LaMotte AST Series Professional Soil Test Outfits - Manual (Page 15)

NEUTRALIZATION OF SOIL FILTRATE
The extract used for the Calcium, Magnesium, Ammonia Nitrogen,
Copper and Iron tests must be neutralized before proceeding with the
test. Neutralization can be accomplished using the following procedure.
QUANTITY CONTENTS CODE
30 mL *Sodium Hydroxide Solution, 15% *7886WT-G
1 pH Hydrion Test papers, 4.5-7.5 2953
*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.
PROCEDURE
Add *Sodium Hydroxide Solution, 15% (7886) to the soil filtrate, one
drop at a time, until the pH test paper (2953) indicates that the pH is
between 6.0 and 7.0.
15