ISO 2993:1974 PDF

Name: ISO 2993:1974 — Ammonium sulphate for industrial use — Determination of free acidity — Titrimetric method
SKU: ISO 2993:1974
Price: 25 EUR
Availability: InStock

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

Название (английский):

ISO 2993:1974

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

Статус документа:: Отменён
Формат:: Электронный (PDF)
Количество страниц:: 2
Дата публикации:: 1 апреля 1974 г.
Издание:: ISO IS 2993 edition 1 version 1
ICS:: 71.060.50

Тип поставки:

Full version30 €Read online 24h10 €Read online 72h15 €

Язык документа:

ruen

Срок поставки:1 раб. дн. (перевод)

Цена:30 €

Описание (английский):

Applicable to products having a free acidity, expressed as H2 SO4 , equal to or more than 0.01 % (m/m). Dissolution of a test portion in Water and titration with standard volumetric sodium hydroxide solution in the presence of an indicator. The indicator must have a colour change in the pH range between 5.2 and 5.6. Has also been approved by the IUPAC.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 2993:1974 specifies a titrimetric method for determining the free acidity in ammonium sulphate for industrial use. Applicable to products with free acidity (expressed as H2SO4) of ≥ 0.01% (m/m), the standard describes dissolving a test portion in water and titrating with 0.1 N sodium hydroxide in the presence of a suitable pH indicator. ISO 2993 is also approved by IUPAC, ensuring international recognition for laboratory and quality-control use.

Key topics and technical requirements

Scope: Determination of free acidity in industrial ammonium sulfate when ≥ 0.01% H2SO4.

Test portion: Approximately 100 g of sample (weighed to 0.1 g).

Sample preparation: Dissolve in about 500 ml of water at 20–25 °C; filter if turbid and collect filtrate and washings.

Titrant: 0.1 N standard volumetric sodium hydroxide solution.

Indicator: Methyl purple (10%) or any indicator with a colour change in the pH range 5.2–5.6. Endpoint described as red‑violet to brilliant green.

Alternate endpoint detection: Titration may be performed using a pH meter instead of a visual indicator.

Calculation: Free acidity expressed as % H2SO4 is calculated from the volume (mL) of 0.1 N NaOH used and the mass of the test portion, using the factor that 1 mL of 0.1 N NaOH corresponds to 0.0049 g H2SO4.

Apparatus: Ordinary laboratory glassware and equipment; no specialized instruments required.

Applications and who uses it

ISO 2993 is intended for:

Manufacturers of ammonium sulphate (fertilizer and industrial grades) for product specification and quality control.

Analytical and QC laboratories performing routine acidity checks on incoming or final product batches.

Procurement and compliance teams specifying acceptable acidity limits in contracts and technical specifications.

Regulatory bodies and certification labs verifying product conformity with international testing practices.

Practical benefits include simple, reproducible titrimetric testing that supports process control, product quality assurance, and supplier verification.

Related standards

The standard is part of a series of test methods for industrial ammonium sulphate:

ISO 2992 – Iron content (2,2’-bipyridyl photometric method)

ISO 2994 – Matter insoluble in water (gravimetric)

ISO 3332 / 3333 – Related determinations (ammoniacal nitrogen, copper content) - see annex for status

Keywords: ISO 2993, ammonium sulphate, free acidity, titrimetric method, H2SO4 determination, 0.1 N sodium hydroxide, methyl purple, industrial quality control.

ISO 2993:1974 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications and who uses it

Related standards

Технические детали

ISO 2992:1974

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

BS ISO 29943-1:2017

Condoms. Guidance on clinical studies. Male condoms, clinical function studies based on self-reports.

ISO 3332:1975

Ammonium sulphate for industrial use — Determination of ammoniacal nitrogen content — Titrimetric method afte…