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石墨炉原子吸收光谱法测定茶叶中铅 总被引:1,自引:0,他引:1
目的:探讨茶叶中铅的检测方法,并用该法测定10个样品(含2个标准样品)的Pb含量。方法:应用基体改进剂,用石墨炉原子吸收光谱法测定茶叶中铅。结果:(1)茶叶中Pb含量的测定适宜条件为:磷酸二氢铵作为基体改进剂,灰化温度700℃,原子化温度2000℃;(2)本法铅的检出限为1.1μg.L-1,回收率为94.0%~108.8%;(3)抽检的市售8种茶叶种有2种铅含量大于5mg.kg-1。结论:该法准确灵敏,回收率好,可满足实际检测要求。 相似文献
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采用石墨炉原子吸收光谱法测定功能纤维中微量钛,探讨了其操作条件,并建立了分析方法。结果表明:采用干法消化处理试样,在狭缝宽0.2 nm,检测波长364.3 nm,关闭氘灯状态下,采用干燥阶段120℃、50 s,灰化阶段550℃、15 s,1 200℃、15 s,原子化阶段2 550℃、4 s,清除阶段2 700℃、6 s的阶梯升温程序测定功能纤维中的微量钛,其检出极限100~2 000μg/L,回收率97%,相对标准偏差0.67%。 相似文献
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采用石墨炉原子吸收光谱法测定马铃薯中铬含量,采用了一种新的前处理方法(硝酸+硫酸+过氧化氢)的湿法消解法,并与传统湿法消解法(硝酸+高氯酸)作对比。结果表明,新的湿法消解法测得铬的含量略高于传统消解法测得铬的含量,加标回收率在92.7%~99.2%,精密度RSD为1.713 5%,都优于传统的湿法消解法,避免了危险性较大的高氯酸,且反应温和,操作安全,简单,消解完全,结果准确,可以作为选择方法在实际工作中应用推广。 相似文献
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分析了原子吸收法测定汽油铅含量时分析线、灯电流、燃烧器高度及燃气/助燃气比等操作条件对分析结果准确性的影响,并确定了最佳操作条件 相似文献
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本文研究了硫化物沉淀分离富集原子吸收法分析微量锑的方法。最低分析浓度为 0 0 8mg·L-1,加标回收率为 91%~ 10 8% ,相对标准偏差为 3 0 %~ 4 1%。此法快速、准确。 相似文献
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冷原子吸收光谱法测定磷复肥中的汞 总被引:2,自引:0,他引:2
建立了磷复肥中汞含量的测定方法。试样经混酸溶解,在酸性介质中采用冷原子吸收光谱法测定试液中的汞含量。本方法建立的线性方程相关系数r=0.9997,加标回收率在98.75%~108.26%。 相似文献
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Janyeid Karla Castro Sousa Allan Nilson de Sousa Dantas Aldaléa Lopes Brandes Marques Gisele Simone Lopes 《Fuel Processing Technology》2008
The aim of this work was to develop an experimental design to optimize the direct determination of copper in gasoline by graphite furnace atomic absorption spectrometry. The optimization of the process was carried out firstly by evaluating the variables in the procedure (pyrolysis time and temperature, atomization temperature and sample volume) using a factorial design (24). The response surface was constructed and it presented pyrolysis optimal temperature on 800 °C, sample volume of 30 μL using the atomization temperature of 2500 °C. The amount of copper in the gasoline samples from São Luis City (Brazil) varied from 3.65 to 16.21 μg L− 1, with 0.65 and 1.9 μg L− 1 as detection limit and quantification limit, respectively. Accuracy was evaluated by a comparative procedure and the results proved the viability of copper direct determination in fuel samples. 相似文献
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火焰原子吸收光谱法测定紫菜中铜的研究 总被引:1,自引:0,他引:1
建立了非完全消化-火焰原子吸收光谱法测定紫菜中铜的方法,样品在低温下用高氯酸:硝酸(V:V=1:3)混合酸消解,再用20%的OP乳化剂溶液溶解消解过程中产生的油脂,配制成均匀、透明的样品溶液。同时制备空白溶液。用标准曲线法测定,本法相对标准偏差为2.72%,回收率为98.7%~106.8%。方法检出限(3σ)为0.0015μg/mL。将该法与灰化法进行了比较,结果表明无显著性差异。 相似文献
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介绍一种饲料级磷酸氢钙中微量铅的测定方法。用盐酸溶液溶解后的试样,在HCl-K3Ye(CN)6-NaBH。反应体系中,采用氢化物发生原子吸收光谱法测定铅含量。本方法相关系数r=0.9987,加标平均回收率范围在98.45%~100.75%. 相似文献
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Ricardo J. Cassella Daniel M. BrumClaudio F. Lima Teresa Cristina O. Fonseca 《Fuel Processing Technology》2011,92(5):933-938
The present work reports the development of a method for the determination of lead in aviation gasoline samples by electrothermal atomic absorption spectrometry (ETAAS). The samples were emulsified before injecting into the spectrometer in order to avoid the high instability observed in the signals when the samples were injected directly without any treatment. Stable detergent emulsions were obtained by mixing 1 mL of a 7% m/v Triton X-100 solution containing 10% v/v HNO3 with 4 mL of aviation gasoline. These emulsions generated constant integrated absorbance signals for 5 h at least. Several parameters related to the emulsion formation (Triton X-100 and HNO3 concentrations) and temperature program (pyrolysis and atomization temperatures and heating rate and the final temperature of the drying step) were evaluated. Both Triton X-100 and HNO3 concentrations in the solution used to form the emulsion influenced the sensitivity of the lead measurements as well as the heating rate utilized in the drying step. The use of a chemical modifier was necessary, being that the Pd conventional modifier presented better performance than the permanent Ir modifier. The limits of detection and quantification derived for the methodology were 1.2 and 4.0 μg L− 1. Six samples of aviation gasoline were analyzed and the lead concentrations varied between 11.6 and 64.2 μg L− 1. A recovery test was performed in order to attest the accuracy of the procedure and recovery percentages between 88 and 112% were observed. 相似文献
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基体改进剂石墨炉原子吸收测定发镉的研究 总被引:1,自引:0,他引:1
探讨石墨炉原子吸收检测发镉的基体干扰,选择适宜的基体改进剂建立一种测定发镉的新方法。样品经前处理后,分别加入单种基体改进剂和不同组合基体改进剂,用石墨炉原子吸收测定样品及加标样品,通过加标回收率筛选出测定发镉的优良基体改进剂。研究得出测定发镉的最佳基体改进剂为硝酸铵-抗坏血酸-硝酸镧混合基体改进剂。在0.219 4~11.236 1 ng/mL的范围内,镉原子吸光强度与其含量有良好的线性关系,标准曲线y=0.060+0.017 3ρ(ng/mL),r=0.999 8,相对标准偏差为2.9%~5.7%,方法的检出限为0.131 7 ng/mL,平均回收率94.5%。该方法简便易行、灵敏度高、选择性好、准确度高,测定结果令人满意。 相似文献
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