“…This Special issue shows studies related to copper ( Belbachir et al, 2022 , Stala et al, 2022 ), mercury ( Windisch et al, 2022 ), arsenic ( Jakukowicz-Sobala et al, 2022 ; Zaric et al, 2022 ; Carneiro et al, 2022 ), selenium (Parra-Martinez et al, 2022; Arias - Borrego et al, 2022 ), and other heavy and radioactive metals ( Irfan et al, 2022 ; Zheng et al, 2022; Germande et al, 2022 ; Krawczy-Barsch et al, 2022) detection and speciation, organic matter and inorganic ions removal ( Pidoux et al,. 2022 ), quantitative analysis of metabolites ( Wang et al, 2022 ), estrogens ( Zdarta et al, 2022 ), uses and detection of nanomaterials ( Kuo et al, 2022 , Saravanakumar et al, 2022 ), nanoplastics ( Arini et al, 2022 ), HCH derivatives ( Alvarez et al, 2022 ), antibiotics ( Zaheer Afzal et al, 2022 ), pesticides ( Jevremovic et al, 2022 ), photodegration processes ( Kumar et al, 2022 ), cell internalization drugs ( Ahmadi et al, 2022 ), dyes and pigments degradation ( Jankowska et al, 2022 ), and bacteria studies ( Arruda et al, 2022 , Xiang et al, 2022 ) in a very long different group of samples, including fresh environmental water, seawater, wastewater, different soils, food, marine organism, bacteria, mice’s, etc.…”