GB/T 23855-2018Liquid sulphur trioxide (English PDF)

Foreword

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

This standard supersedes GB/T 23855-2009 "Liquid Sulfur Trioxide". Compared with GB/T 23855-2009, the main technical changes are as follows.

--- Modify the amount of sample to determine the mass fraction of sulfur trioxide and sulfur dioxide (see 4.3.3 and 4.4.3, 2009 version 4.2.4 and 4.3.3);

--- Modify the reference solution for spectrophotometric determination of iron mass (see 4.6.1.4.1 and 4.6.1.4.3, 2009 edition of 4.5.4.2 And 4.5.4.3);

--- Increased the visual colorimetric method as the second analytical method for the determination of iron mass fraction, the original spectrophotometric method as the arbitration method (see 4.6.2);

--- Revised the formula for formulating the calculation formula for the determination of sulfur trioxide, sulfur dioxide, ash and iron mass fraction, and added the calculation result table The number of digits or significant digits after the decimal point is specified (see 4.3.4, 4.4.4, 4.5.4, and 4.6.1.5, 4.2.5 of the 2009 edition). 4.3.4, 4.4.4 and 4.5.5);

--- Modify the requirements of the inspection rules (see 5.1, 5.2 and 5.3, 2009 version 5.1, 5.2, 5.3 and 5.5);

--- Modify the requirements for marking, packaging, transportation and storage (see 6.1 and 6.3, 2009 version 6.1 and 6.3);

--- Modify the security requirements (see 7.3 and 7.4, 2009 version 7.2 and 7.4).

Caution

The liquid sulfur trioxide is highly corrosive and hygroscopic. Wear protective equipment when handling. Persons using this standard should There is practical experience in regular laboratory work. This standard does not indicate all possible security issues. Users have the responsibility to take appropriate safety And health measures, and to ensure compliance with the conditions stipulated by relevant national laws and regulations.

1 Scope

This standard specifies the technical requirements, test methods, inspection rules and signs, packaging, transportation, storage and safety of liquid sulfur trioxide.

This standard applies to industrial liquid sulfur trioxide.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this document. For undated references, the latest version (including all amendments) applies to this document.

GB 190 Dangerous Goods Packaging Mark

GB/T 191 packaging, storage and transportation logo

GB/T 601 Preparation of Chemical Reagent Standard Titration Solution

GB/T 602 Preparation of standard solution for determination of impurities in chemical reagents

GB/T 603 Preparation of preparations and products used in chemical reagent test methods

GB/T 6678-2003 General Sampling of Chemical Products

GB/T 6680-2003 sampling rules for liquid chemical products

GB/T 6682 Analysis Laboratory Water Specifications and Test Methods

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

GB 12268 List of dangerous goods

GB 15258 Preparation of Chemical Safety Label

3 Technical requirements

The quality of liquid sulfur trioxide should meet the requirements of Table 1.

Appearance: colorless transparent liquid; colorless transparent or brown liquid; -

Sulfur trioxide (SO3) mass fraction/% >= 99.7; 99.5; 99.0

Sulfur dioxide (SO2) mass fraction/% <= 0.20; 0.40; -

Ash content/% <= 0.05; 0.40; -

Iron (Fe) mass fraction/% <= 0.020; 0.030; -

Note: The "-" in the indicator indicates that there is no such item in the technical requirements of this category of product.