LaMotte SMART3 Colorimeter - Manual (Page 271)

SILICA – LOW RANGE
HETEROPOLY BLUE METHOD • CODE 3664-SC
QUANTITY CONTENTS CODE
30 mL *Silica Reagent #1 *V-4466-G
30 mL *Silica Reagent #2 *V-4467-G
30 mL *Silica Reagent #3 *V-4468-G
10 g *Silica Reagent #4 *V-6284-D
1 Spoon, 0.1 g, plastic 0699
*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.
Silicon dioxide, SiO
2
, commonly known as silica, occurs in all natural water. Silica
may be present as suspended, insoluble particles in a colloidal or polymeric state.
It may also be present in a reactive form as silicic acid or silicate ions. Silica is a
major nutrient for diatoms. A silica cycle occurs in many bodies of water containing
organisms, such as diatoms, that use silica in their skeletal structure. The silica
removed from the water may be slowly returned to solution by the decomposition
of the dead organisms. The major source of silica in natural water is from the
decomposition of silicate minerals in the drainage basin from which the waters fl ow.
The presence of silica is particularly objectionable in water used for boiler feed
water purposes, as it may cause the formation of a hard, dense scale which has
unusually high resistance to heat transfer. Serious loss of turbine effi ciency results
from insoluble silica turbine blade deposits caused by vaporization of silica from
boiler water.
SMART3 Test Procedures 11.10 SILICA, Low Range
Test P
rocedures