Milestone Srl MA213-003 – DMA-80 EVO – User Manual
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8.3.2 Cleaning methods
Different cleaning methods are recommended in according with the purpose. The below method are
saved on the USB stick of the control terminal or PC software package.
Boat Holder cleaning: to be used after organic samples if there is
carry over effects by accumulation of sample residues on the
ceramic plug of the boat holder (run this method without boats on
autosampler plate)
Clean procedure: to be used for cleaning boats (the boats should
be empty without any residue of previous sample inside. If present,
remove it with a spatula)
Clean water: to be used for safe cleaning of whole instrument and
all its components. (0,3ml of distilled water for boat)
Initialization: to be used for catalyst tube conditioning or
reactivation. But even in case of very high contamination of system.
(300mg of flour + 0,05ml of distilled water for boat)
Blind Value (BV): to be used for fast cleaning of the instrument,
directly from “State” column of measure page. (run this method
without boats on autosampler plate)
8.3.3 Tips for a good cleaning
- Boats can also be cleaned in muffle oven (900°C for 10’ for quartz boats, 600°C for 10’ for metal boats)
- Before sample measurement is better to use first Clean water method and then Clean procedure
method just for checking the value of instrumental blank
- If we just want to clean the device between samples, use Clean water method if the samples have
medium or high Hg concentration. Clean procedure method could be enough for samples with low Hg
concentration.
- The use of HCL 2% v/v for cleaning should be limited to cases with carry over effects or whenever the
required instrumental blank value is not achieved with the other methods or in case of acidified samples
Here below are reported the most common reasons of high blanks
Contamination of sample boat holder by organic
samples.
With the help of a sand paper remove the film
accumulated on the ceramic head of the sample
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