LaMotte SMART3 Soil Operator's Manual page 99

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NITRITE-NITROGEN
DIAZOTIZATION METHOD • CODE 3650-SC
QUANTITY CONTENTS
2 x 60 mL *Mixed Acid Reagent
5 g *Color Developing Reagent
1 Spoon, 0.1 g, plastic
1 Dispenser Cap
*WARNING: Reagents marked with an * are considered to be potential health hazards.
To view or print a Safety Data Sheet (SDS) for these reagents go to www.lamotte.com.
Search for the four digit reagent code number listed on the reagent label, in the
contents list or in the test procedures. Omit any letter that follows or precedes the four
digit code number. For example, if the code is 4450WT-H, search 4450. To obtain a
printed copy, contact LaMotte by email, phone or fax.
Emergency information for all LaMotte reagents is available from Chem-Tel:
(US, 1-800-255-3924) (International, call collect, 813-248-0585).
Nitrites are formed as an intermediate step in the production of nitrate. Soils that are
well drained and aerated contain only small amounts of nitrite nitrogen. Excessive
nitrites, which are toxic to plants, may result from soil conditions unfavorable to the
formation of nitrate, such as inadequate aeration. High nitrite readings may also be
encountered in soils with large amounts of nitrates, where
a portion of the nitrate nitrogen decomposes to form nitrites.
RANGE: 0.00–40.00 lb/acre Nitrite-Nitrogen
METHOD: The compound formed by diazotization of sulfanilamide and
nitrite is coupled with N–(1–naphthyl)–ethylenediamine
to produce a reddish-purple color, which is read
colorimetrically.
INTERFERENCES: There are few known interfering substances at
concentration less than 1000 times the nitrite-nitrogen
concentration; however, the presence of strong oxidants or
reductants may readily aff ect nitrite concentrations. High
alkalinity (above 600 mg/L) will give low results due to a
shift in pH.
Smart3 Soil Test Procedures 9.18
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15
10 20
5 25
0 30
CODE
*V-6278-H
*V-6281-C
0699
0692
NITRITE-NITROGEN
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