GB/T 4702.2-2025Chromium metal - Determination of silicon content - Perchloric acid gravimetric method and molybdenum blue spectrophotometric method (English PDF)

1 Scope

This document specifies the methods for determining the silicon content in metallic chromium using the perchloric acid dehydration gravimetric method and the molybdenum blue spectrophotometric method.

This document applies to the determination of silicon content in metallic chromium. Determination range (mass fraction). 0.10%~2.00% by perchloric acid dehydration gravimetric method;

Molybdenum blue spectrophotometry. 0.10%~0.70%.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.

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 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 Method 1.Perchloric acid dehydration by gravimetric method