We are offering 1-amino-2-naphthol-4-sulfonic acid ar for determination of phosphates c10h9no4s m.w. 239.25 minimum assay 98% max. Limits of impurities : sulphated ash 0.5% chloride(ci) 0.01% sensitivity to phosphate passes test cas no : 116-63-2 un no. Nr tariff : 2922 21 30 r :more...