共查询到18条相似文献,搜索用时 78 毫秒
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采用氢化物发生原子荧光光谱法测定了头发中微量镉。样品用硝酸-高氯酸消化,用30 g/L的硼氢化钾作还原剂,在0.11 mol/L的硫酸介质中测定,方法的检出限为0.08 ng/mL,方法的精密度为1.21%,回收率为96%~110%。 相似文献
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流动注射-氢化物发生-原子荧光光谱法测定天然水中痕量镉 总被引:2,自引:0,他引:2
基于编结反应器,提出了流动注射-氢化物发生-原子荧光光谱法测定水中痕量镉含量的方法。样品与氨水-氯化铵缓冲溶液在线混合,产生的沉淀收集到编结反应器内壁,引入空气除去编结反应器内残留的溶液,泵入盐酸(3+97)溶液溶解沉淀,与硼氢化钾合并后用原子荧光光谱仪测定。在优化的试验条件下,当样品消耗15.6mL时,富集倍数为14倍,方法检出限(3S/N)为2.9ng.L-1,相对标准偏差(n=11)为3.4%。方法用于国家标准物质和天然水样中痕量镉的测定,测定值与标准值相符,天然水样的回收率在91.5%~107.5%之间。 相似文献
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氢化物发生-原子荧光光谱法测定绞股蓝中痕量铋 总被引:7,自引:0,他引:7
研究了氢化物发生-原子荧光光谱法测定中草药绞股蓝中痕量铋的适宜条件,试验了不同的消解方式、酸介质和还原剂用量对测定铋的影响。在最佳测定条件下,铋的线性范围为0.1~200μg.L-1,检出限为0.095μg.L-1。样品分析结果的相对标准偏差为4.28%(n=6),加标平均回收率为99.5%。 相似文献
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采用氢化物发生-原子荧光光谱法测定钢铁中的痕量铋。考察了观察高度、负高压、灯电流、载气流速、屏蔽气流速、介质酸度、载流酸度和硼氢化钾浓度等因素对测定结果的的影响,并优化了测定条件,研究了钢铁材料中常见元素对铋测定的影响。结果表明,用硫脲和抗坏血酸作抑制剂可以消除大量元素的干扰。铋浓度在0~100ng/mL与荧光强度呈良好的线性关系,方法的检出限为0.187ng/g。对20ng/mL的铋标准溶液平行测定10次,相对标准偏差为2.5%。用该方法对国家标准钢样品进行了测定,测定结果与标准值相符合。 相似文献
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顺序注射氢化物发生-原子荧光光谱法同时测定中草药中铋和汞 总被引:1,自引:0,他引:1
建立了一种顺序注射氢化物发生-原子荧光光谱法测定中草药中的Bi和Hg的方法,讨论了共存离子的干扰情况。在最佳实验条件下,Bi和Hg的检出限分别为0.0057μg/L和0.0197μg/L,加标回收率为93.4%~104.7%,相对标准偏差小于4.3%,被测中草药试样中共存的离子对Bi和Hg的测定没有干扰。方法可用于中草药试样中Bi和Hg的同时测定。 相似文献
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P Smrkolj 《Analytica chimica acta》2004,512(1):11-17
A digestion mixture of H2SO4/HNO3/H2O2/HF/V2O5 was investigated for decomposition of plant samples and sensitive detection of selenium was achieved by hydride generation atomic fluorescence spectrometry (HG-AFS). The method was found to be accurate and reproducible, with a low detection limit (DL) (0.14 ng g−1 solution). The repeatability of the determination was mostly around 10%, the reproducibility over a period of 8 months for determination of selenium in the standard reference material Trace Elements in Spinach Leaves, NIST 1570a, was 9% and the relative measurement uncertainty was 7% using a coverage factor of 2.3 at 95% probability. The average recovery of the whole procedure was 90%. The characteristics of this method are simple and inexpensive equipment, low consumption of chemicals and the ability to analyse many samples in a short time. The whole procedure was carried out in the same PTFE tube, and in addition only a simple cleaning procedure is needed. As a consequence of all these advantages, the described method is suitable for environmental and nutritional studies. The selenium content was determined in 44 vegetable samples from different regions of Slovenia and the contents found were in the range 0.3-77 ng g−1 wet weight. 相似文献