National foreword<br>National Annex NA (informative) - Bibliography<br>Foreword<br>Introduction<br>1 Scope<br>2 Normative references<br>3 Description<br>4 Purity criteria<br>5 Test methods<br>6 Labelling - Transportation - Storage<br>Annex A (informative) - General information on<br> polycarboxylic acids and salts<br>Annex B (normative) - Analytical methods for<br> polycarboxylic acids and salts<br>Annex C (informative) - Environmental, health<br> and safety precautions within chemical laboratory<br>Bibliography