Milestone DMA-80 evo - Reference Page

Milestone Srl MA213-003 – DMA-80 EVO – User Manual
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To prepare 10 µg/Kg(10ppb) working standard, take 1 mL of the 1 ppm solution and dilute up to 100 mL.
To prepare 20 µg/Kg(20ppb) working standard, take 2 mL of the 1 ppm solution and dilute up to 100 mL.
To prepare 30 µg/Kg(30ppb) working standard, take 3 mL of the 1 ppm solution and dilute up to 100 mL.
To prepare 50 µg/Kg(50 ppb) working standard, take 1 mL of the 5 ppm solution and dilute up to 100 mL.
To prepare 100µg/Kg(100ppb) working standard, take 2mL of the 5ppm solution and dilute up to 100 mL.
To prepare 200µg/Kg (200ppb) working standard, take 4mL of the 5ppm solution and dilute up to 100mL.
To prepare 500µg/Kg(150ppb) working standard, take 5mL of the 10ppm solution and dilute up to 100
mL.
There are three standard different working range responses that the instrument may be calibrated on:
- The low range is 0- 10 ng Hg
- The medium range is 10-20 ng Hg
- The high range is 20-1000 ng Hg.
Make sure the stock standard is not old or contaminated. As soon as the working standards are prepared,
transfer them into brown glass bottles. Aqueous standards with low Hg concentration are very unstable
when stored in plastic or regular clear bottles. Do not expose the Hg standards to the air . Mix the
aqueous samples each time prior to the analysis. As soon as the sample is pipetted out, close the storage
container. Don’t leave the solution bottles open on the bench and at the end store them into a fridge at 5-
10°C
5.12.4 Reference page
Reference measurements are saved in these page. The file are stored in the disk with the format “.r80”
and the table with information on each measurement can be printed and serves as QC for the unit.
A Reference sample is used to check the validity of the calibration curve. Measuring this sample will
calculate a calibration factor for correction of the curve. This factor is displayed in a separate column of
the “Results” of “Data” screen. The standard calibration factor is “1.0000”.