Powders: Grinding (<400 mesh if possible) can minimise scatter affects due to particle size. Additionally, grinding insures that the measurement is more representative of the entire sample, vs. the surface of the sample. Pressing (hydraulically or manually) compacts more of the sample into the analysis area, and ensures uniform density and better reproducibility..Solids:Orient surface patterns in same manner so as minimise scatter affects.Polishing surfaces will also minimise scatter affects.Flat samples are optimal for quantitative results.Liquids: Samples should be fresh when analysed and analysed with short analysis time - if sample is evaporative. Sample should not stratify during analysis. Sample should not contain precipitants/solids, analysis could show settling trends with time.
การแปล กรุณารอสักครู่..