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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
ABSTRACT

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.

MATERIALS
Product Number
Brand
Product Description

钨, foil, light tested, 100x100mm, thickness 0.05mm, as rolled, 99.95%
钨, foil, 100x100mm, thickness 0.125mm, as rolled, 99.95%
钨, foil, 100x100mm, thickness 0.15mm, as rolled, 99.95%
钨, foil, 100x100mm, thickness 0.1mm, as rolled, 99.95%
钨, foil, 100x100mm, thickness 0.2mm, as rolled, 99.95%
钨, foil, 100x100mm, thickness 0.3mm, as rolled, 99.95%
钨, foil, 100x100mm, thickness 0.5mm, as rolled, 99.95%
钨, foil, 100x100mm, thickness 1.0mm, as rolled, 99.95%
钨, foil, 100x100mm, thickness 2.0mm, as rolled, 99.95%
钨, foil, 150x150mm, thickness 0.125mm, as rolled, 99.95%
钨, foil, 150x150mm, thickness 0.15mm, as rolled, 99.95%
钨, foil, 150x150mm, thickness 0.1mm, as rolled, 99.95%
钨, foil, 150x150mm, thickness 0.5mm, as rolled, 99.95%
钨, foil, 150x150mm, thickness 1.0mm, as rolled, 99.95%
钨, foil, 200x200mm, thickness 0.15mm, as rolled, 99.95%
钨, foil, 200x200mm, thickness 0.1mm, as rolled, 99.95%
钨, foil, 200x200mm, thickness 0.2mm, as rolled, 99.95%
钨, foil, 200x200mm, thickness 0.3mm, as rolled, 99.95%
钨, foil, 50x50mm, thickness 0.125mm, as rolled, 99.95%
钨, foil, 50x50mm, thickness 0.15mm, as rolled, 99.95%
钨, foil, 50x50mm, thickness 0.1mm, as rolled, 99.95%
钨, foil, 50x50mm, thickness 0.2mm, as rolled, 99.95%
钨, foil, 50x50mm, thickness 0.3mm, as rolled, 99.95%
钨, foil, 50x50mm, thickness 0.5mm, as rolled, 99.95%
钨, foil, 50x50mm, thickness 1.0mm, as rolled, 99.95%
钨, foil, 50x50mm, thickness 2.0mm, as rolled, 99.95%
钨, foil, 50x50mm, thickness 3.0mm, as rolled, 99.95%
钨, foil, 0.1m coil, thickness 0.076mm, coil width 2mm, as rolled, 99.95%
钨, foil, 0.2m coil, thickness 0.016mm, coil width .36mm, as rolled, 99.95%
钨, foil, 0.2m coil, thickness 0.025mm, coil width .7mm, as rolled, 99.95%