Ammonia solution 30% ar assay (acidimetric, nh3) 28.0-30.0% carbonate (as co2) max 10 ppm chloride (cl) max 0.3 ppm nitrate (no3) max 2 ppm phosphate (po4) max 0.5 ppm heavy metals (as pb) max 0.5 ppm silicon (as sio2) max 5 ppm sulphate (so4) max 2 ppm sulphide (s) max 0.2 ppm cas no : 1336-21-6 un no : 82672 hs code : 2814 20 00 r : 34-50 s : 26-363739-45-61 f :