GB/T 12442 Determination of Hydroxyl groups content in silica glass

Detection Target

Determination of Hydroxyl groups content in silica glass

Overview

This solution conforms to the GB/T 12442 Test method for the hydroxyl groups content of silica glass. Determination of hydroxyl content in quartz glass is based on its absorption at the wavelength of 2.73 μm using infrared spectrometry. This standard specifies the sample preparation, instruments, procedures, and result interpretation for determining hydroxyl content in quartz glass. It applies to the determination of hydroxyl content in transparent quartz glass.

Principle

Infrared spectroscopy is an effective method for qualitative analysis of substances. By utilizing the characteristic absorption peak of hydroxyl groups in quartz within the infrared spectral region (3663 cm^-1), it enables not only qualitative identification but also quantitative analysis of hydroxyl content. Within a specific concentration range, the variation in absorbance values can be applied to an empirical formula to determine hydroxyl concentration.

Operating Conditions

1. Apparatus and Accessories

   1)HKL-12442 FTIR Spectrometer for Hydroxyl Groups of Silica Glass

   2)Hydroxyl Test Attachment: Hydroxyl Test Holder

2. Testing Conditions

   1)Resolution: 4 cm^-1

   2)Scan times: 32

   3)Detector: Pyroelectric Infrared Detector

3. Others

   1)Micrometer: Accuracy up to 0.01 mm

   2)Absolute Ethanol: Analytical Reagent (A.R.)

Sample Preparation

Select test samples from quartz glass products that meet the appearance quality requirements specified in equivalent standards. Measure the sample thickness using a micrometer, then thoroughly clean the samples with absolute ethanol and allow them to dry before testing.

Test Results

1.Test Spectrum

Figure 1 Hydroxyl Group Test Spectrum of Quartz Glass

2.Test Datas

Conclusion

The hydroxyl quantitative analysis system in the HKL-12442 FTIR Spectrometer for Hydroxyl Groups of Silica Glass enables rapid and accurate determination of hydroxyl content in quartz glass. This provides an efficient quality control solution for quartz glass products used in lighting fixtures and related industries.