23
Arsenometer HMAS100
Instruction Manual v2.0
2.3.5. ADDING A STANDARD ADDITION
When prompted a 20ppb Standard Addition needs to be added to the
SAB. This is achieved by using the pipette (which is set to 280µl). The
20ppb default setting can be changed by pushing the joystick left
and right. Each 140µl increase on the pipette is equivalent to 10ppb.
On the handheld when prompted to add 20ppb of a particular element(s) then the
highlighted value of 20ppb can be altered by pushing the joystick to the left and
to the right. If the user wants to measure higher levels then a higher value closer
to the concentration level will be required. The accuracy will increase the closer
the Standard
Addition is to the actual concentration. For example, an unknown
sample is expected to be around 15ppb then a 20ppb standard in this case is
sufficient. If the user expects the analysis to be 100ppb then, for example, a
120ppb standard would be suitable.
How to use a pipette
1. Place a clean pipette tip on the pipette
2. Select the volume required by twisting the dial at the top of the pipette
3. Hold the pipette with the thumb uppermost and press the
button down gently to the first stop on the top plunger
4. Place the pipette tip in the standard bottle just underneath the top of the liquid
and slowly release the plunger
5. Move the pipette to the SAB and locate the pipette tip through the hole in the
SAB
6. Push the plunger all the way down to the second stop and hold then slowly
withdraw the pipette tip from the SAB
7. To release the pipette tip after use, push the white button at the side of the
pipette
1. 2. 3. 4. 5. 6. 7.
M
x
Std
