亚硝酰亚铁螯合物(Ⅲ)Fe~Ⅱ(EDTMP)(NO)与亚硫酸钠的反应动力学研究

CIESC Journal

亚硝酰亚铁螯合物(Ⅲ)Fe~Ⅱ(EDTMP)(NO)与亚硫酸钠的反应动力学研究

邓援建,庄亚辉

中国科学院生态环境研究中心,中国科学院生态环境研究中心北京 ,北京

出版日期:1988-08-25 发布日期:1988-08-25

Nitrosyl Ferrous Chelates(Ⅲ) Kinetics of the Reaction Between Fe~Ⅱ (EDTMP) (NO) and Sodium Sulfite

Deng Yuanjian and Zhuang Yahui (Research Center for Eco-environmental Sciences, Academia Sinica, Beijng)

Online:1988-08-25 Published:1988-08-25

摘要/Abstract

摘要： 本文用快速混合法研究了水溶液中乙二胺四甲叉膦酸根亚硝酰铁(Ⅱ)与亚硫酸钠之间的反应动力学.在pH=5.88和离子强度0.3mol/1的条件下,上述反应为二级反应.测得20,25,30和35℃时的反应速率常数k分别为1.95,3.03,5.48和7.05 1/mol·min,表观反应活化能为68.6kJ/mol,比FeⅡ(EDTA)(NO)体系的活化能要小.讨论了溶液酸度对k的影响.

Abstract: The rate of reaction between nitrosyl ferrous ethylenediaminetetramethy-lenephosphonate and sodium sulfite in aqueous solutions was measured spec-trophotometrically at temperatures ranging from 20 to 35℃ and over the pH range 5.57 to 7.48 with the aid of a rapid mixing device. The FeII (EDTMP) (NO) solution, prepared by introducing nitric oxide into FeII (EDTMP)solution, was mixed instantaneously with sodium sulfite solution. Then the sequential change in absorbance of the solution at 590-600 nm was scanned. The reaction was of second order at pH 5.88 and I = 0.3 mol/l.The reaction rate constant k at 20,25,30 and 35℃ was determined to be 1.95,3.03, 5.48 and 7.05 l/(mol. min), respectively. The apparent activation- energy for this reaction was calculated to be 68.6kJ/mol, which was smaller than that of the-FeII(EDTA)(NO)system(102.9 kJ/mol at pH 5.97). The dependence of the reaction rate on pH was discussed.

邓援建,庄亚辉. 亚硝酰亚铁螯合物(Ⅲ)Fe~Ⅱ(EDTMP)(NO)与亚硫酸钠的反应动力学研究 [J]. CIESC Journal.

Deng Yuanjian and Zhuang Yahui (Research Center for Eco-environmental Sciences, Academia Sinica, Beijng). Nitrosyl Ferrous Chelates(Ⅲ) Kinetics of the Reaction Between Fe~Ⅱ (EDTMP) (NO) and Sodium Sulfite[J]. .