... metal chelate Neutral Mark,or OEM Product Name: DTPA-FE-7 Chemical name: Diethylenetriaminepentaacetic acid, ferric disodium complex Specification: Appearance: Yellow ... stable water-soluble metal chelate Iron chelated : 7% PH value(1% of water solution) : 5.0-7.0 Solubility in water : approx.400g/l ...