Milestone Srl MA213-003 – DMA-80 EVO – User Manual
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8.7 CONDITIONING PROCEDURE FOR NEW CATALYST TUBE
8.7.1 Introduction
The following procedure is to be performed after replacing a new catalyst/amalgamator. It is always
enclosed in all catalyst tube package.
Note: before to start the procedure, install properly the catalyst tube. Connect the oxygen/air flow, switch
ON the DMA-80 unit and do not install the amalgamator tube at once, but leave the catalyst free for about
20 minutes to prevent condensation and impurities in the amalgam trap and cells.
After, that connect the amalgamator and be sure the DMA80 unit is ready to operate (alignment of
actuators, stability of Oxygen/air flow). For more details see operator manual.
Step
Reagent/sample
type
Sample
amount
DMA80 analysis method (Initialization)
1
1°-2° B/V amalgamator
-
3°-4°-5°
Blank
(without sample
boat)
1g (indicative
value)
6°
Common white
flour + distilled
H
2
O
300mg+50mg
7°-8°
Blank
(without sample
boat)
1g (indicative
value)
9°
Common white
flour + distilled
H
2
O
300mg+50mg
10°
Blank
(without sample
boat)
1g (indicative
value)
(1)
The analysis method “Initialization” is saved on the USB stick supplied with control terminal or PC
software package
- Replicate the procedure up to get the last blank absorbance < 0.0030 in cell 1 or satisfied for your
working range.
-After conditioning a stability test is required. In a quartz sample boats, repeat 5 times: a fresh aqueous
standard of 100ppb, the RSD must be < 3%.
For this evaluation it is not important the recovery but only the DMA stability so the previous calibration
curve can be used.
- If the stability test is in according to the specs, please proceed making new calibration (see operator
manual) otherwise repeat the conditioning procedure until getting satisfactory results.
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