Na2edta 2h2o

Preparation of Fe(III) EDTA Solution: A 100 mM Fe(III) EDTA solution was prepared with equal molar Na₂EDTA and FeCl₃·6H₂O.
Preparation of Fe(II) EDTA Solution: A 30 mM Fe(II) EDTA solution was prepared with equal molar Na₂EDTA and FeSO₄·7H₂O.
Preparation of Fe(II) EDTA-NO Solution: A 30 mM Fe(II) EDTA solution was equally transferred into two absorption bottles, and N₂ was used as protective gas to pass into NO gas to saturate the solution. The concentration of Fe(II) EDTA-NO was determined before use.
Na₂EDTA·2H₂O (99%), FeCl₃·6H₂O (99%), D-glucose (99.5%) and other chemicals were applied in analytical reagent grade without further purification, which were purchased from Sinopharm Chemical Reagent Co. (Shanghai, China). The compositions of simulated flue gas were supplied by Zhejiang Jingong Gas Co. (Hangzhou, China): N₂ (99.999%), CO₂ (99.999%), O₂ (99.999%), and NO (5 vol% in N₂).

Na₂EDTA·2H₂O (99%), FeSO₄(NH₄)₂SO₄·6H₂O (99.5%), FeCl₃·6H₂O (99%), and D-glucose (99.5%) were acquired from Sinopharm Chemical Reagent Co. (Shanghai, China). NO (5% in N₂, v/v), N₂ (99.999%), CO₂ (99.999%) and O₂ (99.999%) were provided by Zhejiang Jingong Gas Co. (Hangzhou, China). All other chemicals are analytical-reagent grade, commercially available and used without further purification.