrode is completely immersed.
9. Stir the filtrate with the electrode to create a homogeneous solution.
10. Gently stir the filtrate with the electrode. Read the TDS value of the
filtrate from the display.
11. Rinse the electrode in distilled water. Replace the cap.
TDS (ppm)
0 1000
ppm
790
25.0
°C
TDS (mgL)
0 1000
mgL
790
25.0
°C
pH
7
2 12
790
pH
L M H
78.6
°F
Salinity
0 1000
ppm S
790
25.0
°C
11