หมายเลขมาตรฐาน : ISO 4285:1977
ชื่อเรื่อง : Phosphoric acid for industrial use — Guide to sampling techniques
Contains guides concerning the procedure to be followed and the precautions to be observed for the taking, preparation and storage of samples with the view of assess their quality. Deals with the means of delivery, containers for taking samples, technical means for mixing and heating systems. Details the sampling of thermal-process and wet-process acids from large containers and mobile tanks and the safety measures. Has also been approved by the IUPAC.
Link : https://www.iso.org/standard/10130.html
