scholarly journals Determination of Metal Impurities in Carbon Nanotubes Sampled Using Surface Wipes

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Mary-Luyza Avramescu ◽  
Pat E. Rasmussen ◽  
Marc Chénier
Keyword(s):  
Carbon Nanotubes ◽  
Inductively Coupled Plasma ◽  
Microwave Digestion ◽  
Cost Effective ◽  
Inductively Coupled ◽  
Metal Impurities ◽  
Wipe Sampling ◽  
Icp Ms ◽  
Plasma Mass Spectrometry

Residual metal impurities in carbon nanotubes (CNTs) provide a means to distinguish CNT from non-CNT sources of elemental carbon in environmental samples. A practical and cost-effective analytical approach is needed to support routine surface monitoring of CNT metal tracers using wipe sampling. Wipe sampling for CNT metal tracers is considered a qualitative indicator of the presence of CNTs, not a quantitative exposure metric. In this study, two digestion approaches (microwave-assisted nitric acid/H2O2 digestion and ultrasonic nitric/HF acid digestion) in conjunction with Inductively Coupled Plasma Mass Spectrometry (ICP-MS) determination were evaluated for their ability to extract metal impurities from CNT particles captured on wipe substrates. Aliquots of different carbon nanotubes (including NIST 2483 single-wall CNT) with and without GhostWipes™ (ASTM E-1792 compliant) were used to compare the performance of the digestion methods. The microwave digestion method accommodated the bulky wipe sample and also eliminated potential ICP-MS signal interferences related to incomplete digestion. Although quantitative recoveries requiring lengthy multistep digestion protocols may be necessary in other applications, the near-total recoveries achieved in the present study for CNT catalyst elements were adequate for identifying surface contamination of CNTs in the workplace using wipe sampling.

scholarly journals Optimized Simultaneous Determination of Several Elements in Human Intestinal Caco-2 TC7 Cells by Inductively Coupled Plasma-Mass Spectrometry after Closed Vessel Microwave Digestion

2003 ◽  
Vol 86 (6) ◽  
pp. 1225-1231 ◽  
Author(s):  
Laurent Noël ◽  
Thierry Guérin ◽  
Jean-Marc Frémy ◽  
Hélène Huet ◽  
Martine Kolf-Clauw
Keyword(s):  
Mass Spectrometry ◽  
Inductively Coupled Plasma ◽  
Certified Reference Materials ◽  
Microwave Digestion ◽  
Absorption Spectrometry ◽  
Inductively Coupled ◽  
Flame Atomic Absorption ◽  
Icp Ms ◽  
Plasma Mass Spectrometry

Abstract A rapid procedure, based on closed vessels microwave digestion and inductively coupled plasma-mass spectrometry (ICP-MS), was evaluated to ascertain the effect of chronic exposure to cadmium on intracellular accumulation of minor and essential trace elements in cultured epithelial cells (Caco-2 TC7). For all measurements, the method of external calibration was used and 3 elements (Be, Sc, In) were selected as internal standards. Optimization procedures are discussed and results are presented for the total determination of 9 key analytes (Na, Mg, Ca, Cr, Mn, Cu, Zn, Mo, and Cd) in certified reference materials (CRMs) and 20 samples of Caco-2 TC7 cells long-term exposed to Cd. The performance characteristics of the analytical system were evaluated by calibration and linearity, limits of detection and quantitation, accuracy with spiking, trueness and repeatability with available CRMs. As a complement to the ICP-MS determinations, both available CRMs and cell samples were analyzed either by electro thermal-or flame atomic absorption spectrometry. The results were in good agreement with the ICP-MS results.

Determination of Boron in Coal Using Closed-Vessel Microwave Digestion and Inductively Coupled Plasma Mass Spectrometry (ICP-MS)

2014 ◽  
Vol 28 (7) ◽  
pp. 4517-4522 ◽  
Author(s):  
Shifeng Dai ◽  
Weijiao Song ◽  
Lei Zhao ◽  
Xiao Li ◽  
James C. Hower ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Inductively Coupled Plasma ◽  
Microwave Digestion ◽  
Closed Vessel ◽  
Inductively Coupled ◽  
Icp Ms ◽  
Plasma Mass Spectrometry

Determination of Elements in Carbon Fiber Using Inductively Coupled Plasma Mass Spectrometry (ICP-MS)

