Mapping of Selenium toxicity and technological advances for its removal: A Scentiometric approach -- Selenium Distribution and Chemistry in Water and Soil -- Occurrence and Sources of Selenium Contamination in Soil and Water and Its Impacts on Environment -- Selenium Toxicity in Domestic Animals: Sources, Toxicopathology and Control Measure -- Positive and negative impacts of selenium on human health and phytotoxicity -- Various analytical techniques for Se determination in different matrix -- Voltammetric Sensors and Materials for Selenium detection in Water -- Optical Sensors and Materials for Selenium Determination in Water -- Biosensors for the detection of selenium in environment -- Physical and Chemical Methods for Selenium Removal -- Chemical method for removal and treatment -- Biological treatment advancements for the remediation of selenium from wastewater -- Nanomaterials for the Remediation of Selenium in water -- Harnessing Biogeochemical Principals for Remediation of Selenium Contaminated Soils -- Membrane separation technologies for selenium -- Intensifying approaches for removal of selenium -- Emerging threat of selenium pollution: a spatial analysis of its sources and vulnerable areas in India