Milestone Srl MA213-003 – DMA-80 EVO – User Manual
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It is possible to change the limit of absorbance of the cell to increase or decrease the
range of each cell in according with the customer's needs.
Changing the limit of absorbance of the cell (up to their min. and max allowed by the
software), the [ng] scale will change accordingly.
The maximum number of calibration points in a calibration curve allowed by the
software is 99
5.12.3 How to prepare aqueous standard solutions
The Direct Mercury Analyzer can be calibrated using solid Standard Reference Materials or diluted
aqueous standards. Diluted aqueous standards (or working standards) may be prepared by diluting either
1000 ppm or 100 ppm Hg standards (stock solutions).
Solutions must be stabilized with ultrapure HCL 2% v/v.
Both standards are commercially available. Use the equation below to dilute the standards.
Working standard (ppm) = Stock solution (ppm) x (Volume of the stock solution (mL)/Total volume
(mL)*)
* Total volume is the volume of the working standard
Example:
To prepare 1000 µg/Kg(1 ppm) working standard, take 100 µl of the 1000 ppm Stock solution and dilute
up to 100 mL.
To prepare 2000 µg/Kg(2 ppm) working standard, take 200 µl of the 1000 ppm Stock solution and dilute
up to 100 mL.
To prepare 5000 µg/Kg(5 ppm ) working standard, take 500 µl of the 1000 ppm Stock solution and dilute
up to 100 mL.
To prepare 7000 µg/Kg(7 ppm) working standard, take 700 µl of the 1000 ppm Stock solution and dilute
up to 100 mL.
To prepare 10000 µg/Kg(10 ppm) working standard, take 1000 µl of the 1000 ppm Stock solution and
dilute up to 100 mL.
The diluted aqueous standards for low and medium concentration (ppb range) can be prepared from the
1 and 5 ppm solution.
To prepare 5 µg/Kg(5ppb) working standard, take 0.5 mL of the 1 ppm solution and dilute up to 100 mL.
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