Electro-Chemical Devices (ECD) CA6 Hardness Analyzer - Manual (Page 31)

Hazard of chemical burns
This symbol is used to represent the hazard of severe burns and serious injury from
handling dangerous chemicals. All handling and maintenance operations on
chemicals labeled with this symbol should be made by qualified personnel in
accordance with national or local regulations. Qualified Personnel means a person
who has been fully trained and has professional experience to avoid chemical
hazards and dangers. Before handling these chemicals or proceeding with service
operations, read the material safety data sheets supplied with each chemical to take
all the necessary precautions when handling.
Hazard of UV radiation
This symbol is used to represents a hazard from ultraviolet radiation. It is mandatory
to wear eye protection when operating or servicing UV lamps labeled with this
symbol.
Never look directly at a lighted UV lamp. UV radiation exposure can cause severe
and permanent damage to skin and eyes.
Hazard of hot surface
This symbol is used to present a hazard from hot surfaces.
Do not touch the oxidation / digestion module during operation.
Method Description:
After rinsing the hydraulic line, the sample is pumped with the peristaltic pump into the reaction cell.
The oxidation can be performed with:
• the addition of a chemical oxidizer (for example sodium
persulfate or potassium peroxodisulfate) using the Micro
Peristaltic Pump
• the addition of sulfuric acid, using a Micro Peristaltic Pump
• UV irradiation (photochemical)
• heating the cell
The sample and reagents are mixed using the diaphragm pump
until the oxidation cycle is complete.
After the oxidation, the colorimetric reaction is performed to
measure the concentration of the specific parameter present in
the sample.
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