LaMotte SMART 3 Electronic Soil Lab - Manual (Page 67)

SMART3 Soil 1.11 67
IRON
BIPYRIDYL METHOD • CODE 3648-SC
QUANTITY CONTENTS CODE
30 mL *Iron Reagent #1 *V-4450-G
5 g *Iron Reagent #2 Powder *V-4451-C
1 Pipet, 0.5 mL, plastic 0353
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.
Iron is essential to the formation of chlorophyll, and iron deficiency causes
chlorosis. While most soils contain abundant iron, only a fraction is soluble
and readily available to the growing plant. This is particularly true in neutral or
alkaline soils. Acid soils contain higher levels of available iron.
RANGE: 0.00-30.00 ppm Iron
METHOD: Ferric iron is reduced to ferrous iron and subsequently
forms a colored complex with bipyridyl for a quantitative
measure of total iron.
INTERFERENCES: Strong oxidizing agents interfere, as well as copper and
cobalt in excess of 5.0 mg/L
Test P
rocedures