LaMotte SMART 2 Electronic Soil Lab - Manual (Page 81)

ZINC
ZINCON METHOD CODE 3667-SC
QUANTITY CONTENTS CODE
30 mL *Zinc Indicator Solution *6314-G
120 mL *Methyl Alcohol *6319-J
10 g Sodium Ascorbate 6316-D
25 g *Zinc Buffer Powder *6315-G
15 mL *Sodium Cyanide, 10% *6565-E
30 mL *Formaldehyde Solution, 37% *5128-G
1 “Diluted Zinc Indicator Solution” Bottle,
w/1 mL pipet assembly 0128-MT
1 Graduated Cylinder, 10 mL, glass 0416
1 Spoon, 0.5 g 0698
2 Pipets, plain, plastic 0352
1 Spoon, 0.1 g 0699
*WARNING: Reagents marked with a * are considered to be potential health hazards. To view
or print a Material Safety Data Sheet (MSDS) for these reagents see MSDS CD or
www.lamotte.com. To obtain a printed copy, contact LaMotte by e-mail, phone or fax.
The availability of zinc in soils decreases with an increase in soil pH. Some
soils that are limited above pH 6.0 may show a zinc deficiency especially in
well drained sandy soils. A nutrient interaction exists between soils that have a
high phosphorous level and show a zinc deficiency even though zinc levels
were sufficient. This interaction is due to the preferential uptake of phosphorus
instead of zinc and the possible formation of insoluble zinc phosphates. Once
zinc is applied to the soil, it is relatively immobile because it is readily absorbed
by organic matter in the soil.
Zinc is essential in promoting certain enzyme reactions in the soil and is
required for the production of chlorophyll and the formation of carbohydrates
in plants.
APPLICATION: Drinking and surface waters, domestic and industrial
waste water.
RANGE: 0.00 - 15.00 ppm Zinc
METHOD: Zinc forms a blue colored complex with Zincon in a
solution buffered at pH 9.0. Other heavy metals are
complexed by cyanide and the zinc cyanide complex
is released by the addition of formaldehyde before the
other metal cyanide complexes are destroyed. Sodium
ascorbate is added to reduce the interference of
manganese.
SMART2 SOIL MANUAL 1.07 81