UNE 55574:1981 SURFACE ACTIVE AGENTS. SULPHUR FOR USE AS RAW-MATERIAL IN DETERGENT FORMULATIONS. DETERMINATION OF ARSENIC CONTENT. SILVER DIETHYLDITHIOCARBAMATE PHOTOMETRIC METHOD
1981UNE 55574:1981 SURFACE ACTIVE AGENTS. SULPHUR FOR USE AS RAW-MATERIAL IN DETERGENT FORMULATIONS. DETERMINATION OF ARSENIC CONTENT. SILVER DIETHYLDITHIOCARBAMATE PHOTOMETRIC METHOD