Determination of tungsten and molybdenum at low levels in geological materials by inductively coupled plasma mass spectrometry

Hall, G.E.M.; Park, Chang J.; Pelchat, Jean-Claude

doi:10.1039/ja9870200189

Cited by 43 publications

(25 citation statements)

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“…Molybdenum oxide ions overlap all the major isotopes of Cd, which complicates measurement of Cd in a Mo matrix by ICP-MS (32). Table 4 shows the isotope ratios obtained for Cd at 200 ^ig L"1 in 100 mg L"1 Mo.…”

Section: Removal Of Metal Oxidesmentioning

confidence: 99%

“…Special operating conditions (22)(23)(24)(25)(26), flow injection (26)(27)(28), dilution of samples (20,24,29,30), internal standards or isotope dilution (14,16,17,24,(31)(32)(33)(34), matrix matching (35,36), and standard addition (37) can all be used to cope with such effects. The most satisfactory method for some matrices, however, may be to separate the analytes from the matrix using techniques such as ion exchange separation or co-precipitation (38)(39)(40)(41)(42)(43)(44).…”

Section: General Introductionmentioning

confidence: 99%

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Reduction of polyatomic ion interferences in inductively coupled plasma mass spectrometry by cryogenic desolvation

Alves¹,

Wiederin²,

Houk³

1992

Anal. Chem.

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Multiple desolvatlon steps at -80 °C for a continuous-flow ultrasonic nebulizer reduced the load of water and HCI on an argon inductively coupled plasma (ICP). Consequently, the oxide ratios MO+/M+ for Ca, Mo, and La were 0.02-0.05%.Polyatomic Ion Interferences from ArO+, CIO+, and ArCI+ were also reduced by several orders of magnitude. Measured Isotope ratios for Nl, Cd, and Fe were In good agreement with accepted natural values, and the detection limits were 2-20 ng L'1 for Nl, Fe, V, As, and Cd In the presence of concentrated matrices of HCI, Ca, or Mo that would normally cause polyatomic Ion Interference. Eight additional seconds were necessary for sample rinse-out, and analyte sensitivity was reduced by a factor of 2 when cryogenic desolvatlon was used. UO+/U+ ratios were reduced to 0.06% when cryogenic desolvatlon was used and acetylene was added to the central channel. Sodium matrices up to 100 mg L1 decreased the La+ count rate but did not affect the oxide ratio LaO+/La+. At 1000 mg L~1 NaCI the LaO+/La+ ratio Increased to 0.08%.

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Section: Removal Of Metal Oxidesmentioning

confidence: 99%

Section: General Introductionmentioning

confidence: 99%

Reduction of polyatomic ion interferences in inductively coupled plasma mass spectrometry by cryogenic desolvation

Alves¹,

Wiederin²,

Houk³

1992

Anal. Chem.

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“…4,5) Furthermore, it enables very rapid isotope ratio determination, which in turn makes isotope dilution technique [6][7][8] possible. The isotope dilution technique is not affected by the recovery rate of analyte during the analytical process and by the drift of measurement of ICP-MS.…”

Section: Introductionmentioning

confidence: 99%

Determination of Trace Amounts of Antimony and Boron in High-Purity Iron and Steel by Isotope Dilution/Inductively Coupled Plasma Mass Spectrometry

2002

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The highly sensitive and precise determination method for trace amounts of Sb and B in high-purity iron and steel has been established by the isotope dilution/Inductively coupled plasma mass spectrometry. For the determination of Sb, the iron matrix was separated by anion-exchange chromatography using Dowex I-X8 in hydrofluoric acid solution, and the isotope ratio ( 121 Sb/ 123 Sb) of the HNO 3 /H 2 O 2 eluate was measured by ICP-MS. The isobaric interference of 123 Te was corrected by subtracting the intensity of 123 Te obtained by the relative intensity of 123 Te and 125 Te. For the determination of B, after the treatment of sulfuric acid-phosphoric acid fuming for the complete decomposition of boron nitride, B was separated by the anion-exchange chromatography using Amberlite IRA-743 at pH 8. The CyDTA was added to prevent the hydrolysis of iron. The isotope ratio ( 11 B/ 10 B) of the HCl eluate was measured by ICP-MS. By these methods, Sb and B in the range of µg/g to sub-µg/g could be determined with good precision. The limit of detection is 5.8 ng/g for Sb and 16 ng/g for B in steel.

