GB/Z 43032 - 2023 focuses on the field of nanotechnology, aiming at sample preparation for the characterization of metal and metal oxide nanomaterials in water samples. It details all aspects from water sample collection, transportation and preservation to pretreatment, including how to avoid agglomeration, sedimentation and pollution of nanomaterials. Clarify the processing methods of water samples with different concentrations and properties, such as filtrate, centrifugation and other operation points. By standardizing the preparatory process, ensure that the obtained samples can truly reflect the state of nanomaterials in water samples, and lay the foundation for subsequent accurate characterization of their size, morphology, composition and other characteristics, and facilitate the research and application of nanotechnology in the field of environment monitoring.