SIST ISO 2174:1995 PDF

Name: SIST ISO 2174:1995 — Surface active agents -- Preparation of water with known calcium hardness
SKU: SIST ISO 2174:1995
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Surface active agents -- Preparation of water with known calcium hardness

Название (английский):

SIST ISO 2174:1995

Surface active agents -- Preparation of water with known calcium hardness

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 6
Дата публикации:: 1 августа 1995 г.
ICS:: 71.100.40
Технический комитет:: KDS - Cosmetics, chemical disinfectants and surface active agents

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Описание (английский):

A stock solution is prepared by dissolving an appropriate quantity of calcium chloride in water. The calcium content of this stock solution is determined by complexometric titration with the disodium salt of (ethylenedinitrilo)tetraacetic acid (EDTA) using a mixture of Mordant Black 11 (C.I. 14645) and methyl red as indicator. Dilute solutions of the hardness required are prepared by dilution of appropriate volumes of the stock solution.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 2174:1990 - "Surface active agents - Preparation of water with known calcium hardness" specifies a laboratory method to prepare and verify aqueous solutions of defined calcium hardness for testing surfactants and related products. The standard describes making a concentrated stock solution from calcium chloride, determining its calcium content by complexometric titration with EDTA, and preparing working waters of required hardness by dilution.

Key Topics

Purpose: Provide reproducible water of known calcium hardness (expressed in mmol/l) for surfactant testing.

Units and conversions: Uses mmol/l for hardness (1 mmol/l Ca2+ = 40.08 mg Ca2+/L); Annex A gives conversion factors to other hardness units.

Reagents:

Calcium chloride dihydrate (CaCl2·2H2O) stock preparation (example: 220.5 g dissolved to 5 L to produce ≈300 mmol Ca2+/L).
Standardized disodium EDTA solution (c = 0.05 mol/L) for titration.
Mixed indicator (Mordant Black 11/C.I. 14645 blended with methyl red and Mg‑EDTA) and ammoniacal solution (note: contains cyanide in the procedure - see safety).

Analytical method:

Determine calcium concentration of the stock by complexometric titration of an aliquot with EDTA until the mixed indicator changes color (red → green).
Calculate stock concentration from titrant volume and EDTA concentration; then compute required stock volume for specified hardness and dilute to volume.

Apparatus: Class A volumetric flasks, pipettes, burette, 5 L glass bottle, conical flasks and analytical balance (standards referenced for glassware and laboratory water).

Applications and Who Uses It

Laboratories performing surfactant performance and stability tests where water hardness affects foam, detergency, and product behavior.

Chemical and consumer product manufacturers needing standardized test waters for QA, R&D, method validation, and inter-laboratory comparison.

Test houses and standards organizations that require reproducible water hardness preparation for protocols involving surface active agents.

Practical benefits: reproducible test waters, clear calculation and dilution steps, and traceable EDTA titration to quantify calcium content before use.

Related Standards

ISO 3696 - Laboratory water quality

ISO 385-1 - Burettes

ISO 1042 - Volumetric flasks

ISO 648 - Pipettes

ISO 1773 - Conical flasks and flasks

Note: follow laboratory safety precautions (especially when preparing ammoniacal cyanide-containing reagents) and use the standard for exact formulas, equations and procedural details.

SIST ISO 2174:1995 PDF

Abstract

Похожие стандарты

Overview

Key Topics

Applications and Who Uses It

Related Standards

Технические детали

ISO 2174:1990

Surface active agents — Preparation of water with known calcium hardness

SIST EN ISO 3696:1998

Water for analytical laboratory use - Specification and test methods (ISO 3696:1987)

ISO 385-1:1984

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