GB/T 41068-2021Nanotechnologies—Determination of water-soluble anions content in graphene powder—Ion chromatography method (English PDF)

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1. Structure and Drafting Rules of Standardization Documents" drafted.

Introduction

Anionic impurities in graphene powder affect the application value of graphene powder, and will adversely affect the specific properties of the product, such as When graphene powder is used as an electrode material or conductive agent for batteries, anions may cause irreversible side reactions in batteries, resulting in battery performance. decline. Therefore, the type and content of water-soluble anions are one of the important indicators for evaluating the quality of graphene powder.

Ion chromatography has the characteristics of high sensitivity, stable and reliable results, and can measure multiple ions at the same time. The content of water-soluble anions in graphene powder was analyzed.

Warning: Persons using this document should have practical experience with formal laboratory work. This method does not specify any There are security concerns. Some of the experimental procedures specified in this document may lead to hazardous situations, and it is the responsibility of the user to take appropriate safety and health measures, and ensure compliance with the conditions stipulated by the relevant national laws and regulations.

1 Scope

This document describes a method for determining the content of water-soluble anions in graphene powder by ion chromatography.

This document applies to the water-soluble fluoride ion (F-), chloride ion (Cl-), nitrite ion (NO2-), bromide ion in graphene powder Determination of (Br-), nitrate ion (NO3-), sulfate ion (SO42-), phosphate ion (PO43-). Other water-soluble anions contain The determination of the amount can also be performed with reference to this document.

2 Normative references

The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, dated citations documents, only the version corresponding to that date applies to this document; for undated references, the latest edition (including all amendments) applies to this document.

GB/T 6682 Analysis Laboratory Water Specifications and Test Methods

GB/T 8170 Numerical Rounding Rules and Representation and Judgment of Limit Values

GB/T 30544.13 Nanotechnology Terminology Part 13. Graphene and related two-dimensional materials

3 Terms and Definitions

The terms and definitions defined in GB/T 30544.13 and the following apply to this document.

4 Principles

Various water-soluble anions in graphene powder can be extracted with suitable solvents, and separated by a chromatographic column, and then separated by an electron with a suppressor.

Conductivity detector was used to measure the conductivity of each anion component, and qualitatively based on the relative retention time of each component in the standard solution, using the standard curve method Quantitative.

5 Reagents and Materials

5.1 Unless otherwise stated, the reagents used in this method are all analytically pure, and the water is first-grade water that meets the requirements of GB/T 6682.