AS/NZS 1580.501.2:1994

1 - AS/NZS 1580.501.2:1994 PAINTS AND RELATED MATERIALS-METHODS OF TEST - PREPARATION OF ACID EXTRACTS
1 - PREFACE
2 - METHOD
2 - 0 Introduction
2 - 1 Scope and field of application
2 - 2 References
2 - 3 Definitions
2 - 3.1 pigment
2 - 3.2 "soluble" metal content of liquid paint
2 - 3.3 "soluble" metal content of paint in powder form
2 - 4 Principle
3 - 5 Sampling
3 - 6 Separation of the pigment from the liquid paint sample
3 - 6.1 Preparation of the test sample
3 - 6.2 Reagents
3 - 6.3 Apparatus
3 - 6.3.1 Suitable laboratory centrifuge
3 - 6.3.2 Air-ventilated oven
3 - 6.3.3 Stoppered glass container
3 - 6.4 Procedure
3 - 6.4.1 Method A
4 - 6.4.2 Method B
4 - 6.4.3 Method C
4 - 6.5 Blank test solution
4 - 7 Treatment of paints in powder form
4 - 8 Acid extraction of the separated pigment and of paints in powder form
4 - 8.1 Treatment of the separated pigment
4 - 8.2 Method for the acid extraction of ”soluble” metals
4 - 8.2.1 Reagents
4 - 8.2.2 Apparatus
4 - 8.2.3 Procedure
5 - 8.3 Method for the acid extraction of ”soluble” lead
5 - 8.3.1 Preliminary determination of total lead
5 - 8.3.1.1 Principle
5 - 8.3.1.2 Reagents
5 - 8.3.1.3 Apparatus
5 - 8.3.1.4 Procedure
6 - 8.3.1.5 Calculation
6 - 8.3.2 Extraction procedure
6 - 8.3.2.1 Calculation of mass of test portion
6 - 8.3.2.2 Reagents
6 - 8.3.2.3 Apparatus
6 - 8.3.2.4 Procedure
6 - 8.4 Blank test solution
6 - 9 Treatment of the extracted liquid portion
6 - 9.1 Reagents
6 - 9.1.1 Nitric acid 1 + 1.
7 - 9.1.2 Hydrochloric acid diluted
7 - 9.2 Apparatus
7 - 9.2.1 Water-bath.
7 - 9.2.2 Hot-plate.
7 - 9.2.3 Muffle furnace
7 - 9.2.4 One-mark volumetric flask
7 - 9.3 Procedure

Provides a method for the preparation of acid extracts required as test solutions for the determination of the soluble metal content of paints and related materials.

This International Standard describes methods for the preparation of acid extracts required as the test solutions for the determination of the "soluble" metal contents of paints and related products in liquid or powder form.The acid extracts are prepared in 0.07 mol/l hydrochloric acid, which is chosen as an approximation of the acid in the stomach.This International Standard is not applicable to dried or comminuted paint films (see ISO 6714).WARNING - The procedures described in this International Standard are intricate and, therefore, should be carried out by those who are properly experienced in these analytical procedures. Adequate precision will only be obtained if all the details of the separation and extraction procedures are strictly observed.

First published as Joint Standard AS/NZS 1580.501.2:1994.