★Низкие цены. Оригиналы и переводы — экономьте время и бюджет.

Каталог Подписки О компании Поддержка и оплата Публичная оферта Контакты

Поиск

Корзинапуста

GLSTDStandards Store

Официальный магазин стандартов ГОСТ, ISO, ASTM. Электронная доставка, актуальные редакции, прозрачные цены.

Компания

О компании
Контакты
Поддержка и оплата

Помощь

Каталог
Корзина
Поиск

Правовая информация

Публичная оферта
Политика конфиденциальности
Условия использования

Способы оплаты:

//ISO 11923:1997

ISO 11923:1997

Name: ISO 11923:1997 — Water quality — Determination of suspended solids by filtration through glass-fibre filters
SKU: ISO 11923:1997
Price: 25 EUR
Availability: InStock

Water quality — Determination of suspended solids by filtration through glass-fibre filters

Название (английский):

ISO 11923:1997

Water quality — Determination of suspended solids by filtration through glass-fibre filters

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 6
Дата публикации:: 22 января 1997 г.
Издание:: ISO IS 11923 edition 1 version 1
ICS:: 13.060.60

Тип поставки:

Full version25 €Ask AI2 €Read online 24h10 €Read online 72h15 €

Язык документа:

ruen

Срок поставки:1 рабочий день

Цена:25 €

Описание (английский):

Describes a method for the determination of suspended solids in raw waters and waste waters by filtration though glass-fibre filters. The lower limit of the determination is approximately 2 mg/l. Floating oil and other immiscible organic liquids interfere.

Abstract

Overview

ISO 11923:1997 specifies a standardized laboratory method for the determination of in raw waters, waste waters and effluents by filtration through . The method uses vacuum or pressure filtration, drying at 105 °C and gravimetric weighing. The practical lower reporting limit is approximately ; no upper limit is defined. The standard also notes key interferences (notably floating oil and other immiscible organic liquids) and sampling stability issues.

Key topics and requirements

Principle: Filter a measured sample volume, dry the filter at 105 °C ± 2 °C, and determine the mass increase gravimetrically.
Filters: Use borosilicate glass‑fibre filters containing no binders. Mass loss in a blank must be < 0.3 mg per filter; areic mass typically 50–100 g/m².
Equipment: Vacuum or pressure filtration apparatus, drying oven (105 °C ± 2 °C), analytical balance with at least 0.1 mg resolution, suitable drying supports.
Sample handling:
- Prefer analysis within 4 hours of sampling; if stored, keep dark at < 8 °C (do not freeze).
- Do not add chemical preservatives for suspended solids analysis.
- Report any storage time > 4 hours in the test report.
Procedure specifics:
- Select sample volume so dry residue on filter is optimally 5–50 mg; results must be based on at least 2 mg dry residue. Avoid sample volumes > 1 L.
- For samples with > 1 000 mg/L dissolved solids, use extended washing (three 50 mL washes).
- Calculation: p (mg/L) = 1000 × (b − a) / V where b = filter mass after filtration (mg), a = filter mass before filtration (mg), V = sample volume (mL).
Quality control: Run a control using the working reference cellulose suspension; recovery should be 90–110%.
Interferences: Floating oil/immiscible organics can bias results; Annex B describes oil removal (ethanol then hexane) but requires reporting if used.
Reporting: Include filter manufacturer/type, sample ID, date/place, any deviations, and result (below 2 mg/L reported as “below 2 mg/L”).

Applications and users

Environmental and compliance monitoring of rivers, lakes, raw water intakes and wastewater effluents
Wastewater treatment plant performance checks and process control
Contract and regulatory testing laboratories, environmental consultants, research institutions, and water utilities
Useful for sediment load measurements, turbidity correlation studies and routine operational monitoring

Related standards

ISO 5667-2:1991 - Water quality - Sampling - Part 2: Guidance on sampling techniques
ISO 6107-2 - Water quality - Terminology (referenced for definitions)

Keywords: ISO 11923, water quality, suspended solids, filtration, glass‑fibre filters, wastewater testing, effluent monitoring, gravimetric determination.

Технические детали

Технический комитет: ISO/TC 147/SC 2 - Physical, chemical and biochemical methods
SKU: ISO 11923:1997

Главная

Каталог

ISO 5667-2:1991

Отменён

Water quality — Sampling — Part 2: Guidance on sampling techniques

9 · PDF

25 €

ISO 6107-2:2006

Отменён

Overview - ISO 8668-5:1992 (Aircraft terminal junction systems, Type 3) ISO 8668-5:1992 defines the detail specification for Type 3 Terminal Junction Systems (TJS) used in aircraft electrical install…

59 · PDF

25 €

Открыть превью (2 стр.)

ISO 11923:1997

Abstract

Overview

Похожие стандарты

Key topics and requirements

Applications and users

Related standards

Технические детали

ISO 5667-2:1991

Water quality — Sampling — Part 2: Guidance on sampling techniques

ISO 6107-2:2006

Water quality — Vocabulary — Part 2:

ISO 8212:1986

Soaps and detergents — Techniques of sampling during manufacture

ISO 20662:2020

Ships and marine technology — Hopper dredger supervisory and control systems

ISO 3021:2023

Adventure tourism — Hiking and trekking activities — Requirements and recommendations

ISO 3826-2:2008

Plastics collapsible containers for human blood and blood components — Part 2: Graphical symbols for use on l…

ISO/IEC 24730-1:2014

Information technology — Real-time locating systems (RTLS) — Part 1: Application programming interface (API)

ISO 8668-5:1992

Aircraft — Terminal junction systems — Part 5: Detail specification for type 3 system