Determination of Three Kinds of Trace Elements in the Milk Powder by MPT -AES

Abstract

Abstract:

The determination of calcium , iron and zinc in the milk powder by microwave plasma torch atomic emission spectrometry (MPT-AES)with the standard curve method w as studied by using microwave plasma torch(MPT)as ex citation light source, argon as support gas of pasma and sample solution being introduced into a pneumatic atomizer system .The effect of experimental co nditions including hydrochloric acid concentration in the sample solution, nitric acid concentration in the sampl solution, microw ave forward power , carrier g as flow rate, support gas flow rate on determination w ere optimized.The effect of co -ionized elements of sodium and magnesium on the emission intensity of calcium , iron and zinc w as investiga ted in detail .The detection limits of mass concentration for calcium , iron and zinc are 0.92 , 13.82 and 16 .27 μg/ L, respectively .The relative standard deviations (n =6)are less than 1 .79%. The linear rang es are 0.02 ～ 6, 0 .1 ～ 100, 0.1～ 20 mg/ L for calcium , iron and zinc , respectively .The results show that the proposed method is effective for the determination of the quality of calcium , iron and zinc in the milk powder in its accuracy , easy operation,high automation , low operation cost and rapidity .

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Key words: Atomic emission spectrometry , , Milk pow der , , Calcium , , Iron , , Zinc

摘要： 用微波等离子体(MPT)为激发光源, 氩气为等离子体工作气体, 用气动雾化进样, 采用标准曲线法研究了微波等离子体炬原子发射光谱法(MPT -AES)测定奶粉中Ca 、Fe 、Zn 的方法。详细考察了溶液中HCl 的浓度、HNO3 的浓度、微波前向功率、载气流量、工作气流量等实验参数对测定的影响, 同时考察了共存元素Na 、Mg 对Ca、Fe 和Zn 发射强度的影响。测定Ca 、Fe 、Zn 质量浓度的检出限分别为0 .92、13 .82、16 .27 μg/ L, RSD(n=6)≤1.79 %, 并且测得它们的线性范围分别为0.02 ～ 6 、0.1 ～ 100、0 .1 ～ 20 mg/ L。结果表明, MPT -AES 测定奶粉中的Ca、Fe 和Zn 操作简便, 自动化程度高, 运转费用低, 准确快速, 是一种奶粉质量检测行之有效的分析方法。

关键词: 原子发射光谱法, , 奶粉, , 钙, , 铁, , 锌

ZHANG Dan,LI Li -hua,ZHANG Jin -sheng，et al. Determination of Three Kinds of Trace Elements in the Milk Powder by MPT -AES[J]. Journal of Liaoning Petrochemical University, 2005, 25(1): 30-32.

张　丹, 李丽华, 张金生,等. MPT -AES 测定奶粉中的三种微量元素[J]. 辽宁石油化工大学学报, 2005, 25(1): 30-32.

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Determination of Three Kinds of Trace Elements in the Milk Powder by MPT -AES

MPT -AES 测定奶粉中的三种微量元素

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