Hydrogen peroxide (H2O2) is supplied in a variety of purity grades based on its applications. Very low contamination levels should be present in high purity H2O2 (electronic grade), for instance, below 1 μg/L of trimethylamine (TMA).
This article discusses the determination of trimethylamine content in a high-purity H2O2 solution (30%). Inline preconcentration with matrix elimination (MiPCT-ME) is used to perform the analysis by applying conductivity detection following the sequential cation suppression.
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Sample
Hydrogen peroxide (30%)
Sample preparation
Metrohm intelligent preconcentration technique with inline matrix elimination (MiPCT-ME).
Columns
|
Metrosep C Supp 1 - 250/4.0
|
6.1052.430
|
|
Metrosep C Supp 1 Guard/4.0
|
6.1052.500
|
|
Metrosep C PCC 1 HC/4.0
|
6.1010.310
|
|
2 x Metrosep I Trap 1 - 100/4.0
|
6.1014.200
|
Solutions
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Eluent
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5.0 mmol/L nitric acid
50 μg/L rubidium
|
|
Suppressor regenerant
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70 mmol/L sodium carbonate
70 mmol/L sodium hydrogen carbonate
|
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Rinsing solution
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STREAM
|
|
Matrix elimination
|
Ultrpure water (ELGA)
|
Analysis
Conductivity detection after the sequential suppression
Parameters
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Flow rate
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1.0 mL/minutes
|
|
Injection volume
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1000 μL
|
|
Pmax
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15 Mpa
|
|
Recording time
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18 minutes
|
|
Column temperature
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40 °C
|
Instrumentation
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930 Compact IC Flex Oven/SeS/PP/Deg
|
2.930.2560
|
|
IC Conductivity Detector
|
2.850.9010
|
|
858 Professional Sample Processor
|
2.858.0010
|
|
2 x 800 Dosino
|
2.800.0010
|
|
MSM-HC Rotor C
|
6.2842.200
|
|
IC equipment: MiPCT-ME
|
6.5330.160
|
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Results
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Cation
|
Conc. [μg/L]
|
RSD [%]
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Recovery [%]
|
|
1
|
Lithium
|
n.d.
|
-
|
79
|
|
2
|
Sodium
|
0.39
|
2.6
|
89
|
|
3
|
Ammonium
|
1.83
|
4.1
|
87
|
|
4
|
Potassium
|
0.20
|
12
|
|
|
5
|
TMA
|
0.71
|
3.3
|
74
|
|
6
|
Magnesium
|
0.55
|
5.5
|
84
|
|
7
|
Calcium
|
0.97
|
4.1
|
142
|
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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.