This article provides an introduction to the various chemical techniques used for contamination analysis in metals and plants. Contamination analysis is crucial for identifying and quantifying pollutants in these samples, as it helps in assessing the potential risks to human health and the environment. The common contaminants found in metals and plants are discussed, highlighting the need for accurate and sensitive analytical methods. The article then delves into the sample preparation techniques required for successful contamination analysis, emphasizing the importance of proper sample handling and processing. The article further explores three main spectroscopic techniques used for metal contamination analysis: atomic absorption spectroscopy, inductively coupled plasma mass spectrometry, and X-ray fluorescence spectroscopy. These techniques offer precise and reliable measurements of metal concentrations in samples. For plant contamination analysis, gas chromatography-mass spectrometry and high-performance liquid chromatography are discussed. These techniques allow for the detection and quantification of various organic contaminants in plants. Lastly, Fourier transform infrared spectroscopy is presented as a powerful tool for plant contamination analysis, as it provides information about the chemical composition and structure of contaminants. Overall, this article highlights the significance of contamination analysis and provides an overview of the different chemical techniques utilized in this field for both metals and plants.