ISO 3332:1975 PDF

Name: ISO 3332:1975 — Ammonium sulphate for industrial use — Determination of ammoniacal nitrogen content — Titrimetric method after distillation
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Ammonium sulphate for industrial use — Determination of ammoniacal nitrogen content — Titrimetric method after distillation

Название (английский):

ISO 3332:1975

Ammonium sulphate for industrial use — Determination of ammoniacal nitrogen content — Titrimetric method after distillation

Статус документа:: Отменён
Формат:: Электронный (PDF)
Количество страниц:: 4
Дата публикации:: 1 июля 1975 г.
Издание:: ISO IS 3332 edition 1 version 1
ICS:: 71.060.50

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Описание (английский):

Based on dissolution of a test sample in water, distillation of the ammonia after displacement by an alkali solution. Absorption in an excess of standard volumetric sulphuric acid solution and back-titration with standard volumetric sodium hydroxide solution in the presence of methyl red/methylene blue mixed indicator. A typical distillation apparatus is shown in a figure.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 3332:1975 specifies a titrimetric (volumetric) method after distillation for determining the ammoniacal nitrogen content of ammonium sulphate for industrial use. The method is based on displacing ammonia from a dissolved test sample with alkali, distilling the liberated ammonia into an excess of standard sulfuric acid, and back‑titrating the excess acid with standard sodium hydroxide using a mixed methyl red/methylene blue indicator.

Keywords: ISO 3332:1975, ammonium sulphate, ammoniacal nitrogen, titrimetric method, distillation, volumetric analysis, back‑titration.

Key topics and requirements

Scope: Quantitative determination of ammoniacal nitrogen in industrial ammonium sulphate.

Reagents (analytical grade):

Sodium hydroxide (450 g/L) for distillation displacement.
Standard volumetric sulfuric acid (0.5 N) for ammonia absorption.
Standard volumetric sodium hydroxide (0.5 N) for back‑titration.
Mixed indicator (methyl red + methylene blue in ethanol).

Apparatus: Quantitative distillation assembly (distillation flask, splash head with dropping funnel, Liebig condenser, receiving conical flask ~500 ml); typical apparatus illustrated in the standard. Use anti‑bumping granules, silicone grease on joints and spring clamps.

Sample & procedure essentials:

Test portion: ~10.000 g (weigh to 0.001 g).
Dissolve sample in water in a 1 000 ml distillation flask, add 20 ml of NaOH (450 g/L) via dropping funnel to displace ammonia.
Distil; absorb ammonia in ~40 ml of 0.5 N H2SO4 (in receiving flask) diluted with water and indicator until receiving volume reaches ~250–300 ml.
Back‑titrate the excess H2SO4 with 0.5 N NaOH to the indicator endpoint. Perform a simultaneous blank.

Calculation: The mass of nitrogen corresponding to 1 ml of 0.5 N H2SO4 is 0.007004 g. Ammoniacal nitrogen (%) is calculated from the difference in titrant volumes (determination minus blank), the 0.007004 factor and the sample mass.

Applications and users

Practical for quality control laboratories, fertilizer manufacturers, industrial chemical producers, incoming/outgoing goods inspection, and regulatory testing where accurate ammoniacal nitrogen measurement in ammonium sulphate is required.

Useful for ensuring product conformity, specifying fertilizer N content, and troubleshooting production or storage issues that affect ammonia losses.

Related standards

ISO 3332 is part of a family of ISO methods for ammonium sulphate testing. Related standards include:

ISO 2992 (iron content - photometric)

ISO 2993 (free acidity - titrimetric)

ISO 2994 (insoluble matter - gravimetric)

ISO 3333 (copper content - photometric)

ISO 3694 (chlorides - potentiometric)

For implementation, follow the full ISO 3332:1975 text for exact procedural details, apparatus drawings and reporting requirements.

ISO 3332:1975 PDF

Abstract

Похожие стандарты

Overview

Key topics and requirements

Applications and users

Related standards

Технические детали

ISO 2992:1974

Ammonium sulphate for industrial use — Determination of iron content — 2,2'- Bipyridyl photometric method

ISO 2993:1974

Ammonium sulphate for industrial use — Determination of free acidity — Titrimetric method

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ISO 3333:1975

Ammonium sulphate for industrial use — Determination of copper content — Zinc dibenzyldithiocarbamate photome…

ISO 3694:1977

Ammonium sulphate for industrial use — Determination of chloride ions content — Potentiometric method