GB/T 8570.4-2010Determination of liquefied anhydrous ammonia - Part 4: Residue content - Titrimetric 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 4 of the GB/T 8570.

This part of the replacement of GB/T 8570.4-1988 "liquid anhydrous ammonia residue content determination capacity 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 part of GB/T 8570 specifies the capacity measurement method for liquid anhydrous ammonia (liquid ammonia) residue content.

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 document, Any subsequent amendments (not including corrigenda) or revisions shall not apply to this part, however, it is encouraged to enter into an agreement under this Part The parties study whether the latest versions of these files can be used. For undated references, the latest edition applies to this section.

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

3 Principle

After evaporating the liquid ammonia sample at room temperature, the volume of the evaporated residue was read and the residue was evaporated in the presence of an indicator in the presence of a sulfuric acid standard solution Ammonia in the material, according to the formula, calculate 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.

4.2 Methyl red indicator solution, 1g/L.

5 Instruments

5.1 General laboratory equipment.

5.2 Li Senke acceptor, see Figure 1, the total volume of not less than 500mL, the upper part of the 10mL, the lower tube volume of 1.00mL, the smallest 0.05 mL. The unit is in millimeters.