Ultra-sensitive speciation analysis of tellurium by manganese and iron assisted photochemical vapor generation coupled to ICP-MS/MS

Non-chromatographic Speciation Analysis of Tellurium by HG-ICP–MS/MS at Sub ng L–1 Concentration in Natural Waters Using TiIII as a Pre-Reducing Agent

“…Some discrepancy was found for ocean water CRMs ranging 1.1−1.8 ng L −1 Te IV+VI in CASS-5, CASS-6, and NASS-7 (Table 1) compared to previously reported values of 45 ± 6 ng L −1 total tellurium for CASS-5 41 and similar values in previous generations of NASS (46 ± 5 ng L −1 for NASS-4 and 48 ± 5 ng L −1 for NASS-5). Very recently, a value of <LOD of 5.7 ng L −1 total tellurium was reported for CASS-5 and NASS-7, 27 in agreement with low concentrations found in our work.…”

“…Similar O 2 mode conditions were chosen recently for tellurium determination by photochemical vapor generation coupled to ICP−MS/MS. 27 Even if the use of the reaction cell with O 2 improves the background, it leads to significant reduction of the sensitivity. The use of auxiliary gases in the reaction cell, such as He and H 2 , may increase the reaction stability and, therefore, the sensitivity.…”

“…The recent progress of triple quadrupole ICP−MS/MS may be a reliable solution for tellurium detection due to its more efficient elimination of spectral interferences. 27,28 Further improvement in not only sensitivity but also selectivity can be obtained by coupling ICP−MS to hydride generation (HG) for sample introduction. The analyte is converted to its volatile species, highly efficiently transported to the detector in the gas phase, and separated from potential matrix components, which substantially reduces interferences during spectrometric detection.…”

Highly Efficient Photochemical Vapor Generation for Sensitive Determination of Iridium by Inductively Coupled Plasma Mass Spectrometry

“…Metal sensitizers exhibiting such effects on PVG include: Cd 2+ ions for As 3+ and As 5+ , Se 6+ , and W 6+ ; Co 2+ ions for Bi 3+ , , Cd 2+ , Ge 4+ , Pb 2+ , Sb 3+ , Te 4+ , and Tl + ; Cu 2+ ions for Br – , Cl – , , F – , , Ir 3+ , and Rh 3+ ; Fe 2+ and/or Fe 3+ ions for As 3+ , Bi 3+ , Te 4+ , Mo 6+ , Cd 2+ , and Os 4+ ; Ni 2+ ions for Pb 2+ ; and V 4+ and V 5+ for Te 4+ and Te 6+ . A greater effect (additive or synergistic) was reported for several analytes when a combination of two metal sensitizers was employed: namely, Co 2+ and Cu 2+ ions for Mo 6+ ; Cd 2+ and Co 2+ for Os 4+ , Re 7+ , and Ru 3+ ; , and Mn 2+ and Fe 2+ ions for Te 4+ . The mechanism of the action of the metal sensitizers on PVG remains to be fully elucidated, but the latest studies dealing with application of electron paramagnetic resonance spin trapping techniques support the initial thesis that transition metal ions enhance the yield of highly reducing CO 2 •– during UV irradiation of HCOOH. ,,,, …”

“…11,17 In addition, Mn 2+ , recently reported effective for PVG of Te 4+ , was tested. 36 The effects of various concentrations of individual metal ions on PVG of Ir at a sample flow rate of 1.5 mL min −1 are shown in Figure 2.…”