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Determination of lanthanum in food and water samples by Zeeman-effect atomic absorption spectrometry using graphite tube lined with tungsten foil.

Determination of lanthanum in food and water samples by Zeeman-effect atomic absorption spectrometry using graphite tube lined with tungsten foil.

The Analyst (1992-02-01)

S Miao-Kang, S Yin-Yu

摘要

A sensitive, selective method for the determination of lanthanum in food and water samples by atomic absorption spectrometry using a graphite tube lined with tungsten foil is described. The atomization of lanthanum from the tungsten surface gives better analytical sensitivity, a lower atomization temperature and negligible memory effects. The characteristic mass and detection limit of the method were 8.1 x 10(-9) and 7.85 x 10(-9) g, respectively. The precision (relative standard deviation in the range 5.9-9.9%), accuracy and interferences of the method were also investigated. The method can be used directly for the determination of trace amounts of lanthanum in food and water without pre-dissociation of the matrices. The results obtained by this method are in good agreement with those obtained from inductively coupled plasma atomic emission spectrometry.

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钨, foil, 200x200mm, thickness 0.3mm, as rolled, 99.95%

钨, foil, light tested, 150x150mm, thickness 0.025mm, as rolled, 99.95%

钨, foil, 100x100mm, thickness 0.2mm, as rolled, 99.95%

钨, foil, light tested, 25x25mm, thickness 0.02mm, 99.95%

钨, foil, 100x100mm, thickness 0.15mm, as rolled, 99.95%

钨, foil, 50x50mm, thickness 0.2mm, as rolled, 99.95%

钨, foil, 0.5m coil, thickness 0.035mm, coil width .5mm, as rolled, 99.95%

钨, foil, 100x100mm, thickness 0.125mm, as rolled, 99.95%

钨, foil, 100x100mm, thickness 0.1mm, as rolled, 99.95%

钨, foil, 0.2m coil, thickness 0.035mm, coil width 1.5mm, as rolled, 99.95%

钨, foil, 1m coil, thickness 0.025mm, coil width 1mm, as rolled, 99.95%

钨, foil, not light tested, 25x25mm, thickness 0.005mm, 99.95%

钨, foil, 150x150mm, thickness 0.125mm, as rolled, 99.95%

钨, foil, 50x50mm, thickness 0.5mm, as rolled, 99.95%

钨, foil, not light tested, 25x25mm, thickness 0.008mm, 99.95%

钨, foil, 100x100mm, thickness 0.5mm, as rolled, 99.95%

钨, foil, 150x150mm, thickness 1.0mm, as rolled, 99.95%

钨, foil, 50x50mm, thickness 3.0mm, as rolled, 99.95%

钨, foil, 0.2m coil, thickness 0.076mm, coil width 2mm, as rolled, 99.95%

钨, foil, 1m coil, thickness 0.035mm, coil width 1.5mm, as rolled, 99.95%

钨, foil, light tested, 150x150mm, thickness 0.05mm, as rolled, 99.95%

钨, foil, light tested, 25x25mm, thickness 0.015mm, 99.95%

钨, foil, light tested, 25x25mm, thickness 0.01mm, 99.95%

钨, foil, light tested, 25x25mm, thickness 0.025mm, as rolled, 99.95%

钨, foil, 100x100mm, thickness 0.3mm, as rolled, 99.95%

钨, foil, 150x150mm, thickness 0.15mm, as rolled, 99.95%

钨, foil, 150x150mm, thickness 0.5mm, as rolled, 99.95%

钨, foil, 200x200mm, thickness 0.2mm, as rolled, 99.95%

钨, foil, 50x50mm, thickness 0.3mm, as rolled, 99.95%

钨, foil, 0.2m coil, thickness 0.016mm, coil width .36mm, as rolled, 99.95%