Titanium as a chemical modifier for the determination of cobalt in marine sediments

Atomic spectrometry update. Environmental analysis

“…The determination of Co in marine sediments by ETAAS was studied using no modifier and Mg and Ti as modifiers. 162 In the original matrix, LOD values of 0.4 mg g 21 using no modifier and 0.3 mg g 21 with Ti as modifier were obtained. Lima and co-workers 163 thermally deposited different permanent modifiers (W, Rh, Ir, Ru, W-Rh, W-Ru, W-Ir) on the integrated platform of a transversely heated graphite atomiser for the determination of As, Cd and Pb in soil, coal, natural waters and sediments by ETAAS.…”

Developments in the Determination of Trace Elements by Atomic Spectroscopic Techniques

“…For a review see Vale and Welz (2002). However, studies of Moreira et al (2002) show the feasibility of titanium as chemical modifier for cobalt determination in marine sediments; cobalt in the sediment extract is probably reduced to CoO, and the main purpose of Ti is its transformation to metal-like carbide producing a carbide layer on the graphite platform, and not the thermal stabilization of the analyte. So this layer could promote a better dissociation of the CoO, improving sensitivity.…”

Tube atomizers in thermospray flame furnace atomic absorption spectrometry: characterization using X-ray fluorescence, scanning electron microscopy and chemometrics

“…To propose the optimum metal characteristics used for atomizer compositions and to identify new compositions, an approach was adopted by selecting 34 elements and its respective 22 selected physicochemical parameters. [17][18][19] The elements were selected following the criteria: (a) those normally found in tubes used in AAS [20][21][22] (Mo, Ni, and W), (b) those commonly used as chemical modifiers (CM-conventional or permanent) in AAS [23][24][25][26][27][28] (Ir, Mg, Mo, Pd, Rh, Ti, V, W and Zr), (c) those already determined by TS-FF-AAS [1][2][3][4][5][6][7]29,30 (Ag, As, Au, Bi, Cd, Co, Cu, Hg, K, Mn, Pb, Pd, Rb, Sb, Se, Sn, Te, Tl and Zn) and (d) those with analytical interest (Al, Ca, Cr, Fe, Li and Na). Some elements (Mo, W and Pd) were classified in two groups.…”