SIST ISO/TR 11422:2002 PDF

Name: SIST ISO/TR 11422:2002 — Iron ores -- Recommended procedures for iron ore dissolution using either acid digestion or alkali fusion
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Iron ores -- Recommended procedures for iron ore dissolution using either acid digestion or alkali fusion

Название (английский):

SIST ISO/TR 11422:2002

Iron ores -- Recommended procedures for iron ore dissolution using either acid digestion or alkali fusion

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 29
Дата публикации:: 1 января 2002 г.
ICS:: 73.060.10
Технический комитет:: I12 - Imaginarni 12 Imaginarni TC za ISO področje - vzdrževani privzeti ISO standardi

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Описание (английский):

Recommends procedures for iron ore dissolution using either acid digestion or alkali fusion. Deals with the assessment of the advantages and disadvantages of the two procedures.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO/TR 11422:1996 is a Technical Report by ISO/TC 102 (Iron ores) that recommends laboratory procedures for dissolution of iron ores using acid digestion or alkali fusion (including sinter fusion). The report summarizes interlaboratory studies and provides practical, consolidated procedures for preparing test solutions from typical iron ore test portions (notably 2 g, 1 g and 0.5 g acid-digestion routines). It also assesses advantages and disadvantages of acid vs alkali approaches for analytical methods and trace-element determinations.

Key topics and technical requirements

Purpose: standardize sample dissolution practice for reliable chemical and trace-element analysis of iron ores.

Procedures covered:

Acid digestion methods for 2 g, 1 g and 0.5 g test portions, including reagents, apparatus and stepwise procedure.
Alkali fusion and alkali sinter fusion options, with discussion of flux-to-sample ratios and variants (including an “8‑4‑5” low-flux procedure).

Typical reagents specified: hydrochloric, nitric, sulfuric and hydrofluoric acids; sodium carbonate; sodium tetraborate. Water quality in accordance with ISO 3696 is required.

Apparatus highlights: 250 ml glass beakers, platinum crucibles, calibrated hotplate (to give 95°C and 105°C settings in specified acid depth), muffle furnace or burner.

Key procedural details (acid digestion examples):

Initial digestion covered at ~95°C (about 1 h); if residue remains, raise to ~105°C avoiding boiling.
Addition of HNO3 and small H2SO4, then evaporation to dryness and further heating for 15 min.
Filtration, drying/ashing of filter paper and residue, HF treatment to remove silica, ignition (750–800°C), fusion with Na2CO3/Na2B4O7 at ~1000°C, dissolve melt in HCl and combine with main solution to a defined volume.

Assessment points:

Alkali fusion offers one-step dissolution and avoids extensive residue treatment but raises solution salt concentrations (which can interfere with AAS/ICP techniques).
Flux-to-sample ratios are critical - the report documents lower-flux options (e.g., ~2.4:1) and higher ratios (3:1, 4:1) where acceptable.

Applications and users

Intended for metallurgical and mineral analysis laboratories, QA/QC labs in mining, geochemistry and environmental labs performing iron ore chemical and trace-element assays.

Useful for analysts establishing sample-preparation SOPs, method validation, and interlaboratory comparisons where harmonized dissolution is required.

Helps laboratories choose between acid digestion (preferred for larger test portions in trace-element work) and alkali fusion (preferred for faster one-step dissolution when matrix salts are manageable).

Related standards

Referenced in the report: ISO 9682, ISO 9683, ISO 9685, ISO 4687, ISO 1834 (sample preparation and dissolution source procedures) and ISO 3696 (water for analytical lab use).

Keywords: ISO/TR 11422, iron ore dissolution, acid digestion, alkali fusion, sinter fusion, sample preparation, analytical methods, test portion, trace element analysis.

SIST ISO/TR 11422:2002 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications and users

Related standards

Технические детали

SIST EN ISO 3696:1998

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

ISO 9682-1:1991

Iron ores — Determination of manganese content — Part 1: Flame atomic absorption spectrometric method

ISO 9683:1991

Iron ores — Determination of vanadium content — BPHA spectrophotometric method

SIST ISO 9685:1998

Iron ores -- Determination of nickel and/or chromium contents -- Flame atomic absorption spectrometric method

SIST ISO 4687-1:1998

Iron ores -- Determination of phosphorus content -- Part 1: Molybdenum blue spectrophotometric method

BS ISO 1834:1999

Short link chain for lifting purposes. General conditions of acceptance