eutech-instruments bromide epoxy Manuale Utente
Instruction Manual
Bromide Electrode
8
2.
Place the more dilute solution on the magnetic stirrer and begin stirring at a constant rate.
Assure that the meter is in the concentration mode. Lower the electrode tips into the
solution.
Assure that the meter is in the concentration mode. Lower the electrode tips into the
solution.
3.
Adjust the meter to the concentration of the standard and fix the value in the memory
according to the meter manufacturer's instructions after stabilization of the reading.
according to the meter manufacturer's instructions after stabilization of the reading.
4.
Rinse the electrodes with distilled water and blot dry.
5.
Place the more concentrated solution on the magnetic stirrer and begin stirring at a
constant rate. Lower the electrode tips into the solution.
constant rate. Lower the electrode tips into the solution.
6.
Adjust the meter to the concentration of the standard and fix the value in the memory
according to the meter manufacturer's instructions after stabilization of the reading.
according to the meter manufacturer's instructions after stabilization of the reading.
7.
For low level bromide measurements, place the rinsed, dried electrodes into a solution
containing 100 ml of distilled water and 2 ml of ISA. After stabilization, fix the blank
value into the meter according to the meter manufacturer's instructions.
containing 100 ml of distilled water and 2 ml of ISA. After stabilization, fix the blank
value into the meter according to the meter manufacturer's instructions.
8.
Place 100 ml of the sample and 2 ml of ISA in a 150 ml beaker, place it on the magnetic
stirrer, an d begin stirring.
stirrer, an d begin stirring.
9.
Immerse the electrode tips in the solution and wait for the reading to stabilize. Read the
concentration directly from the meter display.
concentration directly from the meter display.
10. The calibration should be checked every two hours. Assuming no change in ambient
temperature, place the electrode tips in the first bromide standard. After the reading has
stabilized, compare it to the original reading in Step 3 above. A reading differing by more
than 0.5 mV or a change in the ambient temperature will necessitate the repetition of steps
2-6 above. The meter should be re-calibrated daily.
stabilized, compare it to the original reading in Step 3 above. A reading differing by more
than 0.5 mV or a change in the ambient temperature will necessitate the repetition of steps
2-6 above. The meter should be re-calibrated daily.
Low Level Bromide Determinations (using a pH/mV meter)
This procedure is recommended for solutions containing less than 2.0X10
-6
M (0.2 ppm). Use the
following low level bromide measurement procedure in the non-linear portion of the calibration
curve. (See Figure 1.)
curve. (See Figure 1.)
1.
Using 20 ml of the standard ISA, dilute to 100 ml with distilled water. This low level
(1.0M NaNO
(1.0M NaNO
3
) is added at the rate of 1 ml low level ISA to each 100 ml of sample. The
background ionic strength will be 1.0X10
-2
M.
2.
Dilute 1 ml of 0.1M standard to 1,000 ml to prepare a 1.0X10
-4
M standard solution for
measurements in moles per liter. Dilute 10 ml of 1,000 ppm standard to 1,000 ml to
prepare a 10 ppm standard solution for measurements in ppm.
prepare a 10 ppm standard solution for measurements in ppm.
3.
Add 100 ml of distilled water to a 150 ml beaker. Add 1 ml of low level ISA, place the
beaker on the magnetic stirrer, and begin stirring at a constant rate.
beaker on the magnetic stirrer, and begin stirring at a constant rate.