Methods; Cod Reagents; Preparing The Sample; Measurement - Orbeco SC450 Manual Del Usuario

Methods

COD Reagents

Select the appropriate vial for the desired range*:
LR-Range: 0 – 150 mg/l, part number TT20720, 25 count
MR-Range: 0 – 1500 mg/l, part number TT20721, 25 count
HR-Range: 0 – 15000 mg/l, part number TT20722, 25 count
*Reagents are also availble in 150 count packages. Contact customer service for ordering information, as well as
mercury-free options.

Preparing the Sample

Open a reaction vial with a white cap and add the specified volume.
(Ensure that appropriate personnel safety equipment is used.)
LR-/MR: 2 ml water sample
HR: 0.2 ml water sample
Prepare a blank (Note 1) by using deionized water (TOC-free) instead of the sample
(LR/MR: 2 ml, HR: 0.2 ml).
Replace the cap tightly. Invert the vial gently several times to mix the contents (The vial
will become hot during mixing!) and digest the vials for 120 minutes in the reactor at a
temperature of 150 °C.
Remove the vials from the reactor and allow them to cool down to 60°C or less. Mix the
contents by inverting each vial several times while still warm. Then allow the vials to cool to
ambient temperature before measuring.
On
Off
RANGE
Mode
RANGE
Zero
Test
RA NGE
6

Measurement

Fix the adapter for 16 mm vials on the sample chamber.
Turn the unit on using the [ON/OFF] key.
The display shows the following:
Select the required test using the [MODE] key.
Scroll Memory (SM)
To avoid unnecessary scrolling for the required test range, the instru-
ment memorizes the last range used before being turned off. When
the instrument is turned on again, the scroll list comes up with the
last used test range.
The display shows the following:
Place the blank in the adapter (Note 1 – 4) making sure that the
marks are aligned.
Blanks are specially prepared for each individual test range.
Press the [ZERO/TEST] key.
The "Range" symbol flashes for approx. 8 seconds.
SC450_V1_12/2010