ISO 5810:1982 PDF

Starches and derived products — Determination of chloride content — Potentiometric method

Название (английский):

ISO 5810:1982

Starches and derived products — Determination of chloride content — Potentiometric method

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 2
Дата публикации:: 1 декабря 1982 г.
Издание:: ISO IS 5810 edition 1 version 1
ICS:: 67.180.20

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Описание (английский):

A solution or suspension of the sample is titrated with a standard volumetric silver nitrate solution. The method is not applied to cationic starches and amyloids soluble when cold.

Технические детали

Технический комитет: ISO/TC 93 - Starch (including derivatives and by-products)
SKU: ISO 5810:1982

Abstract

Overview

ISO 5810:1982 specifies a potentiometric titration method for determining the chloride content of starches and derived products. The method uses a standard volumetric silver nitrate (AgNO3) solution and potentiometric end‑point detection. It is not applicable to cationic starches or amyloids that are soluble when cold (their high viscosity prevents correct stirring). The result is reported as sodium chloride (NaCl) percentage by mass.

Key topics and technical requirements

Principle: Potentiometric titration of a solution or suspension of the sample with standard AgNO3; end‑point is the inflection point of the potentiometric curve.
Reagents: Concentrated nitric acid (HNO3) and standard volumetric silver nitrate solution (typical concentrations 0.05 mol·L–1 or 0.02 mol·L–1).
Electrodes and instrumentation:
- Silver/silver chloride indicator electrode (can be prepared or purchased).
- Suitable reference electrode.
- Potentiometer or pH‑meter with millivolt scale and calibration.
- Variable‑speed stirrer to ensure homogeneous suspension.
Apparatus: Standard laboratory glassware (beakers, 1 mL pipettes complying with ISO 648, 10 mL burettes complying with ISO 385/2), analytical balance.
Sample preparation and test portions: Samples must be homogenized. Test portion mass is chosen by expected chloride content:

Overview

Key topics and technical requirements

Principle: Potentiometric titration of a solution or suspension of the sample with standard AgNO3; end‑point is the inflection point of the potentiometric curve.
Reagents: Concentrated nitric acid (HNO3) and standard volumetric silver nitrate solution (typical concentrations 0.05 mol·L–1 or 0.02 mol·L–1).
Electrodes and instrumentation:
- Silver/silver chloride indicator electrode (can be prepared or purchased).
- Suitable reference electrode.
- Potentiometer or pH‑meter with millivolt scale and calibration.
- Variable‑speed stirrer to ensure homogeneous suspension.
Apparatus: Standard laboratory glassware (beakers, 1 mL pipettes complying with ISO 648, 10 mL burettes complying with ISO 385/2), analytical balance.
Sample preparation and test portions: Samples must be homogenized. Test portion mass is chosen by expected chloride content:

ISO 5810:1982 PDF

Технические детали

Abstract

Overview

Key topics and technical requirements

Sample preparation and test portions: Samples must be homogenized. Test portion mass is chosen by expected chloride content:

Похожие стандарты

Abstract

Overview

Key topics and technical requirements

Sample preparation and test portions: Samples must be homogenized. Test portion mass is chosen by expected chloride content:

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