| 1. |
- Enger, Jonas, et al.
(författare)
-
Direct detection of antimony in environmental and biological samples at trace concentrations by laser-induced fluorescence in graphite furnace with an intensified charge coupled device
- 1995
-
Ingår i: Journal of Analytical Atomic Spectrometry. - : Royal Society of Chemistry. - 0267-9477 .- 1364-5544. ; 10:8, s. 539-549
-
Tidskriftsartikel (refereegranskat)abstract
- The technique of laser-induced fluorescence in graphite furnace (LIF-GF) with intensified charge coupled device (ICCD) detection was used for the detection of Sb at pg ml-1 concentrations in various biological and environmental samples. The ICCD detector permits the simultaneous multichannel detection of large fluorescence wavelength regions, which gives the user the possibility to control and correct for various background signals (which is important when complex environmental and biological samples are to be analysed). The detection limit for Sb in a pure water solution was found to be 5 fg. Antimony was directly detected in pure aqueous solutions down to fg ml-1 concentrations. A variety of aqueous and solid environmental and biological samples were investigated with respect to their Sb content. Good agreement between the measured and certified Sb contents (at pg ml-1 - ng ml-1 levels) was obtained for various certified reference materials, viz., marine sediments (MESS-1 and BCSS-1) and riverine water (SLRS-2). Measurements of the Sb content in non-certified natural drinking water, estuarine water reference material (SLEW-1), serum reference material (Seronorm), and whole blood of healthy Swedish people were also performed. After a thorough investigation and elimination of various sources of contamination (regarding sampling and sample storage), typical levels of Sb in human whole blood at or below several tens of pg ml-1 were obtained. These levels are significantly lower than previously established values of the normal Sb content in human blood. The detection limit for Sb in human whole blood was close to that of pure water.
|
|
| 2. |
- Majidi, Vahid, et al.
(författare)
-
Improving sensitivity for CE-ICP-MS using multicapillary parallel separation
- 1999
-
Ingår i: Journal of Analytical Atomic Spectrometry. - : Royal Society of Chemistry (RSC). - 0267-9477 .- 1364-5544. ; 14:12, s. 1933-1935
-
Tidskriftsartikel (refereegranskat)abstract
- A multicapillary, capillary electrophoresis inductively coupled plasma mass spectrometry interface is described. This interface allows for higher sample loading to improve the overall sensitivity and analyte detection limits without sacrificing the separation efficiencies. The results obtained with this parallel system are presented for a cross flow nebulizer. A comparison of single capillary electrophoresis for both DIHEN and cross flow nebulizers is presented.
|
|
| 3. |
- Rodushkin, Ilya, et al.
(författare)
-
Determination of trace metals in estuarine and sea-water reference materials by high resolution inductively coupled plasma mass spectrometry
- 1997
-
Ingår i: Journal of Analytical Atomic Spectrometry. - 0267-9477 .- 1364-5544. ; 12:10, s. 1181-1185
-
Tidskriftsartikel (refereegranskat)abstract
- A rapid method for the determination of 15 trace metals in saline water samples by high resolution inductively coupled plasma mass spectrometry (HR-ICP-MS) was tested. The method was validated by the analysis of estuarine (SLEW-2), coastal (CASS-2) and open ocean (NASS-4) water certified reference materials. No sample pre-treatment other than acidification and dilution was carried out. Results in good agreement with certified values (where available) were obtained for all metals except for Cd and Zn. Discrepancies for these elements are explained by an unresolved MoO interference (Cd) and insufficient internal standard correction (Zn). Present data indicate that HR-ICP-MS is applicable to the rapid and accurate multi-element determination, virtually free from spectral interferences, of trace metals at pg ml[^^ -1] levels in saline water.
|
|
| 4. |
- Rodushkin, Ilya, et al.
(författare)
-
Non-spectral interferences caused by a saline water matrix in quadrupole and high resolution inductively coupled plasma mass spectrometry
- 1998
-
Ingår i: Journal of Analytical Atomic Spectrometry. - 0267-9477 .- 1364-5544. ; 13:3, s. 159-166
-
Tidskriftsartikel (refereegranskat)abstract
- Non-spectral interferences caused by a sea-water matrix diluted 5-fold on the analyte signals of 24 trace elements in ICP-MS were studied in relation to instrumental parameters. Both quadrupole (ICP-QMS) and double focusing-sector (ICP-SMS) ICP-MS were studied. The parameters were torch injector diameter, sampling depth (i.e., distance from the load coil to the sampler orifice) and rf power. A distinction was made between absolute matrix effects, expressed as integrated signal recovery over a range of nebulizer flow rates (NFR), and matrix effects monitored at a fixed NFR. For the elements studied, it was found that the degree of non-spectral interference depends on both ionization potential (IP) and atomic mass. Generally, the greater the IP and atomic mass of the analyte, the lower the recovery in the presence of the matrix. It appears that, by using optimum plasma settings in ICP-SMS, analyte signal changes may be kept to a moderate level during prolonged introduction of a sea-water matrix. The accuracy of the analytical results can be further improved by using a systematically selected set of internal standard elements
|
|
