A Preface
ISO (International Organization for Standardization) is a global alliance of national standards bodies (ISO member bodies). The development of international standards is usually carried out through ISO technical committees. Each member institution interested in a subject on which a technical committee has been established has the right to be represented in the committee. Government and non-governmental international organizations that liaize with standardization organizations are also involved in this work.

Draft international standards adopted by technical committees are circulated to member bodies for approval before they are accepted as international standards by the ISO Council. They are approved according to ISO procedures that require at least 75% approval by voting member institutions.

The international standard ISO 3856/1 was developed by Technical committee ISO/TC 35 (Paints and varnishes).

The third edition cancels and replaces the second edition ISO 3856/1-1983, which is a minor revision.

0 Introduction
This international standard is part of ISO 3856, Paints and varnishes – Determination of “soluble” metal content.

ISO 3856-1-1984 “Paints and varnishes – Determination of” soluble “metal content – Part 1: Determination of lead content – Flame atomic absorption spectrometry and dithizone spectrophotometric method”

Scope and field of application
This part of ISO 3856 describes two methods for determining the lead content of test solutions prepared in accordance with ISO 6713 or other appropriate international standards.

The method is suitable for “soluble” coatings with lead content in the range of approximately 0.05% to 5% (m/m).

In case of dispute, the flame atomic absorption spectroscopy (AAS) method (Article 3) shall be used as the referee method. Other methods can be used by agreement between the parties involved. If spectrophotometry is agreed, then dithiazole spectrophotometry should be used (clause 4).

2 Reference Materials
ISO 385/1, laboratory glassware burettes – Part 1: general requirements.

ISO 648, Laboratory glassware – Single label pipettes.

ISO 1042, Laboratory glassware – Single-labeled volumetric flasks.

ISO 3696, laboratory water use – Specification.

ISO 4800, Laboratory glassware – Separation funnel and drip funnel.

ISO 6713, Paints and varnishes – Preparation of acid extracts from paints in liquid or powder form.

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