GB/T 8704.6-2020Ferrovanadium—Determination of silicon content—The sulfuric acid dehydration gralimetric method and the silicomolybdic blue photometric method (English PDF)

Foreword

GB/T 8704 Fe-Vanadium analysis method is divided into the following 8 parts 1).

---Determination of vanadium iron carbon content Infrared absorption method and gas volume method (GB/T 8704.1);

---Determination of vanadium iron and sulfur content Infrared absorption method and combustion neutralization titration method (GB/T 8704.3);

---Determination of vanadium iron vanadium content ammonium ferrous sulfate titration method and potentiometric titration method (GB/T 8704.5);

---Determination of vanadium iron silicon content by sulfuric acid dehydration gravimetric method and silicon molybdenum blue spectrophotometry (GB/T 8704.6);

---Determination of vanadium-iron-phosphorus content Molybdenum blue spectrophotometry (GB/T 8704.7);

---Determination of the content of vanadium, iron and aluminum by chrome azurol S spectrophotometry and EDTA titration method (GB/T 8704.8);

---Determination of vanadium iron manganese content potassium periodate photometric method and flame atomic absorption spectrometry (GB/T 8704.9);

---Determination of vanadium iron silicon, manganese, phosphorus, aluminum, copper, chromium, nickel, titanium content by inductively coupled plasma atomic emission spectrometry (GB/T 8704.10).

This part is Part 6 of GB/T 8704.

This section was drafted in accordance with the rules given in GB/T 1.1-2009.

This part replaces GB/T 8704.6-2007 "Determination of vanadium-iron-silicon content by sulfuric acid dehydration gravimetric method". This section is related to Compared with GB/T 8704.6-2007, the main technical changes are as follows.

--- Modified the content of normative references (see Chapter 2, Chapter 2 of the 2007 edition);

--- Added "instrument" (see 3.3);

--- Added "Verification Test" (see 3.5.4);

--- Added "Determining and Representing Analysis Results" (see 3.6.2);

--- Replace the allowable difference with the repeatability limit r and reproducibility limit R (see Chapter 8 of 3.7, 2007 edition);

--- Added silicon molybdenum blue spectrophotometry (see Chapter 4);

--- Added Appendix A and Appendix B.

1 Scope

This part of GB/T 8704 specifies sulfuric acid dehydration gravimetric method and silicon molybdenum blue spectrophotometric determination of silicon content.

This section applies to the determination of silicon content in iron vanadium, the determination range (mass fraction). 0.10% ~ 3.50%.

2 Normative references

The following documents are essential for the application of this document. For dated reference documents, only the dated version applies to this document. For the cited documents without date, the latest version (including all amendments) applies to this document.

Selection and preparation of GB/T 4010 samples for chemical analysis of ferroalloys

GB/T 6379.1 Accuracy of measurement methods and results (correctness and precision) Part 1: General rules and definitions

GB/T 6379.2 Accuracy of measurement methods and results (correctness and precision) Part 2: Determination of repetition of standard measurement methods Basic methods of sex and reproducibility

GB/T 6682 Analysis of laboratory water specifications and test methods

GB/T 8170 Numerical Rounding Rules and Representation and Judgment of Limit Values

GB/T 12806 Laboratory glass instrument single mark volumetric flask

GB/T 12807 Laboratory glass instrument graduation pipette

GB/T 12808 Laboratory glass instrument single mark pipette

3 Method 1: Sulfuric acid dehydration gravimetric method