GDMS Analysis Of Calcium Carbonate Naturaly Doped By REE, Phospates And Other Impurities

IF 0.7 Q4 CHEMISTRY, ANALYTICAL
V. D. Kurochkin, O. Romanenko
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引用次数: 1

Abstract

A mathematical model was developed for calculation of types and intensities of molecular interferences and simulation of mass-spectra at GDMS analysis of non-conducting samples with the use of a secondary cathode. An improved design of the cell with Ta-secondary cathode were suggested enhancing the matrix to tantalum ion current ratio and sensitivity of the analysis in ca. 1.5 orders of magnitude. The model have been used for interpretation of complicate mass-spectra of calcium carbonate naturally doped with REE, phosphates and other impurities. Comparison calculated and experimental mass-spectra of VG9000 instrument demonstrates good agreement and allows select the most suitable isotopes and rejecting wrong molecular peaks. It have been shown that electrons in glow discharge plasma have different temperatures in different zones that reveals itself as separate Boltzmann populations of ionization levels for molecules, metal atoms and argon atoms/ions. Calcium carbonate is widely used for many application including as precursor for nano-hydroxyapatite synthesis. Calcium carbonate was precipitated from natural mine waters and was used as model object having high number of various impurities allowing to investigate the impact of complicate molecular ions, determine necessary resolving power of the GD-instruments to meet required detection limit.
自然掺杂稀土、磷酸盐等杂质的碳酸钙的GDMS分析
建立了一种计算分子干扰类型和强度的数学模型,并模拟了二次阴极对非导电样品进行GDMS分析时的质谱。提出了一种采用ta -二次阴极的改进设计,将基体与钽离子电流比和分析灵敏度提高了约1.5个数量级。该模型已用于解释自然掺杂稀土、磷酸盐等杂质的碳酸钙的复杂质谱。VG9000仪器的计算质谱与实验质谱的对比表明,两者吻合良好,可以选择最合适的同位素,剔除错误的分子峰。研究表明,辉光放电等离子体中的电子在不同区域具有不同的温度,这揭示了分子、金属原子和氩原子/离子电离水平的不同玻尔兹曼居群。碳酸钙作为合成纳米羟基磷灰石的前驱体有着广泛的应用。以天然矿水中沉淀的碳酸钙为模型对象,各种杂质含量高,可以研究复杂分子离子的影响,确定gd -仪器的必要分辨率以满足要求的检测限。
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来源期刊
CiteScore
1.00
自引率
14.30%
发文量
12
期刊介绍: The journal "Methods and objects of chemical analysis" is peer-review journal and publishes original articles of theoretical and experimental analysis on topical issues and bio-analytical chemistry, chemical and pharmaceutical analysis, as well as chemical metrology. Submitted works shall cover the results of completed studies and shall make scientific contributions to the relevant area of expertise. The journal publishes review articles, research articles and articles related to latest developments of analytical instrumentations.
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