共查询到19条相似文献,搜索用时 218 毫秒
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植物性样品中重金属元素用火焰原子吸收法测定 总被引:4,自引:0,他引:4
本文采用扩大样品处理量,用稀硝酸润湿──炭化——高温灰化方法进行样品预处理,空氧一乙炔火焰直接测定溶液,氘灯扣除背景吸收原子吸收法,测定植物性食物中锌、铜、铁、锰、镉、铅元素的含量。平均回收率:锌 108%、铜 99%、铁 118%、锰98%、镉97%、铅 98%相对标准偏差:锌2.02%、铜11.24%、铁12.41%、锰1.27%、镉6.90%、铅7.03% 相似文献
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本实验以流产胎儿骨骼为样品经硝酸、氢氟酸、高氯酸消解,将试液定容至50毫升容量瓶中,试液中的钙、镁用火焰原子吸收测定;试液中的铜、锰用螯合树脂富集-火焰原子吸收测定.本方法的检测限Ca0.004mg/L、Mg 0.001mg/L、Cu 0.00014mg/L、Mn 0.0003mg/L. 相似文献
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原子吸收光谱法测定大气降尘中的重金属 总被引:1,自引:0,他引:1
本文使用双氧水和硝酸消解样品,火焰原子吸收法和石墨炉原子吸收法测定样品中重金属铜、铅、镉、铁含量。实验发现该方法简单、快捷,能很好满足要求,是广泛采用。 相似文献
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简要介绍高分辨连续光源原子吸收光谱仪(HS-CS-AAS)的基本特点,并利用HS-CS-AAS同时测定水系沉积物中的铜、铅、镉、锰微量元素。结果表明,测定国家标准样品和实际样品的加标回收率铜为96.2%~100.9%;铅为95.2%~102.0%;镉为91.2%~105.7%;锰为93.1%~99.9%。相对标准偏差(RSD,n=7)铜、铅、镉、锰分别为0.1 0%~2.90%,0.40%~3.50%,0.25%~4.90%,0.50%~2.0%。 相似文献
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火焰原子吸收法测定空气与废气中的铅 总被引:1,自引:0,他引:1
采用火焰原子吸收法测定了空气与废气中铅尘和铅烟气溶胶中的铅。对四种消解方法作了比较。讨论了酸度及样品基体干扰影响。测定结果令人满意。铅的检出限为0.05mg/L,线性范围0.5-10.0mg/L,采样效率为98%,样品回收率为92.3%。 相似文献
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石墨炉原子吸收法测定海水中痕量铜、铅、镉、镍,方法的特征浓度(1%吸收)分别为铜:0.808μg/L、铅:1.20μg/L、镉:0.063 7μg/L、镍:1.12μg/L,最低检出限分别为铜:0.24μg/L、铅:0.36μg/L、镉:0.019μg/L、镍:0.34μg/L。室内控样测试结果的相对误差分别为铜:3.5%、铅:0.8%、镉:4.2%、镍:4.9%,相对标准偏差分别为铜:5.6%、铅:3.6%、镉:5.3%、镍:5.8%。 相似文献
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采用火焰原子吸收分光光度法测定了复方丹参片中钠、钙、镁、钾、铁、铬、锰、镍、镉、铜、锌11种金属元素的含量。结果表明,复方丹参片中含有较丰富的金属元素,这为探讨复方丹参片中金属元素与治疗冠心病的关系提供了有用的数据。 相似文献
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This study reports the total and bioaccessible concentrations of heavy metals (Mn, Fe, Cu, Zn, Cd and Pb) in the seaweed Caulerpa racemosa var. corynephora collected from local markets along the Andaman coast of Krabi Province, Thailand. Microwave-assisted acid digestion (EPA Method 3052) was used for sample preparation prior to total metal analysis. The in vitro Unified Bioaccessibility Method (UBM) was applied to assess the bioaccessibility of the metals in the seaweed samples. The total, gastric phase, and residual fraction concentration were determined by inductively coupled plasma-optical emission spectrometry (ICP-OES). The total amounts found in the seaweed samples, in ascending order were Cd?in vitro bioaccessibility method. 相似文献
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本文研究了阳离子交换树脂D401对待测元素Cu,Zn,Pb,Cd,Ni的预浓集及洗脱性能,并与改进的流动注射(FI)相接合,建立了一套新型、高效的FI-阳离子交换-ICP-AES分析体系。从而极大地提高了分析的速度和灵敏度,分析速度可达每小时20个样品。Cu、Zn、Pb、Cd、Ni各元素的检测限分别为0.25ng/ml、0.17ng/ml、0.94ng/ml、0.75ng/ml和0.60ng/ml。利用此体系做水样加标试验获得较好回收率(96%~107%),实际分析标准物大米粉(GBW08502)结果与标准值接近。 相似文献
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本文建立了激光烧蚀进样与ICP-MS联用超快速分析玩具中铝、锑、砷、钡、硼、镉、铬、钴、铜、铅、锰、汞、镍、硒、锶、锌等16种有毒有害元素的分析方法。通过自制校正标样和仪器条件实验,优化了激光与ICP-MS的仪器参数。不同元素方法定量下限在0.03~245mg/kg之间,检测精密度在4.2%~11.7%(n=7)之间,对EC680k和EC681k标准样品检测结果与标准值数据吻合,实际样品的检测结果与ICP-MS法检测结果一致,数据准确、可靠,满足分析测试的要求,同时完全满足欧盟新玩具指令对有毒有害元素检测的限量要求。 相似文献
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The aim of this study was to investigate the chemical properties of atmospheric particulate matter collected during post biomass burning events from November to December 2015. The types of particulate samples collected from the study area were total suspended particulates (TSP) and particulates less than 2.5?µm (PM2.5). Multiple methods were used for the qualitative and quantitative characterization. Fifteen major and minor trace metal analyses were performed using acid digestion followed by inductively coupled plasma mass spectrometry analysis. Infrared spectroscopy was used for the identification of functional groups of organic compounds present in the samples. In addition, field emission scanning electron microscopy–energy dispersive X-ray spectroscopy was used for morphological characterization and microanalysis of individual particles. The average measured concentration of trace metals in TSP and PM2.5 follows the order of Zn?>?Fe?>?Al?>?Cu?>?Pb?>?Mn?>?V?>?Cr?>?Ni?>?Sn?>?As?>?Hg?>?Cd?>?Ag?>?Co. Enrichment factor analysis showed strong anthropogenic contributions of Hg, Ag, Zn, Cd, Pb, As, Cu, and Sn in the samples. Field emission scanning electron microscopy–energy dispersive X-ray spectroscopy shows that three types of particles were present that originated from crustal and anthropogenic sources. Furthermore, the infrared measurements indicate that most compounds were organic acids and aromatic hydrocarbons. 相似文献