Determination of lanthanum in food and water samples by Zeeman-effect atomic absorption spectrometry using graphite tube lined with tungsten foil.
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.
Miao-Kang
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Hangzhou Health and Anti-Epidemic Station, People's Republic of China.
Yin-Yu
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D005504:Food Analysis / Q000379:methods*; D006108:Graphite; D006851:Hydrochloric Acid; D007811:Lanthanum / Q000032:analysis*; D011786:Quality Control; D013054:Spectrophotometry, Atomic / Q000379:methods*; D014414:Tungsten; D014867:Water / Q000737:chemistry*
D014867:Water; D007811:Lanthanum; D006108:Graphite; D006851:Hydrochloric Acid; D014414:Tungsten