GB/T 12007.2-1989 in English

SUPERSEDED

Epoxide resins-Determination of sodium ion

Issued on:1989-12-15
Implemented on:1990-11-01
File Format:PDF
Delivery:Via email within 1~3 business days

Price(USD)： $100.00
$97.00

Standard No:	GB/T 12007.2-1989
Document status:	SUPERSEDED
Superseded by:	GB/T 12007.2-2025 Epoxy resin—Part 2: Determination of sodium ion
Superseded on:	2026-05-01
Title in English:	Epoxide resins-Determination of sodium ion
Title in Chinese:	环氧树脂钠离子测定方法
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	1989-12-15
Implemented on:	1990-11-01
ICS Classification:	83.080-Plastics
Chinese Classification:	G31-Basic standards and general methods for synthetic resin and plastic
Professional Classification:	GB-National Standard
Related Keywords:	sodium ion sodium ion concentration sodium ion content sodium ion introduction determination sodium ion concentration meter
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Metal Ion Determination Method Epoxy Spectrum GB/T 12007.2 GB/T 12007.2-1989 Epoxy Material Testing How to produce epoxy resin Ion separation method How to measure sodium ions How to measure sodium ions using titration method Determination method of crystallinity of epoxy resin Determination of superoxide anion by NBT Sodium standard curve Calculation method for detection limit of fluoride ion determination method Epoxy resin crystallization detection method National standard method for determination of sodium ions Resin pad pressure test method What are the methods to detect sodium ion concentration? Soil sodium ion detection method and Epoxy resin chloride ion test Summary of measurement methods for ammonium ions Comparison of detection methods for sodium ions in water Determination method of resin acid value National standard detection method for sodium ion content in water Metal ion free radical determination method National standard determination method for aluminum ions Epoxy resin vertical burning test Epoxy Resin International Method for determination of volatile components of epoxy resin Preparation method of cationic liposomes Sodium peroxide national standard detection method Epoxy resin inorganic chlorine test method Determination of sodium ions in plants Sodium peroxide detection method National testing of sodium ions Trace sodium ion determination method Summary of sodium and potassium ion determination methods Epoxy resin industry Sulfide ion identification method High strength epoxy resin Sodium ion content detection method Water-based epoxy resin testing Thunder magnetic ion measurement method for lead ions Ion chromatography sodium ion detection method Method for measuring the concentration of sodium ions Method for detecting sodium ions in feed National standard for detection method of sodium ions in feed Aluminum ion detection method Epoxy resin breaking strength Sodium ion detection method National standard determination method for silver ions Determination of sodium ions by electrochemical method Plant sodium ion determination Cationic lipid screening method Thunder magnetic ion measurement method for chloride ions Detection method of cesium oxide ions in feces sodium ion enterprise Water quality copper ion determination method Anionic resin purification method for nucleic acids Sodium ion online monitoring How to measure epoxy value Method for detecting sodium ions in urine Test method for sodium peroxide cation Epoxy Resin Aging Test Power plant sodium ion method Commonly used methods for detecting potassium and sodium ions in China Method for measuring density of cured epoxy resin products Epoxy resin chloride ion test method Measuring Poisson's ratio of epoxy resin Method for determination of sodium ions by ion chromatography Resin thermogravimetry test method Method for determination of sodium ions in vegetables Method for determination of sodium ions in water samples Principle of sodium ion determination method What are the methods for measuring lipid oxidation? Titration method for sodium ions Method for determining molecular ion peak The methods for determining sodium ions in secondary iron concentrate are: Resin sedimentation detection method

《GB/T 12007.2-1989环氧树脂钠离子测定方法》由TC15（全国塑料标准化技术委员会）归口，TC15SC11（全国塑料标准化技术委员会热固性塑料分会）执行，主管部门为中国石油和化学工业联合会。
本标准规定了用钠离子深度计测定环氧树脂水萃取液中钠离子含量的方法。
本标准适用于双酚A型环氧树脂中钠离子含量的测定。

Introduction

Determination of sodium ions in epoxy resin: standard in-depth analysis

Epoxy resin is an important high-performance material with wide applications in electronics, coatings and composite materials. However, impurity ions such as sodium ions may be introduced during its production process, which can affect the performance of the final product. GB 12007.2-89 "Determination of sodium ions in epoxy resin" provides a standard method for accurately determining the sodium ion content in epoxy resin.

Background and significance of standard formulation

GB 12007.2-89 was proposed by the National Technical Committee for Plastics Standardization to ensure the quality control of epoxy resin. This standard is particularly applicable to bisphenol A epoxy resin, whose sodium ion content directly affects the electrical properties and durability of the material.

Determination Method Overview

Steps	Description
Sample Dissolution	Use a mixed solvent of xylene and cyclohexanone and heat on a magnetic stirrer until completely dissolved.
Water Extraction	Add deionized water, stir and let stand to separate the layers, and separate the water extract for analysis.
pH Adjustment	Adjust the pH of the aqueous phase to above 10 with a saturated barium hydroxide solution to ensure accurate determination of sodium ions.
Concentration determination	The sodium ion concentration in the extract was determined using a sodium ion concentration meter (Instrument model: with sodium ion sensitive electrode and calomel reference electrode).

Actual application case: Determination of sodium ion content in epoxy resin sample

Take a bisphenol A epoxy resin as an example, assuming that its sodium ion content is in the range of 101~500 ppm. According to the recommendations in Table 1, weigh 1~2g of the sample and dissolve and extract according to the standard steps.

Result calculation and analysis

The sodium ion content was calculated using formula (3):

$$ x = \frac{\sum (c_{Na}^{+i} - c_b) m_i - (c_s - c_b) m_s}{m} $$ Where, $x$ is the sodium ion content in the sample (unit: μg/g), and each $c_{Na}^{+}$ is the sodium ion concentration of the extract.

Allowable difference analysis

Range of sodium ion content (ppm)	Allowable difference
15~40	±4
41~85	±6

Implementation suggestions and precautions

Operation suggestions:

Ensure that all reagents used are analytically pure, especially the conductivity of deionized water must be strictly controlled.
When preparing saturated barium hydroxide solution, pay attention to the handling of crystals to avoid introducing impurities.
Instrument calibration is a key step, and it is recommended to use standard solutions for verification regularly.

Data Recording and Analysis:

Record the mass and concentration values of each extraction in detail to ensure the accuracy of the calculation.
Pay attention to the changes in the water blank value and evaluate the potential sources of error during the experiment.

More samples: DL/T 368-2010 JGJ 94-2008 YD/T 3934-2021

Sample only — not a preview of GB/T 12007.2-1989

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