共查询到19条相似文献,搜索用时 93 毫秒
1.
2.
在无稳定剂条件下直接用蒸馏水制成菠菜样品的悬浮液,用SrCl2和CsCl消除相关干扰,在磁力搅拌下进样,应用标准曲线法在同一溶液中利用空气-乙炔火焰原子吸收光谱法测定Zn、Mn、K、Ca等4种元素含量。结果表明,菠菜中富含Zn、K、Ca及Mn。以无刺种菠菜叶样品为例,详细研究了干扰及其消除的条件,考察了方法的准确度和精密度。试验表明,在选定的条件下,菠菜中各元素间相互不干扰测定。方法的加标回收率在90.5%~101.5%之间,相对标准偏差在0.2%~1.1%之间(n=3),测定结果准确可靠。 相似文献
3.
4.
5.
采用悬浮液进样火焰原子吸收光谱法(FAAS法)测定土壤样品中微量锰;并对样品的粒度、悬浮液的浓度、介质酸度、校正方法及抗干扰等进行了探讨。结果表明,本法简便、快速、准确可靠。 相似文献
6.
7.
8.
本文建立了火焰原子吸收光谱法测定土壤样品中四价锰的分析方法。实验优化了提取剂硫酸镁的浓度、溶液酸度等实验条件,方法检出限为0.11ug/m l,线性相关系数R2=0.9996,相对标准偏差RSD%为2.25%,回收率在95.7%~104.0%之间,结果令人满意,并已成功应用于诸多地质样品分析中。 相似文献
9.
微乳液进样火焰原子吸收法测定异辛酸钴中的微量镍,锰 总被引:2,自引:0,他引:2
建立了微乳液直接进样火焰原子吸收光谱法测定微量镍、锰的方法,确定了仪器工作条件和稳定微乳液的形成条件,用于异辛酸钴中微量镍、锰的测定,取得了满意的结果。该法具有简便、快速、准确的特点。 相似文献
10.
悬浮液进样石墨炉原子吸收光谱法测定饲料样品中痕量铜 总被引:2,自引:0,他引:2
采用悬浮液进样技术并结合灵敏度较高的石墨炉原子吸收光谱法测定饲料样品中的痕量铜,对悬浮液介质、基体改进剂进行了选择,对灰化和原子化过程进行了探讨,本法的精密度(RSD)为4.12%,加标收回率为97.0%。 相似文献
11.
12.
13.
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
14.
15.
16.
This paper reports the development of a method for the determination of copper and iron in jet fuels employing the electrothermal atomic absorption spectrometry (ETAAS). In order to allow the direct determination of the analytes, the samples were injected into the graphite furnace as detergent emulsions in order to avoid their volatilization during analysis. The results obtained in this work indicated that a stable emulsion can be formed by mixing 1 mL of a 7% m/v Triton X-100 solution containing 10% v/v HNO3 with 4 mL of jet fuel. The injection of emulsions provided integrated absorbance signals with suitable sensitivity and precision for 300 min at least. The addition of chemical modifier was not necessary because background values were always very low, allowing the use of pyrolysis temperature around 1000 °C for both analytes. Both Triton X-100 and HNO3 concentrations in the solution used to form the emulsion had remarkable influence on the sensitivity as well as the heating rate employed in the drying step. Under the best conditions established in the present work, limits of detection of 0.50 and 0.46 μg L−1 were observed for copper when oil-based and aqueous standards were added to the emulsions for calibration, respectively. For iron, the limits of detection were 0.88 and 0.90 μg L−1 for oil-based and aqueous standards, respectively. The method was applied in the determination of Cu and Fe in five samples of jet fuels and a recovery test was performed, producing recovery percentages between 95% and 105%. 相似文献
17.
18.
19.
考察了用火焰原子吸收光谱法测定废催化剂中铂的测定条件和消除干扰的方法,测定结果表明:在波长为265.9nm,灯电流为8mA,光谱通带宽度为0.4nm,燃烧器高度为8mm的条件下,测定的回收率达99 2%~103 0%,相对标准偏差≤2.4%。方法的准确度和精密度良好。 相似文献