ISO 6129:1981

Chromium ores - Determination of hygroscopic moisture content in analytical samples - Gravimetric method

The method is intended to be carried out simultaneously with the determination of other constituents of the same analytical sample so that the contents of the other constituents can be calculated on the basis of the absolutely dry ore. ISO 6129 should be read in conjunction with ISO 6629.

Minerais de chrome — Détermination de l'humidité des échantillons pour analyse — Méthode gravimétrique

Kromove rude - Določevanje higroskopske vlage v analitskem vzorcu - Gravimetrijska metoda

General Information

• Status: Published
• Publication Date: 30-Apr-1981
• ICS: 73.060.30 - Chromium ores
• Technical Committee: ISO/TC 132 - Ferroalloys
• Drafting Committee: ISO/TC 132 - Ferroalloys
• Current Stage: 9093 - International Standard confirmed
• Start Date: 25-Mar-2022
• Completion Date: 13-Dec-2025
• Ref Project: SIST ISO 6129:2001 - Chromium ores -- Determination of hygroscopic moisture content in analytical samples -- Gravimetric method

Overview

ISO 6129:1981 specifies a gravimetric method for determining the hygroscopic moisture content of analytical samples of chromium ores. The method is intended to be performed together with other chemical determinations on the same analytical sample so that results for other constituents can be reported on an absolutely dry basis. ISO 6129 is intended to be read in conjunction with ISO 6629 (general instructions for chemical analysis of chromium ores).

Key topics and requirements

• Scope: Determination of hygroscopic (surface) moisture in analytical samples of chromium ores using oven drying and gravimetric weighing.
• Sample preparation: Use a test sample crushed to a particle size not exceeding 0.10 mm and air‑dried under laboratory conditions.
• Test portion: 5 g of the prepared sample is weighed into a pre‑dried weighing bottle with stopper (bottle diameter not less than 5 cm).
• Drying conditions: Place the open weighing bottle in an oven controlled at 105–110 °C. Initial drying is 1 hour, followed by cooling in a desiccator for 20–30 minutes, then weighing.
• Repeat drying cycles: Continue drying (typically 30 min cycles), cooling and weighing until the difference between two successive masses is ≤ 0.0005 g. If mass increases after repeated drying, accept the preceding mass.
• Calculation: Hygroscopic moisture content (%) is calculated gravimetrically by comparing bottle+sample masses before and after drying. Using the standard notation:
  • ml = mass of weighing bottle + sample + stopper before drying
  • m2 = mass of weighing bottle + sample + stopper after drying
  • m1 = mass of the test portion
  • Hygroscopic moisture (%) = (ml − m2) / m1 × 100
• Quality control: The standard provides permissible tolerances for duplicate determinations depending on the moisture content range.

Applications and who uses it

ISO 6129 is used by:

• Laboratory analysts and assayers conducting chemical analysis of chromium ores and concentrates
• Mining companies and QA/QC teams verifying ore moisture for reporting and process control
• Metallurgical laboratories and buyers/sellers requiring moisture-corrected compositional data Practical uses include converting analytical results to an absolutely dry basis, ensuring consistency in chemical assays, and establishing moisture figures for contract and process specifications.

Related standards

• ISO 6629 - Chromium ores and concentrates - Methods of chemical analysis: General instructions (read in conjunction with ISO 6129)

Keywords: ISO 6129, chromium ores, hygroscopic moisture, gravimetric method, moisture determination, oven drying, analytical samples, ISO 6629.

Standards Content (Sample)

SLOVENSKI STANDARD
01-junij-2001
.URPRYHUXGH'RORþHYDQMHKLJURVNRSVNHYODJHYDQDOLWVNHPY]RUFX
*UDYLPHWULMVNDPHWRGD
Chromium ores -- Determination of hygroscopic moisture content in analytical samples --
Gravimetric method
Minerais de chrome -- Détermination de l'humidité des échantillons pour analyse --
Méthode gravimétrique
Ta slovenski standard je istoveten z: ISO 6129:1981
ICS:
73.060.30 Kromove rude Chromium ores
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

International Standard
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION.MEXflYHAPOfiHAR OPI-AHM3AWlfl I-IO CTAH~APT~3AI_1MM~ORGANISATION INTERNATIONALE DE NORMALISATION
Chromium ores -
Determination of hygroscopic moisture
content in analytical samples - Gravimetric method
Determination de l’humiditb des bchantilfons pour analyse - Mhthode gravimktrique
Minerals de chrome -
First edition - 1981-05-15
UDC 553.32: li43.717
Ref. Ns. ISO6129-1981 (EI
Descriptors : chromate minerals, tests, determination, water, gravimetric analysis.
Price based on 1 page
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of
national Standards institutes (ISO member bodies). The work of developing Inter-
national Standards is carried out through ISO technical committees. Every member
body interested in a subject for which a technical committee has been set up has the
right to be represented on that committee. International organizations, governmental
and non-governmental, in liaison with ISO, also take part in the work.
Draft International Standards adopted by the technical committees are circulated to
the member bodies for approval before their acceptance as International Standards by
the ISO Council.
International Standard ISO 6129 was developed by Technical Committee ISO/TC 65,
Manganese and chromium ores, and was circulated to the member bodies in
February 1980.
lt has been approved by the member bodies of the following countries :
Australia
Hungary Portugal
Austria India
Romania
Bulgaria I reland South Africa, Rep. of
China Italy United Kingdom
Czechoslovakia Japan USSR
Egypt, Arab Rep. of Korea, Dem. P. Rep. of
France Poland
No member body expressed disapproval of the document.
0 International Organkation for Standardkation, 1981
Printed in Switzerland
ISO 6129-1981 (E)
INTERNATIONAL STANDARD
Chromiu
...

