GB/T 8570.2-2010Determination of liquefied anhydrous ammonia - Part 2: Estimating of ammonia content (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 2 of GB/T 8570.

This part of the replacement GB/T 8570.2-1988 "Determination of liquid ammonia ammonia content." 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 method for calculating the ammonia content of liquid anhydrous ammonia (liquid ammonia).

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.

Methods for the determination of anhydrous ammonia - Part 3. Residue content - Gravimetric method GB/T Methods for the determination of anhydrous ammonia - Part 4. Residue content volumetric method GB/T

3 Principle

Liquid ammonia ammonia content is deducted by weight or volumetric method of liquid ammonia residue content, the mass fraction of ammonia.

4 Analysis of the results of the expression

Ammonia content w1 (by weight method) and w2 (by volume method), the mass fraction of ammonia, the value in%, respectively, according to (1) and (2)

Calculate. w1 = 100 - w3 (1) w2 = 100 - w4 (2)

Where. w3 --- Residual content measured by GB/T 8570.3,%; w4 --- according to GB/T 8570.4 measured the amount of residue,%.

Where 100 minus the weight of the residue measured by the weight method is the arbitration method.

The results are expressed as two digits after the decimal point, and the arithmetic mean of the two parallel calculations is taken as the result of the measurement.

5 Allow difference

The absolute difference between the parallel calculation results shall meet the requirements of Table 1.