This document discusses elemental analysis of foodstuff samples. It covers sample preparation techniques like homogenization, drying, and different digestion methods like dry ashing, wet ashing, and microwave-assisted digestion. It also discusses instrumentation used for elemental analysis like ICP-AES, which uses inductively coupled plasma to excite atom electrons and emit electromagnetic radiation for element detection. The document provides details on ICP-AES components and principles as well as its advantages like multi-element capabilities and disadvantages like use of expensive argon gas. It also briefly mentions other atomic spectrometry techniques like atomic absorption spectrometry, flame photometry, and ICP-MS.