GB/T 8570.3-2010Determination of liquefied anhydrous ammonia - Part 3: Residue content - Gravimetric method (English PDF)

Foreword

GB/T 8570 "Determination of liquid anhydrous ammonia method" is divided into seven parts.

- Part 1. Adoption of laboratory samples;

- Part 2. Ammonia content;

- Part 3. Residue content weight method;

- Part 4. Residual content volumetric method;

- Part 5. Moisture Fisher Fischer;

- Part 6. Oil content gravimetric and infrared absorption spectroscopy;

- Part 7. Iron content - phenanthroline spectrophotometric method.

This part is part 3 of GB/T 8570.

This part of the replacement of GB/T 8570.3-1988 "liquid anhydrous ammonia residue content determination of weight method." The main differences between this edition and the previous edition are.

Preparation and calibration of reagent solutions, standard titration solutions, etc. Execution of HG/T 2843 standards;

--- increase the contents of the security warning;

- standardize the standard format according to the new requirements.

1 Scope

This standard specifies the determination of liquid anhydrous ammonia (liquid ammonia) residue by gravimetric method.

This standard applies to products with a residue content of not less than 0.02%, and an arbitration method for determining the content of residues.

Note: If the residue content is lower than the lower limit of the standard measurement method, the report is the mass fraction < 0.02%.

2 Normative reference documents

The terms of this document are the terms of this part by reference to this part of GB/T 8570. Any reference to the date of the text, All subsequent amendments (excluding corrigenda) or revisions do not apply to this part, however, encouragement under this section The parties to the agreement study whether the latest version of these documents can be used. For undated references, the latest edition of this document applies section.

GB/T 8570.1-2008 Methods for the determination of liquid anhydrous ammonia - Part 1: Adoption of laboratory samples

HG/T 2843 chemical analysis of chemical fertilizers commonly used standard titration solution, standard solution, reagent solution and indicator solution

3 Principle

After evaporation of the liquid ammonia sample at room temperature, the evaporation residue was weighed and the residue was titrated in a standard solution of sulfuric acid in the presence of an indicator Of the ammonia, the amount of residue obtained by subtracting the measured ammonia content from the residue of the residue, and obtaining the residue content.

4 Reagents and materials

The reagents, solutions and water used in this part shall comply with the requirements of HG/T 2843 when not specified and formulated.

4.1 sulfuric acid solution. about 10%.

4.3 methyl red indicator solution. 1g/L.

4.4 Refrigerants. solid carbon dioxide (dry ice) and industrial alcohol mixture, the cooling temperature -35 °C ~ -40 °C;

4.5 Grease, lubricating glass piston.

5 Instruments

5.1 General laboratory equipment.