Flow‐injection determination of manganese (II) using surfactant enhanced diperiodatonickelate (IV)‐rhodamine 6G chemiluminescence

• Published in: Luminescence (Chichester, England) England), 2020-02, Vol.35 (1), p.79-89
• Main Authors: Asghar, Muhammad, Yaqoob, Mohammad, Siddiqui, Masood Ahmed, Munawar, Nusrat, Waseem, Amir, Nabi, Abdul
• Format: Article
• Language: English
• Subjects: Analytical methods; Calibration; certified reference materials; Chemiluminescence; Chromium; Elution; flow‐injection analysis; Heavy metals; Hydroxyquinoline; Injection; Iron; Manganese; Metal ions; Natural waters; Ni(IV) complex; Organic chemistry; Reaction mechanisms; Reference materials; Rhodamine 6G; Surfactants; trace metals; Water analysis; Water sampling
• ISSN: 1522-7235; 1522-7243
• DOI: 10.1002/bio.3700

Chemiluminescence (CL) of the rhodamine 6‐G‐diperiodatonickelate (IV) (Rh6‐G‐Ni(IV) complex) in the presence of Brij‐35 was examined in an alkaline medium and implemented using flow‐injection analysis to analyze Mn(II) in natural waters. Brij‐35 was identified as the surfactant of choice that enhanced CL intensity by about 62% of the reaction. The calibration curves were linear in the range 1.7 × 10−3 – 0.2 (0.9990, n = 7) and 8.0 × 10−4 – 0.1 μg ml−1 (0.9990, n = 7) with limits of detection (LODs) (S:N = 3) of 5.0 × 10−4 and 2.4 × 10−4 μg ml−1 without and with using an in‐line 8‐hydroxyquinoline (8‐HQ) resin mini‐column, respectively. The sample throughput and relative standard deviation were 200 h−1 and 1.7–2.2% in the range studied respectively. Mn(II) concentrations in certified reference materials and natural water samples was successfully determined. A brief discussion about the possible CL reaction mechanism is also given. In addition, analysis of V(III), Cr(III) and Fe(II) was also performed without and with using an in‐line 8–HQ column and selective elution of each metal ion was achieved by adjusting the pH of the sample carrier stream with aqueous HCl solution.