Lamotte SMART3 Colorimeter User Manual download pdf (Page 225)

NITROGEN, TOTAL

CHROMOTROPIC ACID WITH PERSULFATE

DIGESTION METHOD • CODE 4026-01

QUANTITY CONTENTS CODE

25 Total Nitrogen Hydroxide Reagent Tubes 4040-G

5 g *Digestion Reagent Powder *4036-C

60 mL Deionized Water *5115PS-H

5 g *Total Nitrogen Reagent A Powder *4041-C

30 *Total Nitrogen Reagent B Tablets *4042A-G

25 *Total Nitrogen Acid Reagent Tubes *4043-G

2 Spoon, 0.15 g, plastic 0727

4 Pipets, 1.0 mL, plastic 0354

2 Funnels, plastic 0459

*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.

Note: for greater accuracy, use laboratory grade pipets.

Equipment needed but not supplied:

1 COD Adapter 5-0087

1 COD Reactor, 12 tube, 110V 5-0102

or 1 COD Reactor, 12 tube, 230V 5-0102-EX2

1 Measuring Pipet, 1.0 mL 2-2110

1 Pipet Bulb 2-2164

1 Wipes 2-2069

1 Test Tube Holder 2-2190

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

SMART3 Test Procedures 2.11 NITROGEN, Total

Test Procedures

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Lamotte SMART3 Colorimeter User Manual Page 225