ASTM D1246 Determination of Bromide in Water

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.

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

This information has been sourced, reviewed and adapted from materials provided by Metrohm AG.

For more information on this source, please visit Metrohm AG.

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