31372152glow discharge optical emission spectrometryPT2026-03-30 20:40:22UF31372153GD-OESNDUF31372154GDOESNDUF31372155glow discharge optical emission spectroscopyNDUF31372156spectrometry, glow discharge optical emissionNDBT31341368optical emission spectroscopyPTRT31398573spectrophotometersPT