Determining Trimethylamine and Standard Cation Contents in 30% Hydrogen Peroxide

Table of Contents

Introduction
Sample
Sample Preparation
Columns
Solutions
Analysis
Parameters
Results
Instrumentation

Introduction

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

Eluent

5.0 mmol/L nitric acid

50 μg/L rubidium

Suppressor regenerant

70 mmol/L sodium carbonate

70 mmol/L sodium hydrogen carbonate

Rinsing solution

STREAM

Matrix elimination

Ultrpure water (ELGA)

Analysis

Conductivity detection after the sequential suppression

Parameters

Flow rate

1.0 mL/minutes

Injection volume

1000 μL

Pmax

15 Mpa

Recording time

18 minutes

Column temperature

40 °C

Instrumentation

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

Results

Cation

Conc. [μg/L]

RSD [%]

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

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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