2013 ◽  
Vol 423-426 ◽  
pp. 767-770
Author(s):  
Ting Zhao ◽  
Ming Qiang Zhou ◽  
Wei Li Liu ◽  
Wei Huang ◽  
Jun Zhi He ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Carbon Fiber ◽  
Inductively Coupled Plasma ◽  
Microwave Digestion ◽  
Volatile Elements ◽  
Inductively Coupled ◽  
Icp Ms ◽  
Dry Digestion ◽  
Plasma Mass Spectrometry

Based on microwave digestion and dry digestion, the concentrations of Si, S, Ca, Cr, Fe, Ni, Cu, Al, Mo, Sb, Ti, V, Y and Zn in carbon fiber were determined using inductively coupled plasma mass spectrometry (ICP-MS). Compare with the concentrations in the solution got by microwave digestion, the concentrations in the solution got by dry digestion are higher. And microwave digestion is more suitable for treatment of carbon fiber containing volatile elements than dry digestion.

scholarly journals Determination of Metals in Composite Diet Samples by Inductively Coupled Plasma-Mass Spectrometry

2003 ◽  
Vol 86 (2) ◽  
pp. 439-448 ◽  
Author(s):  
Lisa Jo Melnyk ◽  
Jeffrey N Morgan ◽  
Reshan Fernando ◽  
Edo D Pellizzari ◽  
Olujide Akinbo
Keyword(s):  
Mass Spectrometry ◽  
Atmospheric Pressure ◽  
Inductively Coupled Plasma ◽  
Microwave Digestion ◽  
Standard Reference Materials ◽  
Inductively Coupled ◽  
Icp Ms ◽  
Relative Standard ◽  
Plasma Mass Spectrometry

Abstract A study was conducted to evaluate the applicability of inductively coupled plasma-mass spectrometry (ICP-MS) techniques for determination of metals in composite diets. Aluminum, cadmium, chromium, copper, lead, manganese, nickel, vanadium, and zinc were determined by this method. Atmospheric pressure microwave digestion was used to solubilize analytes in homogenized composite diet samples, and this procedure was followed by ICP-MS analysis. Recovery of certified elements from standard reference materials ranged from 92 to 119% with relative standard deviations (RSDs) of 0.4–1.9%. Recovery of elements from fortified composite diet samples ranged from 75 to 129% with RSDs of 0–11.3%. Limits of detection ranged from 1 to 1700 ng/g; high values were due to significant amounts of certain elements naturally present in composite diets. Results of this study demonstrate that low-resolution quadrupole-based ICP-MS provides precise and accurate measurements of the elements tested in composite diet samples.

scholarly journals Comparison of DMA-80 and ICP-MS Combined with Closed-Vessel Microwave Digestion for the Determination of Mercury in Coal

2020 ◽  
Vol 2020 ◽  
pp. 1-9 ◽  
Author(s):  
Siyu Zhang ◽  
Mingxuan Zhou
Keyword(s):  
Mercury Concentration ◽  
Inductively Coupled Plasma ◽  
Microwave Digestion ◽  
Mercury Content ◽  
Test Results ◽  
Closed Vessel ◽  
Inductively Coupled ◽  
Icp Ms ◽  
Plasma Mass Spectrometry

As one of the most widely used techniques for concentration determination of trace elements in coal, inductively coupled plasma mass spectrometry (ICP-MS) has also been used in several studies for the determination of mercury concentration in coal. ICP-MS after closed-vessel microwave digestion and a Milestone DMA-80 are employed in this study to determine the mercury concentration in coal. Three NIST  standard references of coal samples were selected as references to verify the accuracy of the test results. The Au rinse solution (200 μg/L, 5% HNO3) can diminish mercury memory effects to a blank level within 80 seconds. The results showed that ICP-MS can accurately determine the mercury content in mercury standard solutions, but the mercury concentration in most NIST samples after microwave digestion is lower than the detection level of the ICP-MS. The inaccuracy may be due to volatilization of mercury during solid sample digestion process. By contrast, the determined concentrations in NIST samples by the Milestone DMA-80 are very close to the verified values. Therefore, ICP-MS is not recommended to analyze mercury in coal after digestion even in a closed-vessel digestion system, but the mercury direct analyzer (without digestion) is recommended to analyze mercury in coal.

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