GB/T 4 2658.4 - 2023 focuses on the relevant links of nano-objects in surface chemical analysis. This part is the fourth part of the Sample Handling and other guidelines, focusing on the standardized reporting of the origin, preparation, treatment and installation information of nano-objects before surface analysis. It clarifies the main points of information recording, ensures that the pre-analysis state of nano-objects is clear and traceable, and provides protection for the accuracy and Repeatability of subsequent surface analysis. It is of great significance to promote the research and application of nano-objects in the field of surface chemical analysis.