LaMotte SMART 3 Electronic Soil Lab - Manual (Page 83)

SMART3 Soil 1.11 83
SULFUR
BARIUM CHLORIDE METHOD • CODE 3665-SC
QUANTITY CONTENTS CODE
10 g *Sulfate Reagent *V-6277-D
1 Spoon, 0.1 g, plastic 0699
*WARNING: Reagents marked with an * are considered to be potential health
hazards. To view or print a Material Safety Data Sheet (MSDS) for these reagents
go to www.lamotte.com. To obtain a printed copy, contact LaMotte by e-mail,
phone or fax.
Sulfur is essential to the formation of protein and affects various aspects of
plant metabolism. Sulfur-deficient plants are pale green in color with thin, reedy
stems. Negatively charged sulfate ions are easily leached. The major sources of
soil sulfate are fertilizer containing sulfate compounds and atmospheric sulfur
dioxide carried into the soil by precipitation.
RANGE: 3-94 ppm Sulfur
METHOD: Sulfate ion is precipitated in an acid medium with
barium chloride to form barium sulfate crystals in
proportion to the amount of sulfate present.
INTERFERENCE: Suspended matter and color interference may be
removed by a filtration step. Silica in excess of 500
mg/L will interfere.
Test P
rocedures