International Standard
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION.MEXflYHAPOfiHAR OPI-AHM3AWlfl I-IO CTAH~APT~3AI_1MM~ORGANISATION INTERNATIONALE DE NORMALISATION
Chromium ores -
Determination of hygroscopic moisture
content in analytical samples - Gravimetric method
Determination de l’humiditb des bchantilfons pour analyse - Mhthode gravimktrique
Minerals de chrome -
First edition - 1981-05-15
UDC 553.32: li43.717
Ref. Ns. ISO6129-1981 (EI
Descriptors : chromate minerals, tests, determination, water, gravimetric analysis.
Price based on 1 page
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of
national Standards institutes (ISO member bodies). The work of developing Inter-
national Standards is carried out through ISO technical committees. Every member
body interested in a subject for which a technical committee has been set up has the
right to be represented on that committee. International organizations, governmental
and non-governmental, in liaison with ISO, also take part in the work.
Draft International Standards adopted by the technical committees are circulated to
the member bodies for approval before their acceptance as International Standards by
the ISO Council.
International Standard ISO 6129 was developed by Technical Committee ISO/TC 65,
Manganese and chromium ores, and was circulated to the member bodies in
February 1980.
lt has been approved by the member bodies of the following countries :
Australia
Hungary Portugal
Austria India
Romania
Bulgaria I reland South Africa, Rep. of
China Italy United Kingdom
Czechoslovakia Japan USSR
Egypt, Arab Rep. of Korea, Dem. P. Rep. of
France Poland
No member body expressed disapproval of the document.
0 International Organkation for Standardkation, 1981
Printed in Switzerland
ISO 6129-1981 (E)
INTERNATIONAL STANDARD
Chromium ores - Determination of hygroscopic moisture
content in analytical samples - Gravimetric method
6.2 Determination
1 Scope and field of application
Place the open weighing bottle containing the test Portion (6.1)
This International Standard specifies a method for the deter-
in the oven (4.21, controlled at 105 to 110 OC. After 1 h, close
mination of the hygroscopic moisture content in analytical
intended to be carried out t
...

Norme internationale
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION.ME~YHAPOJIHAR OPrAHM3Aî@lR l-l0 CTAH~APTbl3ALWlM@ORGANISATION INTERNATIONALE DE NORMALISATION
Détermination de l’humidité des
Minerais de chrome -
échantillons pour analyse - Méthode gravimétrique
Chromium ores - Determination of h ygroscopic moisture content in analytical samples - Gravimetric method
Première édition - 1981-05-15
CDU 553.32 : 543.717 Réf. no : ISO 61294981 (F)
Descripteurs : minerai de chrome, essai, détermination, eau, méthode gravimétrique.
Prix basé sur 1 page
Avant-propos
L’ISO (Organisation internationale de normalisation) est une fédération mondiale
d’organismes nationaux de normalisation (comités membres de I’ISO). L’élaboration
des Normes internationales est confiée aux comités techniques de I’ISO. Chaque
comité membre intéressé par une étude a le droit de faire partie du comité technique
correspondant. Les organisations internationales, gouvernementales et non gouverne-
mentales, en liaison avec I’ISO, participent également aux travaux.
Les projets de Normes internationales adoptés par les comités techniques sont soumis
aux comités membres pour approbation, avant leur acceptation comme Normes inter-
nationales par le Conseil de I’ISO.
La norme internationale ISO 6129 a été élaborée par le comité technique ISO/TC 65,
Minerais de manganèse et de chrome, et a été soumise aux comités membres en février
-
1980.
Les comités membres des pays suivants l’ont approuvée :
Afrique du Sud, Rép. d’ France Portugal
Australie Hongrie
Roumanie
Autriche Inde Royaume-Uni
Bulgarie Irlande Tchécoslovaquie
Chine Italie
URSS
Corée, Rép. dém. p. de Japon
Égypte, Rép. arabe d’
Pologne
Aucun comité membre ne l’a désapprouvée.
C3 Organisation internationale de normalisation, 1981 0
Imprimé en Suisse
ISO 6129-1981 (F)
NORME INTERNATIONALE
Minerais de chrome - Détermination de l’humidité des
échantillons pour analyse - Méthode gravimétrique
6.2 Détermination
1 Objet et domaine d’application
Mettre le vase à peser (et son couvercle) contenant la prise
La présente Norme internationale spécifie une méthode de
d’essai (6.1) dans l’étuve (4.2) maintenue à une température de
détermination de l’humidité des échantillons de minerais de
chrome pour analyse, à effectuer simultanément au dosage 105 à 110 OC, le vase étant ouvert. Après 1 h, fermer le vase à
peser avec son couv
...