LaMotte SMART 3 Electronic Soil Lab - Manual (Page 65)

SMART3 Soil 1.11 65
COPPER
DIETHYLDITHIOCARBAMATE METHOD •CODE 3646-SC
QUANTITY CONTENTS CODE
15 mL *Copper 1 *6446-E
*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.
Like many other micronutrients, the amount of available copper varies
considerably with the type of soil. Well drained sandy soils are usually low in
copper while heavily clay-type soils contain an abundant supply of copper. Like
manganese, copper may be unavailable in soils that have a high organic make-
up because it readily forms insoluble complexes with organic compounds.
Generally from 0.2-25 lb/acre of copper is added to the soil to correct a
deficient level. Copper is another metal that is necessary in the formation of the
chlorophyll molecule and like other metals, e.g. iron, manganese and zinc acts
as a catalyst.
RANGE: 0.00-35.00 ppm Copper
METHOD: Cupric ions form a yellow colored chelate with
Diethyldithiocarbamate around pH 9-10, in proportion to
the concentration of copper in the sample.
INTERFERENCES: Bismuth, cobalt, mercury, nickel and silver ions and
chlorine (6 ppm or greater) interfere seriously and must
be absent.
Test P
rocedures