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“…9,10 Atomic absorption spectrometry (AAS) is being increasingly used for the determination of trace amount of metals in ores, minerals and rocks. 11,12 Besides, X-ray fluorescence (XRF) analysis, neutron activation analysis (NAA), inductively coupled plasma atomic emission spectroscopy (ICP-AES) and sepctrophotometry have also been applied for such analyses.…”

Section: Introductionmentioning

confidence: 99%

“…9,10 Atomic absorption spectrometry (AAS) is being increasingly used for the determination of trace amount of metals in ores, minerals and rocks.…”

mentioning

confidence: 99%

Voltammetric Trace Analysis of Uranium and Other Metals in Meta Rhyolite Rock Samples

Tamrakar

Pitre

2000

ANAL. SCI.

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Uranium metal is inhomogeneously distributed in nature. The recovery of uranium from the earth's crust has been gaining much attention in recent years because of its ever-increasing demand in nuclear technology. It has been determined in different materials viz. ores, rocks, minerals and seawater etc. by several research workers. [1][2][3][4] It occurs in rock materials at minor and trace levels. In meta rhyolite rock, uranium is present at a trace level, and is generally associated with Th, Cs, Fe, Mn, Cu, Si, An analysis of uranium in natural origin (geological) samples is necessary not only in view of its significance for nuclear technology and economic value, but also for its environmental significance. Due to the importance of uranium and other metals, it is desirable to use an analytical technique that is highly sensitive especially at trace levels, specific, precise and yields much elemental information, even for a small sample.Various analytical procedures based on the use of different instrumental techniques have been developed in the past for the determination of uranium and other trace metals in geological samples. 9,10 Atomic absorption spectrometry (AAS) is being increasingly used for the determination of trace amount of metals in ores, minerals and rocks. 11,12Besides, X-ray fluorescence (XRF) analysis, neutron activation analysis (NAA), inductively coupled plasma atomic emission spectroscopy (ICP-AES) and sepctrophotometry have also been applied for such analyses. [13][14][15][16] In the field of the trace analysis of metals, electroanalytical techniques have established themselves as versatile analytical tools for their quick and precise determination. With the development of several advanced electroanalytical techniques, such as differential pulse polarography (DPP), differential pulse anodic stripping voltammetry (DPASV) and adsorptive stripping voltammetry etc., problems related to the simultaneous multielemental determination of metals in different origin samples including geological samples have been simplified. 17,18 The sensitivity of anodic stripping voltammetry has been greatly improved by using a thin mercury film on a glassy carbon fiber electrode 19 and a gold film electrode. 20 Currently, voltammetry and related techniques have emerged as powerful tools for the rapid and simultaneous qualitative and quantitative determination of trace metals in a variety of samples of biological, environmental, metallurgical, industrial and geological origin. 21-25The present paper deals with the application of DCP, DPP and DPASV for the trace analysis of metals in meta rhyolite rock samples. Special attention was paid to the uranium content of the sample. The voltammetric results were compared with those obtained using AAS and XRF methods. Experimental SampleThe meta rhyolite rock sample was collected from Ghatwari village near Kherli Bazar area, located 21 km north east of Multai Tehsil, Betul District, (M. P.) India. ApparatusPolarographic and voltammetric measurements were made on an Elico (Indi...

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Determination of tungsten and molybdenum at low levels in geological materials by inductively coupled plasma mass spectrometry

Cited by 43 publications

References 1 publication

Reduction of polyatomic ion interferences in inductively coupled plasma mass spectrometry by cryogenic desolvation

Reduction of polyatomic ion interferences in inductively coupled plasma mass spectrometry by cryogenic desolvation

Determination of Trace Amounts of Antimony and Boron in High-Purity Iron and Steel by Isotope Dilution/Inductively Coupled Plasma Mass Spectrometry

Voltammetric Trace Analysis of Uranium and Other Metals in Meta Rhyolite Rock Samples

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