| 优化石墨炉原子吸收光谱法测定梨中重金属元素 |
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| 引用本文： | 甘正斌,肖旭霖,孟庆辉,吕晓东.优化石墨炉原子吸收光谱法测定梨中重金属元素[J].农产品加工．学刊,2009(6). |
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| 作者姓名： | 甘正斌 肖旭霖 孟庆辉 吕晓东 |
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| 作者单位： | 陕西师范大学,食品工程与营养科学学院,陕西,西安,710062 |
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| 摘 要： | 采用石墨炉原子吸收光谱法(GFAAS)测定梨中的Cu,Cd,Pb,Mn元素。通过试验对实验参数进行了优化。在测定镉和铅时以NH4H2PO4为基体改进剂,提高了测定的灰化温度,消除了基体干扰。试验研究了灰化温度和原子化温度对吸光值的影响,试验结果表明,测定Cu,Cd,Pb,Mn元素的最佳条件为:灰化温度分别为500,300,700,900℃,原子化温度分别为2 400,1 600,2 300,2 300℃。在常压微沸下,采用HNO3—H2SO4(体积比5∶1)混酸消解梨样品。在最佳测定条件下,测得梨中的Cu,Cd,Pb,Mn含量分别为(1.264±0.135),(0.441±0.008),(0.048±0.001),(3.310±0.046)mg/kg,方法的加标回收率为96.0%~103.9%,相对标准偏差RSD为1.28%~3.05%(n=8)。试验结果令人满意,测定方法简便、快速、灵敏度高。
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| 关 键 词： | 石墨炉原子吸收光谱法 梨 重金属元素 基体改进剂 测定 |
Optimization of the GFAAS Determination of the Heavy qMetals in the Pear |
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| Can Zhengbin,Xiao Xulin,Meng Qinghui,Lv Xiaodong.Optimization of the GFAAS Determination of the Heavy qMetals in the Pear[J].Nongchanpin Jlagong.Xuekan,2009(6). |
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| Authors: | Can Zhengbin Xiao Xulin Meng Qinghui Lv Xiaodong |
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| Institution: | College of Food Engineering and Nutritrional Science;Shaanxi Normal University;Xi'an;Shaanxi 710062;China |
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| Abstract: | A method for the determination of.Cu,Cd,Pb and Mn in pears by graphite furnace atomic absorption spectrometry(GFAAS) is described.The matrix modifier NH4H2PO4 can not only enhanced the ashing temperature,but also eliminate the interference of foreign ions when determining Cd and Pb.The effect of ashing temperature and atomic temperature on absorption were studied.The experimental result showed that the optimum determination conditions of Cu,Cd,Pb,Mn were found as follows:ashing temperature were 500,300,700,... |
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| Keywords: | graphite furnace atomic absorption spectroscopy pear heavy metals matrix modifier determination |
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