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用硝酸-过氧化氢(3+2)混合溶液作为消解剂,微波消解法处理桄榔粉样品,采用电感耦合等离子体-原子发射光谱法(ICP-AES)同时测定所得样品溶液中锌、铁、钙、镁、锰、铜、钾和钠的含量。选择谱线(nm)Zn:213.8、Fe:239.5、Ca:317.9、Mg:280.2、Mn:257.6、Cu:224.7、K:766.4、Na:589.5等进行测定。所有元素校准曲线的相关系数均大于0.9997;该方法线性范围(μg.mL-1)Zn、Cu:0.0—2.0,Fe:0.0—10.0,Ca:0.0—60.0,Mg:0.0—40.0,Mn:0.0—5.0,K:0.0—80.0、Na:0.0—20.0;检出限(3Sd,μg.mL-1)为Zn:0.001、Fe:0.025、、Ca:0.020、Mg:0.001、Mn:0.002、Cu:0.006、K:0.069、Na:0.022;样品测定的相对标准偏差(n=6)在0.45%—9.05%之间。用本法测定4个国家标准物质大米粉GBW(E)080684、小麦GBW10011、玉米GBW10012和苹果GBW10019,测定值与标准值相吻合。
The sugar cane powder samples were treated by microwave digestion method with nitric acid-hydrogen peroxide (3 + 2) mixed solution as the digestion agent, and the contents of zinc and iron in the obtained sample solution were simultaneously determined by inductively coupled plasma atomic emission spectrometry (ICP-AES) , Calcium, magnesium, manganese, copper, potassium and sodium content. Zn: 213.8, Fe: 239.5, Ca: 317.9, Mg: 280.2, Mn: 257.6, Cu: 224.7, K: 766.4, and Na: 589.5 were selected for measurement. The correlation coefficients of all the elemental calibration curves were all greater than 0.9997. The linear range (μg.mL-1) of Zn, Cu: 0.0-2.0, Fe: 0.0-10.0, Ca: 0.0-60.0, Mg: The detection limit (3Sd, μg.mL-1) was Zn: 0.001, Fe: 0.025, Ca: 0.020, Mg: 0.001, Mn: 0.002, Cu: 0.006, K: 0.069, Na: 0.022; The relative standard deviations (n = 6) for the samples were between 0.45% and -9.05%. Using this method to determine the four national standards of rice flour GBW (E) 080684, wheat GBW10011, corn GBW10012 and apple GBW10019, the measured value and the standard values are consistent.