Quality control homogenisation

This book attempts to cover chemical and ecotoxicological analysis related to routine contaminated land investigations. It does not cover analysis related to research or specialist one-off project type investigations. The following chapter deals with soil analysis method requirements, how methods should be validated and the need for all methods to meet clearly defined performance requirements. It also covers quality assurance/quality control aspects. Chapter 3 covers the key, and problematic area of sample homogenisation and the initial sample preparation. Chapter 4 covers the analysis of metals and elemental... 

In the presence of gaseous oxygen, pure or diluted with nitrogen or other inert gases, aluminium is very stable at a wide range of temperatures. As a consequence, alloys are fused and elaborated under the natural atmosphere of the casthouse. Heat treatments are normally carried out in furnaces under air up to temperatures in the order of 600 °C for durations of up to 24 hours in the case of homogenisation treatments. Heat treatment practices using controlled atmosphere are reserved for cases where very specific quality requirements must be met. 

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