ISO 3139:1976

Name: ISO 3139:1976 — Aqueous hydrofluoric acid for industrial use — Sampling and methods of test
SKU: ISO 3139:1976
Price: 7200 RUB
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Aqueous hydrofluoric acid for industrial use — Sampling and methods of test

Название (английский):

ISO 3139:1976

Aqueous hydrofluoric acid for industrial use — Sampling and methods of test

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 4
Дата публикации:: 1 апреля 1976 г.
Издание:: ISO IS 3139 edition 1 version 1
ICS:: 71.060.30

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Описание (английский):

Contains also titrimetric methods for determination of the total acidity, the hexafluorosilicic acid content and the non-volatile acids content and a method for calculating the hydrogen fluoric content. Specifies the scope and the field of application of these methods and declares the principle of the procedures. This second edition results from the incorporation of Addendum in the first one. Cancels and replaces the first edition ISO 3139/1974.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview - ISO 3139:1976 (Aqueous hydrofluoric acid - Sampling & methods of test)

ISO 3139:1976 specifies standardized procedures for sampling and chemical testing of aqueous hydrofluoric acid (HF) for industrial use. The standard covers safe sample preparation and a set of titrimetric methods to determine: total acidity, hexafluorosilicic acid (H2SiF6) content, non‑volatile acids content, and a calculation method to derive the hydrogen fluoride (HF) content from those determinations. The edition consolidates an earlier addendum and applies to industrial HF solutions in the typical commercial range (about 40–85% mass).

Key topics and technical requirements

Scope and application: Laboratory titrimetric methods for industrial HF solutions; method applicability ranges are specified (for example, H2SiF6 typically 0.2–10% mass; non‑volatile acids 0.025–5% mass).

Sampling & sample preparation: Use polyolefin sample bottles (150 ml capacity), dilution and cooling of hazardous samples, and use of ice/water mixtures to prepare test samples. Samples must be handled under a fume hood.

Titrimetric procedures:

Determination of total acidity and hexafluorosilicic acid: a two‑stage titration - a cold titration (in presence of KNO3 and phenolphthalein) followed by a hot titration; uses standardized NaOH titrants (1 N and 0.1 N are referenced).
Determination of non‑volatile acids: evaporation to remove volatile acids, then titration at 100 °C with 0.1 N NaOH using phenolphthalein.

Calculation of HF content: HF mass percent is calculated from measured values using the formula:

HF = a − 0.833·b − 0.408·c
- where a = total acidity (% mass HF), b = H2SiF6 (% mass), c = non‑volatile acids (% mass as H2SO4).

Reagents and apparatus: Specifies analytical‑grade reagents (distilled water, KNO3, NaOH titrants, phenolphthalein), common lab glassware/containers (polyolefin, PTFE), and platinum capsules for evaporation steps.

Safety: Emphasizes HF hazards - extreme corrosivity, glass attack, severe skin/eye burns - and mandates PPE and fume hood use.

Practical applications and users

Chemical producers and refineries that manufacture or distribute industrial HF

Quality control and analytical laboratories performing routine compositional analysis

Materials suppliers and downstream users (fluorination, etching, metal treatment industries) who require verified HF composition

Regulatory and safety auditors assessing compliance with handling and testing procedures

Benefits include consistent test results, safer handling practices for hazardous samples, and a reliable basis for product specification and quality control.

Related standards

Relevant ISO documents (annex) include:

ISO 3137 (anhydrous HF sampling)

ISO 3138 (non‑volatile acids titration)

ISO 3699 / 3700 (water determination: Karl Fischer, conductimetric)

ISO 3701 (H2SiF6 photometric method)

ISO 3702 (SO2 determination)

Keywords: ISO 3139, aqueous hydrofluoric acid, sampling, methods of test, titrimetric methods, total acidity, hexafluorosilicic acid, non‑volatile acids, hydrogen fluoride content, HF analysis.

ISO 3139:1976

Abstract

Похожие стандарты

Overview - ISO 3139:1976 (Aqueous hydrofluoric acid - Sampling & methods of test)

Key topics and technical requirements

Practical applications and users

Related standards

Технические детали

ISO 3137:1974

Anhydrous hydrogen fluoride for industrial use — Sampling

ISO 3138:1974

Anhydrous hydrogen fluoride for industrial use — Determination of non-volatile acid content — Titrimetric met…

ISO 3699:1976

Anhydrous hydrogen fluoride for industrial use — Determination of water content — Karl Fischer method

ISO 3701:1976

Anhydrous hydrogen fluoride for industrial use — Determination of hexafluorosilicic acid content — Reduced mo…

ISO 3702:1976

Anhydrous hydrogen fluoride for industrial use — Determination of sulphur dioxide content — Iodometric method