Ion-Selective Electrode Determination of Calcium and Potassium in Bovine Skim-Milk Powder
Ion-Selective Electrode Determination of Calcium and Potassium in Bovine Skim-Milk Powder
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DOI：
10.1080/00032718508066192
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发表时间：
1985
影响因子：
2
通讯作者：
I. K. A. Hitti;J. D. Thomas
中科院分区：
文献类型：
--
作者：
I. K. A. Hitti;J. D. Thomas
用离子选择电极法测定脱脂奶粉中的钾和钙，并与火焰发射光谱分析钾和原子吸收测定钙的结果进行了比较。这些数据表明，离子选择电极可以替代光谱方法，通过干法灰化前处理程序来测定这些金属。不建议采用酸消解前处理，因为这样会产生高离子强度和可能的干扰。此外，还引用了通过光谱分析获得的钠和镁含量。金属含量的百分比分别为：钾：1.96±0.155(ISE直接)1.81±0.144(火焰发射)和1.82±0.076(火焰发射)，钠：0.511±0.017(火焰发射)，钙：1.37±0.095(ISE直接)，1.36±0.079(ISE GRAN)和1.41±0.082(火焰原子吸收)，镁0.119±0.003(火焰原子吸收)。
Abstract 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).