LaMotte STH Outfit - Manual (Page 15)

15
Chloride
Chlorides are present in practically all soils. Application of fertilizer
may increase chloride levels. Chlorides are removed from the soil
by leaching. Excessive concentrations are toxic to plants. A high test
reading, particularly where stunted growth has been observed, may
indicate poisoning due to high chloride levels in the soil.
PROCEDURE
1. Use the Demineralizer Bottle (1155) to fi ll a tube (0970-S) to the 5
mL line with demineralized water.
2. Use the 0.5 g spoon (0698) to add four level measures of the soil
sample to the tube. Cap and shake vigorously for 2-3 minutes.
3. Use a piece of fi lter paper (0465) and a plastic funnel (0459) to fi lter
the mixture into a second tube (0970-S). (Fold fi lter paper in half
and then in half again to form a cone which is fi tted into the funnel.)
4. Use a transfer pipet (0364) to transfer fi ve drops of the fi ltrate in the
second tube to a fl at-bottomed turbidity vial (0242).
5. Add one drop of *Chloride Test Solution (5111) to the vial. Swirl
gently to mix.
6. Match the turbidity or amount of precipitation against the turbidity
standards on the Chloride Chart (1304). Lay the chart fl at under
natural light and hold the turbidity vial one-half inch above the black
strip in the middle of the chart. View the black strip down through
the turbid sample and compare the resulting shade of gray with the
six standard shades. The test result is read in parts per million chloride.