ICP-AES测定滇龙胆中的硼

目的: 借鉴石墨炉原子吸收基体改进剂的原理,在样品干灰化中加入适量的Mg(NO₃)₂或者CaCl₂溶液,可使灰化温度从500 ℃提高到700 ℃而硼不挥发损失,采用电感藕合等离子体原子发射光谱仪(ICP-AES)测定。 方法: 在选定的实验条件下,以工作曲线法测定了滇龙胆(Gentiana rigescens Franch.)样品中硼含量,国家标准物质茶叶样品 及圆白菜样品 验证结果与推荐值一致。 结果: 硼的工作曲线在0~100 mg·L^-1范围内线性良好,线性回归方程为A=0.843+0.0228C,相关系数为0.999 9,检出限为0.0032 mg·L^-1,RSD小于3%,加标回收率为96.1%~102.3%。 结论: 本法用于中药滇龙胆中硼含量的分析,结果满意。

Objective: Though reference the principle of graphite furnace atomic absorption matrix modifier,by adding an appropriate amount of Mg(NO₃)₂ or CaCl₂ liquor in the sample of dry ash makes ashing temperature from 500 ℃ to 700 ℃ and boron non-volatile losses,using inductively coupled plasma atomic emission spectrometer(ICP-AES) determination. Method: Under the selected experimental conditions,we determined boron content in the samples of Gentiana rigescens Franch. ,the national standard materials of tea samples and the cabbage samples ) verify the results in line with the recommended values. Results: Linear regression equation was A = 0.843 +0.0228C,with correlation coefficient of 0.9999,while the detection limit was 0.0032 mg·L^-1,the relative standard deviation was less than 3%,and the recovery was 96.1%－102.3%. Conclusion: This method is applied to the determination of boron content in Gentiana rigescens Franch.with satisfactory results.