Bromide (Br) is a naturally occurring element that is typically found in seawater sources at a concentration of approximately 65 mg/L, as well as in drinking water at a concentration of approximately 0.5 mg/L in drinking water. If the Br concentrations exceed these levels, it may be indicative of contamination by fertilizers, road salt or industrial wastewater in the ground water. The following experimental data has been shown to determine the concentration of bromide in water by utilizing a Br ion-selective electrode according to ASTM D1246.
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The water samples were initially spiked with a 75 mg/L or 130 mg/L concentration of Br. A volume of 100 mL of the sample was then pipetted into a sample beaker, following which 2 mL of ISA was added and stirred vigorously for 1 minute. The Br ion-selective electrodes were then placed in the sample solution and stirred for two minutes. The Br concentration was then measured when stirring ceased.
Configuration
| . |
. |
| 867 pH module |
2.867.0010 |
| 814 USB Sample Processor (1T/2P) |
2.814.0020 |
| 800 Dosino, 2x |
2.800.0010 |
| 741 Magnetic stirrer |
2.741.0010 |
| Dosing unit 2 mL, (ISA) |
6.3032.120 |
| Dosing unit 50 mL, (sample) |
6.3032.250 |
| Sample rack, PP, 22x 120 mL |
6.2041.470 |
| Sample beaker, PP, 120 mL |
6.1459.300 |
| Titration head, 3x NS 14 |
6.1458.040 |
| Ion-selective electrode, Br |
6.0502.100 |
| LL ISE reference |
6.0750.100 |
| Pt 1000 temperature sensor |
6.1110.100 |
| Electrode cable 2 m / F |
6.2104.030 |
| Strand / 2 m / 2 x B |
6.2106.060 |
| Electrode cable 2 m, 2 x 2 mm |
6.2104.150 |
| tiamoTM 2.5 |
6.6056.252 |
Solutions
| Ionic Strength Adjustor (ISA) |
ß(NaNO3) = 425 g/L, if possible this solution
should be bought from a supplier. |
Parameters
| Mode |
MEAS Conc |
| Stirring rate |
Off |
| Signal drift |
1 mV/min |
| Min. waiting time |
60 s |
| Max. waiting time |
200 s |
| Measuring interval |
2 s |
| Stop signal |
Off |
Results
| Bromide concentration (n = 5) |
Recovery / % |
s(rel) / % |
| 75.5 mg/L |
101.0 |
0.6 |
| 129.7 mg/L |
99.8 |
0.8 |
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This information has been sourced, reviewed and adapted from materials provided by Metrohm AG.
For more information on this source, please visit Metrohm AG.