ISO 18068:2014 PDF

Name: ISO 18068:2014 — Cotton fibres — Test method for sugar content — Spectrophotometry
SKU: ISO 18068:2014
Price: 25 EUR
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Cotton fibres — Test method for sugar content — Spectrophotometry

Название (английский):

ISO 18068:2014

Cotton fibres — Test method for sugar content — Spectrophotometry

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 5
Дата публикации:: 24 июля 2014 г.
Издание:: ISO IS 18068 edition 1 version 1
ICS:: 59.060.10

Тип поставки:

Full version75 €Read online 24h10 €Read online 72h15 €

Язык документа:

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Срок поставки:1 раб. дн. (перевод)

Цена:75 €

Описание (английский):

ISO 18068:2014 specifies a test method to determine the total sugar content in cotton fibres. Spectrophotometry is used as a quantitative determination method, and 3,5-dihydroxytoluene-sulfuric acid solution is used as a colour developer. ISO 18068:2014 is applicable to cotton fibres.

Abstract

Overview - ISO 18068:2014 (Cotton fibres - Sugar content - Spectrophotometry)

Key topics and technical requirements

Principle: sugars are extracted from cotton with a fatty acid alkanolamide surfactant, degraded in concentrated H2SO4 to furfural derivatives, then reacted with 3,5‑dihydroxytoluene; absorbance at 425 nm is compared to a calibration curve.
Sampling & specimen size: laboratory sample prepared per ISO 1130; minimum laboratory sample 50 g; three test portions of 2.000 g each are used.
Calibration: stock D‑fructose standard (2.0 mg/ml) is diluted to prepare a series of standards; absorbance (minus blank) builds the calibration curve for mg/ml → percentage sugar.
Apparatus & conditions:
- Spectrophotometer (200–800 nm) and 1 cm cuvettes
- Water bath maintained at (70 ± 2) °C
- Mechanical shaker for extraction (specified amplitudes/frequencies)
- Filters (heat‑resistant glass, pore 40–100 μm)
Reagents: analytical-grade D‑fructose, 3,5‑dihydroxytoluene, sulfuric acid (1.84 g/ml), and fatty acid alkanolamide (extraction and determination concentrations provided).
Calculation & reporting: results expressed as percentage of sugars (formula specified), mean of three determinations, and full test-report requirements (reference to ISO 18068, dates, sample description, calibration range, deviations).

Practical applications and who uses it

Textile testing laboratories use ISO 18068 to monitor cotton fibre quality and to detect elevated sugar levels that can cause storage mildew, fibre metamorphism, or problems during spinning (twining, breakage, lower yarn quality).
Cotton growers & brokers may test batches to support quality specifications.
Spinners and textile manufacturers can apply the method for incoming fibre acceptance and process troubleshooting.
Research institutions studying fibre chemistry or improving pretreatment and storage methods.

Keywords: ISO 18068, cotton fibres sugar content, spectrophotometry, 3,5‑dihydroxytoluene, sulfuric acid, D‑fructose calibration, textile testing.

Related standards

ISO 139:2005 - standard atmospheres for conditioning and testing
ISO 1130:1975 - textile fibre sampling methods
ISO 3696:1987 - water for analytical laboratory use
ISO 4793:1980 - laboratory sintered filters

This standard provides a reproducible, spectrophotometric procedure to quantify sugars in cotton, supporting quality control and process optimization across the textile supply chain.

Технические детали

Технический комитет: ISO/TC 38/SC 23 - Fibres and yarns
SKU: ISO 18068:2014

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