LaMotte SMART3 Colorimeter - Manual (Page 219)

NITRATE-NITROGEN – LOW RANGE
CADMIUM REDUCTION METHOD • CODE 3649-SC
QUANTITY CONTENTS CODE
2 x 60 mL *Mixed Acid Reagent *V-6278-H
5 g *Nitrate Reducing Reagent *V-6279-C
1 Spoon, 0.1 g, plastic 0699
1 Dispenser Cap 0692
*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.
Nitrogen is essential for plant growth, but the presence of excessive amounts in
water supplies presents a major pollution problem. Nitrogen compounds may enter
water as nitrates or be converted to nitrates from agricultural fertilizers, sewage,
industrial and packing house wastes, drainage from livestock feeding areas,
farm manures and legumes. Nitrates in large amounts can cause “blue babies”
(methemoglobinemia) in infants less than six months of age. Nitrate concentration
is an important factor to be considered in livestock products, where, in addition to
causing methemoglobinemia, it is responsible for many other problems. Nitrates
in conjunction with phosphate stimulate the growth of algae with all of the related
diffi culties associated with excessive algae growth.
U.S. Public Health Service Drinking Water Standards state that 10 ppm nitrate
nitrogen should not be exceeded. To the sanitary and industrial engineer,
concentrations of less than 1 ppm are acceptable.
SMART3 Test Procedures 11.10 NITRATE NITROGEN, Low Range
Test P
rocedures