title: Determination of ethylenediaminetetraacetic acid base on the reversion of fluorescence quenching of 2-pyridinecarbaldehyde-p-phenyldihydrazone by ferric iron.
abstract: A fast and sensitive fluorometric method for determination of an emerging pollutant, ethylenediaminetetraacetic acid (EDTA), was proposed based on the reversion of fluorescence quenching of 2-pyridinecarbaldehyde-p-phenyldihydrazone by ferric iron. It was found that Fe(3+) could selectively quench the fluorescence of 2PC-PPH, while EDTA could recover it due to its strong coordination ability with Fe(3+). Based on this, we established an "Off and On" fluorescence method for determination of EDTA. Under the optimum conditions, the linear range and detection limit (3S/N) for EDTA determination were 2.0 × 10(-6)~1.4 × 10(-5) mol L(-1) and 1.5 × 10(-7) mol L(-1), respectively. The relative standard deviation for the determination of 7.0 × 10(-6)mol L(-1) EDTA was 3.7% (n=11). The method was successfully applied to determination of EDTA in tap water, lake water and investigating degradation of EDTA by TiO2/UV process.
authors: School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
authors: Biyun
authors: B
authors: Fang
authors: Yan
authors: Y
authors: Liang
authors: Ting
authors: T
authors: Wu
authors: Lin
authors: L
authors: Chang
authors: Quanyingg
authors: Q
authors: Zhou
authors: Fang
authors: F
authors: Chen
mesh_terms: D002412:Cations / Q000737:chemistry; D060766:Drinking Water / Q000032:analysis; D004492:Edetic Acid / Q000032:analysis*; D005453:Fluorescence; D006835:Hydrazones / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D060106:Lakes / Q000032:analysis; D011725:Pyridines / Q000737:chemistry*; D013050:Spectrometry, Fluorescence / Q000379:methods*; D014877:Water Pollution, Chemical / Q000032:analysis*
chemical_list: C573995:2-pyridinecarbaldehyde-p-phenyldihydrazone; D002412:Cations; D060766:Drinking Water; D006835:Hydrazones; D011725:Pyridines; D004492:Edetic Acid; D007501:Iron
keywords: 2-Pyridinecarbaldehyde-p-phenylenedihydrazone; EDTA; Fe(3+); Fluorescence