Pneumatic Flow Injection Analysis-Tandem Spectrometer System for Iron Speciation

Abstract

A pneumatic flow injection-tandem spectrometer system, without a delivery pump was used for the speciation of iron. In this system, the suction force of a pneumatic nebulizer of a flame absorption spectrometer was used for solution delivery through the manifold. The Fe(III) and total Fe concentrations were determined using thiocyanate ion in a UV-Vis spectrometer and a FAAS, respectively. The Fe(II) was determined by the difference. The calibration curves were linear up to 18 microg mL(-1) and 25 microg mL(-1) with detection limits of 0.09 microg mL(-1) and 0.07 microg mL(-1) for Fe(III) and Fe(II), respectively. The mid-range precision and accuracy were <2.5% and +/-3% for the two species, respectively, at a sampling rate of 120 h(-1). This system was applied for the determination of Fe(III) and Fe(II) in industrial water, natural water and spiked samples.

Investigation of a new electrochemical cyanide sensor based on Ag nanoparticles embedded in a three-dimensional sol–gel

“…Our research group previously published some new methods for determination of cyanide using flow injection analysis-flame atomic absorption spectrometry (FIA-FAAS) by solid-phase reagents (SPR) such as MCO 3 (M = Cd, Zn), Ag 2 X (X ¼ SO 2À 3 , Cr 2 O 2À 7 , C 2 O 2À 4 and CO 2À 3 ) and AgX (X = Cl À , Br À , I À and N 3 À ) [29][30][31][32]. The best detection limit was obtained 1.92 Â 10 À6 mol L À1 .…”

A Comparative Study of AgX (X = Cl−, Br−, I− and N3−) Solid-Phase Reactors for Flow-Injection Determination of Cyanide in Electroplating Wastewater

“…The figures of merit, such as the samples rate, dynamic range, limit of quantitation (LOQ) and relative standard deviation (RSD %) of the proposed method with other published method using solidphase reagents, 19,20,36,37 are compared in Table 3. The figures of merit of the proposed method seem to be favorable compared with other published procedures for the determination of cyanide.…”

“…7 Most of the CN -in blood concentrates in the erythrocytes, 8 presumably bound to methemoglobin, 9 an oxidized form of hemoglobin, which acts as a "cyanide sink". 8 Therefore, because of its extreme toxicity, a great deal of research has been done for cyanide determination using various techniques and methods, for example, its determination and evaluation by volumetric and gravimetric, 10 high-performance liquid chromatography (HPLC), 11 ion chromatography (IC), 12 voltammetry, 13 amperometry, 14 polarography, 15 potentiometry using solid-state membrane ion-selective electrodes, 16,17 atomic absorption spectroscopy, [18][19][20] spectrophotometric 21 and fluorometry. 22 Also, there are many FI methods with different detection systems that have been reported for the determination of cyanide in water and wastewater samples.…”

Double-sided Microfluidic Device for Speciation Analysis of Iron in Water Samples: Towards Greener Analytical Chemistry

“…Such assessments would need to be carried out either in fields or immediately after collecting samples, because Fe 2+ tends to rapidly oxidize and become Fe 3+ . There are numerous analytical techniques used for iron speciation, such as ion chromatography, [4][5][6][7][8][9] flow-based analysis, [10][11][12][13][14][15] solvent extraction and flame atomic absorption spectrometry (AAS), 16 voltammetry, [17][18][19] and fluorescence spectrophotometry. 20 However, apart from some flow-based analysis systems, these techniques are infrequently used in field work due to the instrument size and a non-portable nature.…”