Molybdenum, Mo–Ir and Mo–Ru coatings as permanent chemical modifiers for the determination of cadmium and lead in sediments and soil samples by electrothermal atomic absorption spectrometry

Acar, Orhan

doi:10.1016/j.aca.2005.03.017

Cited by 20 publications

(13 citation statements)

References 27 publications

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“…It is generally known that chemical modifiers stabilize the analyte and effectively contribute to the removal of the sample matrix in the ETAAS analysis procedure, which reduces the background contribution and minimizes chemical interferences. [13][14][15][16][17][18][19][20]23 Thereafter, a chemical modifier mixture was always injected simultaneously with the sample solution (20 µL sample/blank solution plus 5 µL chemical modifier solution). Figure 3 shows the influence of the presence of the chemical modifier (8.0 µg/L Pd/10.0 µg Mg[NO 3 ] 2 in 5 µL solution) on the As analyte absorbance (Fig.…”

Section: Ashing and Atomization Temperature Optimizationmentioning

confidence: 99%

“…9,[15][16][17][18][19][20][21][22] Furthermore, elements that form carbides such as molybdenum, hafnium, niobium, tungsten, tantalum, and zirconium, as well as NH 4 HPO 4 -Mg(NO 3 ) 2 , nitric acid, and silver nanoparticles have also been suggested. 21,23,24 How exactly the chemical modifier works is a matter of debate. Regarding Pd as a chemical modifier, it has been proposed that it either forms a nonvolatile intermetallic compound or a solid solution with Pd 25 or it could somehow be connected with a reaction that includes graphite material and the analyte.…”

Section: Introductionmentioning

confidence: 99%

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Trace Arsenic Determination in a TiO2 Pigment Matrix Using Electrothermal Atomic Absorption Spectrometry

2020

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This work describes the use of electrothermal atomic absorption spectrometry in combination with a pyrolytic graphite-coated tube with a platform for trace arsenic (As) determination in titanium dioxide (TiO2) pigment. This type of matrix is challenging, as complete digestion in hydrofluoric acid-containing solution is needed. First, closed-vessel microwave digestion was performed for the full-sample decomposition. Next, a temperature program was optimized for drying, pyrolysis, and atomization temperatures. Furthermore, the use of a chemical modifier mixture was proposed that reduced the background contribution and prevented significant analyte loss and therefore improved the analytical procedure. The optimized method was validated for the detection (LOD) and quantification (LOQ) limits, the linear concentration range, accuracy, and precision. Special attention was devoted to the matrix-matching solutions in the calibration procedure. Linearity was confirmed in the 5.0 to 100.0 µg/L concentration range ( R2 = 0.999). The average recovery for 16 different real TiO2 pigment samples was 92.0%, and the relative standard deviation value for six replicate measurements was ≤10.4%. Moreover, the LOD and LOQ in terms of the TiO2 pigment mass was determined to be 0.2 µg/(g TiO2) and 0.7 µg/(g TiO2), respectively. The latter complies with Commission Directive 2008/128/EC, which does not allow more than 3 µg As/(g product) as the specific criteria of purity. Finally, based on scanning electron microscopy analysis of unused and several times used pyrolytic graphite-coated tubes, usage of the tube 250 times before replacement is recommended.

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Section: Ashing and Atomization Temperature Optimizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Trace Arsenic Determination in a TiO2 Pigment Matrix Using Electrothermal Atomic Absorption Spectrometry

2020

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“…Analytical grade reagents of HNO3 (65%, w/w, Chem-Lab NV), HCl (37%, w/w -Sigma Aldrich) and Triton X-100 (99.95%, w/w-Merck) were used without further purifications. The autosampler washing solution containing HNO3 0.2% (v/v) and Triton X-100 0.1% (v/v) was used to avoid clogging of the autosampler capillary tip, to prevent analyte adsorption of on the surface of the autosampler cups and to modify physical properties of the solution in order to improve the dispersion of sample onto the platform [5,[10][11][12].…”

