GB/T 4333.11-2025Ferrosilicon - Determination of titanium content - Diantipyrylmethane photometric method (English PDF)

1 Scope

This document specifies the method for determining the titanium content in ferrosilicon using the diantipyrrolidone spectrophotometric method.

This document applies to the determination of titanium content in ferrosilicon, with a determination range (mass fraction) of 0.005 0% to 0.50%.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are listed below.

For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.

This document.

GB/T 4010 Sample collection and preparation for chemical analysis of ferroalloys

GB/T 6379.1 Accuracy (correctness and precision) of measurement methods and results - Part 1.General principles and definitions

GB/T 6379.2 Accuracy (correctness and precision) of measurement methods and results - Part 2.Determining the repeatability of standard measurement methods

Basic methods of sex and representation

GB/T 6682 Specifications and test methods for water used in analytical laboratories

GB/T 7729 General Rules for Chemical Analysis of Metallurgical Products - Spectrophotometric Method

GB/T 8170 Rules for rounding off numerical values and the representation and determination of limiting values

GB/T 12806 Laboratory Glassware - Single-mark volumetric flasks

GB/T 12807 Graduated Pipettes for Laboratory Glassware

GB/T 12808 Laboratory Glassware - Single-mark Pipettes

3 Terms and Definitions

This document does not contain any terms or definitions that need to be defined.

4 Principles

The sample was decomposed using nitric acid, hydrofluoric acid, and sulfuric acid. A portion of the solution was then separated and, in hydrochloric acid medium, ascorbic acid was used to eliminate the colored ions of iron and chromium.

Interference was eliminated. Titanium ions reacted with diantipyrin methane to form a yellow complex. The absorbance was measured at 385 nm, and the mass fraction of titanium was calculated.

5 Reagents

Unless otherwise specified, only approved analytical grade reagents and distilled water of grade III or higher conforming to GB/T 6682 or equivalent should be used in the analysis.

It is water of fairly high purity. […]