ISO 3856-7:1984 PDF

Paints and varnishes — Determination of "soluble" metal content — Part 7: Determination of mercury content of the pigment portion of the paint and of the liquid portion of water-dilutable paints — Flameless atomic absorption spectrometric method

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Title (English):

ISO 3856-7:1984

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 8
Publication date:: December 1, 1984
Edition:: ISO IS 3856 edition 1 version 1
ICS:: 87.040

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Description (English):

The principle consists in oxidation of the of hte mercury compounds contained in the test solution obtained from the pigment portion of the paint or combustion with oxygen in an enclosed system of the evaporation residue of the test solution obtained from the liquid portion of water-dilutable paints. Reduction of the mercury(II) compounds to elementary mercury. Determination of the mercury, as the monoatomic vapour, by cold vapour (flameless) atomic absorption spectrometry at a wavelength in the region of 253,7 nm. The method is applicable to coating materials having "soluble" mercury contents in the range of about 0,005 % (m/m) to 0,05 % (m/m).

Technical details

Technical committee: ISO/TC 256 - Pigments, dyestuffs and extenders
SKU: ISO 3856-7:1984

Abstract

Overview

ISO 3856-7:1984 - Paints and varnishes - Determination of “soluble” metal content - Part 7 specifies a flameless (cold vapour) atomic absorption spectrometric method for measuring mercury in paint test solutions. The method covers the pigment portion of paints (including powder form) and the liquid portion of water-dilutable paints. The analytical range is approximately 0.005 % (m/m) to 0.05 % (m/m) soluble mercury.

The principle: oxidize or combust mercury compounds to convert mercury to Hg(II), chemically reduce to elemental mercury, entrain mercury vapour in a carrier gas and measure the monoatomic vapour by cold vapour atomic absorption at about 253.7 nm.

Key topics and technical requirements

Sample types: pigment portion (acid extracts) and liquid portion from water-dilutable paints.
Sample preparation: acid extraction (referenced to ISO 6713), oxidation (e.g., potassium permanganate), and combustion of residue for liquid-phase concentrates.
Detection principle: reduction of Hg(II) to elemental mercury and measurement by cold vapour atomic absorption spectrometry (CV-AAS) at ~253.7 nm.
Analytical range: suitable for soluble mercury contents ≈ 0.005–0.05 % (m/m).
Reagents and materials (examples from the method): sulfuric and nitric acids, potassium permanganate, tin(II) chloride reducing agent, hydroxylammonium chloride, mercury standard solutions.
Apparatus: atomic absorption spectrometer with mercury cold-vapour cell, quartz measuring cell (≥100 mm path), combustion flask, rotary evaporator, flowmeter and pump, and spark generator for sample ignition.
Calibration & quality control: prepare standard matching solutions on day of use; plot peak height/area vs. mass of Hg; include blank determinations and duplicate analyses.
Safety: mercury and certain reagents are toxic/corrosive - perform work in a well-ventilated fume cupboard and follow laboratory safety rules.

Practical applications

Routine quality control for paint and varnish manufacturers to monitor soluble mercury in pigments and formulations.
Independent analytical and environmental laboratories assessing mercury content in coatings for regulatory compliance.
Product safety assessment and formulation development where control of heavy metals is required (consumer, architectural, industrial coatings).

Who should use this standard

Analytical chemists in coatings laboratories
QA/QC teams in paint manufacturing
Environmental testing services and regulatory bodies overseeing heavy-metal limits in coatings

Related standards

ISO 6713 - Paints and varnishes: preparation of acid extracts from paints
ISO 3696 - Water for laboratory use (purity grades)
Other parts of ISO 3856 - Determination of “soluble” metal content in paints and varnishes

Keywords: ISO 3856-7:1984, paints and varnishes, mercury determination, cold vapour AAS, flameless atomic absorption, soluble metal content, pigment analysis, water-dilutable paints.

Related standards

Standards mentioned in the description

Abstract

Overview

Key topics and technical requirements

Sample types: pigment portion (acid extracts) and liquid portion from water-dilutable paints.
Sample preparation: acid extraction (referenced to ISO 6713), oxidation (e.g., potassium permanganate), and combustion of residue for liquid-phase concentrates.
Detection principle: reduction of Hg(II) to elemental mercury and measurement by cold vapour atomic absorption spectrometry (CV-AAS) at ~253.7 nm.
Analytical range: suitable for soluble mercury contents ≈ 0.005–0.05 % (m/m).
Reagents and materials (examples from the method): sulfuric and nitric acids, potassium permanganate, tin(II) chloride reducing agent, hydroxylammonium chloride, mercury standard solutions.
Apparatus: atomic absorption spectrometer with mercury cold-vapour cell, quartz measuring cell (≥100 mm path), combustion flask, rotary evaporator, flowmeter and pump, and spark generator for sample ignition.
Calibration & quality control: prepare standard matching solutions on day of use; plot peak height/area vs. mass of Hg; include blank determinations and duplicate analyses.
Safety: mercury and certain reagents are toxic/corrosive - perform work in a well-ventilated fume cupboard and follow laboratory safety rules.

Practical applications

Routine quality control for paint and varnish manufacturers to monitor soluble mercury in pigments and formulations.
Independent analytical and environmental laboratories assessing mercury content in coatings for regulatory compliance.
Product safety assessment and formulation development where control of heavy metals is required (consumer, architectural, industrial coatings).

Who should use this standard

Analytical chemists in coatings laboratories
QA/QC teams in paint manufacturing
Environmental testing services and regulatory bodies overseeing heavy-metal limits in coatings

Related standards

ISO 6713 - Paints and varnishes: preparation of acid extracts from paints
ISO 3696 - Water for laboratory use (purity grades)
Other parts of ISO 3856 - Determination of “soluble” metal content in paints and varnishes

Keywords: ISO 3856-7:1984, paints and varnishes, mercury determination, cold vapour AAS, flameless atomic absorption, soluble metal content, pigment analysis, water-dilutable paints.

ISO 3856-7:1984 PDF

Technical details

Abstract

Overview

Key topics and technical requirements

Practical applications

Who should use this standard

Related standards

Related standards

Abstract

Overview

Key topics and technical requirements

Practical applications

Who should use this standard

Related standards

Related standards

Paints and varnishes — Preparation of acid extracts from liquid paints

Water for analytical laboratory use. Specification and test methods.

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