LaMotte SMART Spectro Spectrophotometer - Manual (Page 214)

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 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.
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 flow.
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 efficiency
results from insoluble silica turbine blade deposits caused by vaporization of
silica from boiler water.
SMART SPECTRO TEST PROCEDURES 05.04 Silica–LR 1/3