Section: Materials Reagents and Solutionsmentioning

confidence: 99%

“…This outcome effect is must desired in the analysis of volatile semimetals (As, Se, Te etc). Noble metals with high melting point (Pd, Pt, Ir, Rh and Ru) [2][3][4] and elements that can form carbides (Mo, Hf, Nb, W, Ta, Zr) [5] are the most employed as mono or multi-component matrix modifiers in ETAAS technique. The most used is paladium which can be combined with magnesium nitrate or organic compounds [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

The Determination of Lead, Chromium, Arsenic and Selenium in Sediments and Soil Samples by Electrothermal Atomic Absorption Spectrometry Using Chemical Modifiers

Dediu¹,

Kim²,

Cosma³

et al. 2016

Simi 2016

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The effectiveness of some chemical matrix modifiers for the determination of lead, chromium, selenium and arsenic in sediments and soils by Zeeman electrothermal atomic absorption spectrometry have been evaluated. The addition of certain chemical modifiers decreases the volatility of the analyte element, preventing its loss during pyrolysis step while increasing the volatility of matrix components promoting a better separation also allows a higher pretreatment temperature for better separation between analyte and matrix. Pyrolysis and atomization temperatures, characteristic masses and detection limits of analytes in dissolved samples with and without modifiers have been compared. The method was validated by analysing certified reference lake sediment and soil materials.

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“…Therefore, it has been necessary for analytical chemists to evaluate the environmental and healthy quantities based on accurate determination of Cd 2+ and Pb 2+ both in environmental and biological samples. For this purpose, the analytical methods including electrothermal atomic absorption spectrometry (ETAAS) [6][7][8][9][10][11][12][13], graphite furnace AAS [14][15][16], electroanalytical methods [17,18], inductively coupled plasmaatomic emission spectrometry (ICP-AES) [19] and inductively coupled plasma-mass spectrometry (ICP-MS) [20,21] are generally used. Most of these methods have disadvantages as far as cost and instruments used in routine analysis are concerned.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous preconcentration of lead and cadmium ions with methyltrioctylammonium chloride supported on microcrystalline naphthalene and determination by flame atomic absorption spectrometry

2010

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A sensitive and selective preconcentration method has been developed for the determination of trace amounts of lead and cadmium ions by using naphthalenemethyltrioctylammonium chloride as an adsorbent. Lead and cadmium ions were retained by the adsorbent in the minicolumn as PbI4 2-and CdI4 2-, respectively. The column was washed by 5 mL of 2 mol L -1 nitric acid solution to elute the adsorbed cations. The collected eluents then were determined by flame atomic absorption spectrometry (FAAS). Potential factors affecting on the recovery of the analytes were investigated. Meanwhile optimum conditions were established. The preconcentration factor for lead (II) and cadmium (II) have been 300 and 100, respectively. The calibration curves were linear in the range of 3 to 100 ng mL -1 for Pb 2+ and in the range of 1 to 100 ng mL -1 for Cd 2+ , in the original water samples. The detection limits for Pb 2+ and Cd 2+ are 0.42 and 0.072 ng mL -1 respectively. On the other hand, the relative standard deviation (RSD) for 11 replicate measurements of 20 ng mL -1 Pb 2+ and Cd 2+ were 2.2% and 1.4% in the initial solution respectively (n=11). The developed method was successfully applied for the determination of trace Pb 2+ and Cd 2+ ions in a variety of water samples. Cadmium Lead FAAS Preconcentration Microcrystalline naphthalene

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Molybdenum, Mo–Ir and Mo–Ru coatings as permanent chemical modifiers for the determination of cadmium and lead in sediments and soil samples by electrothermal atomic absorption spectrometry

Cited by 20 publications

References 27 publications

Trace Arsenic Determination in a TiO2 Pigment Matrix Using Electrothermal Atomic Absorption Spectrometry

Trace Arsenic Determination in a TiO2 Pigment Matrix Using Electrothermal Atomic Absorption Spectrometry

The Determination of Lead, Chromium, Arsenic and Selenium in Sediments and Soil Samples by Electrothermal Atomic Absorption Spectrometry Using Chemical Modifiers

Simultaneous preconcentration of lead and cadmium ions with methyltrioctylammonium chloride supported on microcrystalline naphthalene and determination by flame atomic absorption spectrometry

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