2-phosphonobutane-1,2,4-Tricarboxylic Acid

(1)Active content %:≥50.0
(2)H3PO4 ( PO43-) %:≤0.5
(3)H3PO3 ( PO33-) %:≤0.5
(4)Fe3+:≤35PPM
(5)PH(1% water solution):≤2.0
(6)Density(20 ℃)g/cm3:≥1.25