Ion-Selective Electrode Determination of Calcium and Potassium in Bovine Skim-Milk Powder
作者:
I.K. Al Hitti,
J.D. R. Thomas,
期刊:
Analytical Letters
(Taylor Available online 1985)
卷期:
Volume 18,
issue 8
页码: 975-983
ISSN:0003-2719
年代: 1985
DOI:10.1080/00032718508066192
出版商: Taylor & Francis Group
关键词: Milk powder;ion-selective electrodes;metal ions in milk powder
数据来源: Taylor
摘要:
Ion-selective electrode determinations of potassium and calcium have been carried out on skim milk powder and the results compared with data obtained by flame emission spectroscopy for potassium and by atomic absorption spectroscopy for calcium. The data indicate that ion-selective electrodes can be used as an alternative to spectroscopic methods for determining these metals by using a dry-ashing pretreatment procedure. Acid digestion pretreatment is not recommended because of the ensuing high ionic strength and possible interferences. Sodium and magnesium contents obtained by spectroscopy are also quoted for interest. The various percentage metal contents are: potassium: 1.96 ± 0.155 (ISE direct) 1.81 ± 0.144 (ISE Gran) and 1.82 ± 0.076 (flame emission), sodium: 0.511 ± 0.017 (flame emission), calcium: 1.37 ± 0.095 (ISE direct), 1.36 + 0.079 (ISE Gran) and 1.41 ± 0.082 (flame aas), and magnesium 0.119 ± 0.003 (flame aas).
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