AS/NZS 1580.501.1:1994

1 - AS/NZS 1580.501.1:1994 PAINTS AND RELATED MATERIALS-METHODS OF TEST - SOLUBLE LEAD CONTENT
1 - PREFACE
2 - 0 Introduction
2 - 1 Scope and field of application
2 - 2 References
2 - 3 Flame atomic absorption spectrometric method
2 - 3.1 Principle
2 - 3.2 Reagents and materials
2 - 3.2.1 Hydrochloric acid
2 - 3.2.2 Acetylene
2 - 3.2.3 Compressed air.
3 - 3.2.4 Lead, standard solution containing 1 g of Pb per litre
3 - 3.2.5 Lead, standard solution containing 100 mg of Pb per litre
3 - 3.3 Apparatus
3 - 3.3.1 Flame atomic absorption spectrometer
3 - 3.3.2 Lead hollow-cathode lamp or lead discharge lamp.
3 - 3.3.3 Burette
3 - 3.3.4 One-mark volumetric flasks
3 - 3.4 Procedure
3 - 3.4.1 Preparation of the calibration graph
3 - 3.4.2 Test solutions
4 - 3.4.3 Determination
4 - 3.5 Expression of results
4 - 3.5.1 Calculations
4 - 3.5.1.1 Pigment portion of the liquid paint
4 - 3.5.1.2 Liquid portion of the paint
4 - 3.5.1.3 Liquid paint
4 - 3.5.1.4 Paint in powder form
4 - 3.5.1.5 Other test solutions
4 - 3.5.2 Precision
5 - 4 Dithizone spectrophotometric method
5 - 4.1. Principle
5 - 4.2 Reagents
5 - 4.2.1 Hydrochloric acid
5 - 4.2.2 Buffer solution.
5 - 4.2.3 Hydroxylammonium chloride
5 - 4.2.4 1,1,1-trichloroethane
5 - 4.2.5 Dithizone, stock solution.
5 - 4.2.6 Dithizone, working solution.
5 - 4.2.7 Lead, standard stock solution containing 1 g of Pb per litre
5 - 4.2.8 Lead, standard solution containing 10 mg of Pb per litre
5 - 4.3 Apparatus
5 - 4.3.1 Spectrophotometer
5 - 4.3.2 Separating funnels
5 - 4.3.3 Pipette
5 - 4.3.4 Burette
5 - 4.3.5 One-mark volumetric flasks
5 - 4.4 Procedure
5 - 4.4.1 Preparation of the calibration graph
6 - 4.4.2 Test solutions
6 - 4.4.3 Determination
6 - 4.5 Expression of results
6 - 4.5.1 Calculations
6 - 4.5.1.1 Pigment portion of the liquid paint
6 - 4.5.1.2 Liquid portion of the paint
7 - 4.5.1.3 Liquid paint
7 - 4.5.1.4 Paint in powder form
7 - 4.5.1.5 Other test solutions
7 - 4.5.2 Precision
7 - 5 Test report

Provides two methods for the determining of lead content in test solutions.

This part of ISO 3856 describes two methods for the determination of the lead content of the test solutions, prepared according to ISO 6713 or other suitable International Standards.The methods are applicable to paints having "soluble" lead contents in the range of about 0,05 to 5% (m/m).The flame atomic absorption spectrometric (AAS) method (clause 3) should be used as the referee method in cases of dispute. Other methods can be used by agreement between the interested parties. If a spectrophotometric method is agreed, the dithizone spectrophotometric method (clause 4) should be used.

First published as AS K41.501.1-1959.
Revised and redesignated AS 1580.501.1-1980.
Jointly revised and redesignated as Joint Standard AS/NZS 1580.501.1:1994.