ORIGINAL RESEARCH
Spectrophotometric Determination of Fe(II)EDTA-NO, Fe(II)EDTA/Fe(III)EDTA in Chemical Absorption-Biological Reduction Integrated NOx Removal System
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Wei Li 2
 
 
 
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1
Key Laboratory for Technology in Rural Water Management of Zhejiang Province, Zhejiang University of Water Resources and Electric Power, Hangzhou, 310018, China
2
Key Laboratory of Biomass Chemical Engineering of Ministry of Education, Institute of Industrial Ecology and Environment, Zhejiang University (Yuquan Campus), Hangzhou, 310027, China
CORRESPONDING AUTHOR
Wei Li   

Zhejiang University, China
Submission date: 2021-11-04
Final revision date: 2022-01-26
Acceptance date: 2022-01-29
Online publication date: 2022-05-02
Publication date: 2022-06-20
 
Pol. J. Environ. Stud. 2022;31(4):3335–3342
 
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ABSTRACT
Fe(II)EDTA-NO, Fe(II)EDTA and Fe(III)EDTA are three key chemical species in the chemical absorption-biological reduction (CABR) integrated NOx removal system. The original ferrozine method was modified to quickly determine Fe(II)EDTA/Fe(III)EDTA in small volumes of liquid samples. It is shown that the presence of EDTA do create differences in absorbance. The measurement of Fe(II)EDTA and total iron were performed on two separate sample fractions. A spectrophotometric method for direct determination of Fe(II)EDTA-NO was proposed. The results indicated that Fe(II)EDTA-NO could be accurately determined by spectrophotometry under optimized conditions: an absorption wavelength of 438 nm, pH between 5.23~8.07, and operating time under one minute. The final standard curve was given and the mathematic relations among them were also discussed.
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ISSN:1230-1485