GB/T 41456-2022Nanotechnologies—Determination of the concentration of nanometer titanium dioxide airborne dust in workplace—Spectrophotometry 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.

1 Scope

This document specifies a spectrophotometric method for the determination of nano-titanium dioxide dust concentrations in production ambient air, including sample collection And processing, testing, data processing, result calculation.

This document applies to the use of a spectrophotometer to detect the concentration of nano-titanium dioxide dust collected by wet methods. Other Ambient Air Nano II The determination of titanium oxide concentration can refer 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 30544.4 Nanotechnology Terminology Part 4: Nanostructured Materials

JJG 880 Turbidimeter

JJG 956 Atmospheric Sampler

3 Terms and Definitions

The terms and definitions defined in GB/T 30544.4 and the following apply to this document.

4 Principle of the measurement method

Using an atmospheric sampler, the nano-TiO2 dust in the air was collected into the capture liquid to form a titanium dioxide dust dispersion. Dioxide Titanium oxysulfate (see chemical reaction formula 1), the digestion product of titanium, undergoes complexation reaction with diantipyridine methane (DAPM) or hydrogen peroxide (H2O2).

In response, complex complexes with significant color are generated (see chemical reaction formula 2 and chemical reaction formula 3, respectively). Use a spectrophotometer to test the complexes in the corresponding The absorbance at the maximum absorption wavelength, the absorbance of the complex is proportional to the concentration of titanium dioxide within a certain range. Combined Air Sample Collector The concentration of titanium dioxide dust in the ambient air was calculated by using parameters such as volume and dispersion volume.