A High Selective Chemiluminescent Probe Derived from Iso‐luminol Enabling High Sensitive Determination of Ferrous Ions in the Environmental Waters. Issue 11 (18th August 2021)

• Record Type: Journal Article
• Authors: Zhang, Shenghai; Shi, Yalin; Deng, Jiawang; Zhang, Jidong; Cheng, Mengqi; Yu, Geting
• Is Part Of: Chinese journal of chemistry. Volume 39:Issue 11(2021)
• Page Start: 2967
• Page End: 2972
• Publication Date: 2021-08-18
• Subjects: Chemiluminescence probe -- Synthesis design -- Ferrous ions -- Analytical method -- Environmental waters; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/cjoc.202100057
• Languages: English
• ISSNs: 1001-604X

Abstract

Main observation and conclusion: A new chemiluminescence (CL) reagent named 4‐amino‐5‐thiocyanato‐phthalyl‐hydrazine ( iso ‐luminol‐SCN) is synthesized by the bromide‐mediated substitution reaction of iso ‐luminol with sodium thiocyanate in dimethyl formamide (DMF) at room temperature. Strong CL is observed for iso ‐luminol‐SCN oxidized by hydrogen peroxide (H2 O2 ) in the presence of Fe 2+, with the CL intensity strongly depending on the concentration of Fe 2+ and being hardly interferred by other common metal ions. Based on this fact, a flow injection CL method is established for the high sensitive and selective determination of Fe 2+ . The CL intensity was linearly correlated with the concentration of Fe 2+ in the range of 1.0 × 10 –8 mol·L –1 to 1.0 × 10 –5 mol·L –1 following the equation CLnet = 166.3 c + 57.7 ( c, ×10 –6 mol·L –1 ; n = 7; R 2 = 0.9988). The detection limit is calculated to be 3.2 × 10 –9 mol·L –1 Fe 2+ based on the 3S0 /K principle. The relative standard deviation (RSD) was 3.7% for 1.0 × 10 –6 mol·L –1 Fe 2+ ( n = 11), a support for the precision of Fe 2+ measurement. The recoveries of Fe 2+ were obtained in the range of 98.8%—101.6% in three real water samples, showing the applicability and reliability by the proposed method. The possible CL mechanism is proposed based on the kinetic characteristic of the CL reaction and the CL spectrum. Abstract : A New CL reagent family member termed iso ‐luminol‐SCN with high oxidation efficiency by the produced ·OH from Fenton reaction results in superb selective and sensitive detection for Fe 2+ .