ISO 14849:1999 PDF
Plastics — Phenol-formaldehyde mouldings — Determination of free ammonia and ammonium compounds — Indophenol method
Plastics — Phenol-formaldehyde mouldings — Determination of free ammonia and ammonium compounds — Indophenol method
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 8
- Дата публикации:
- 12 августа 1999 г.
- Издание:
- ISO IS 14849 edition 1 version 1
- ICS:
- 83.080.10
This International Standard specifies a colorimetric comparison method for the determination of the amount of ammonia and ammonium compounds in phenol-formaldehyde mouldings. NOTE This International Standard does not provide an absolute measure of the amount of ammonia present. The amount of ammonia in a moulded article is of importance when corrosion of metal inserts or contamination of foodstuffs in contact with the article has to be considered.
Abstract
Overview
ISO 14849:1999 specifies a colorimetric comparison method (indophenol method) for determining free ammonia and ammonium compounds in phenol–formaldehyde mouldings. The standard describes sample preparation, extraction, alkaline distillation, and spectrophotometric measurement of the indophenol blue formed from ammonia. It is intended for cases where ammonia content affects corrosion of metal inserts or potential contamination of foodstuffs in contact with the moulded article. Note: the method is comparative and does not claim to give an absolute measure of all ammonia present.
Key topics and technical requirements
- Principle: Extract ammonia from powdered moulding with hot water, distil under alkaline conditions, react distillate with phenol/hypochlorite to produce indophenol blue, and measure absorbance at 630 nm.
- Sample prep: Reduce moulding to powder, sieve to
Технические детали
- Технический комитет
- ISO/TC 61/SC 12 - Thermosetting materials
- SKU
- ISO 14849:1999
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