共查询到18条相似文献,搜索用时 62 毫秒
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微波消解-火焰原子吸收光谱法测定皮革中镉含量 总被引:2,自引:0,他引:2
用微波消解皮革试样,火焰原子吸收法测定镉含量.通过试验,优化了微波消解条件.样品分析结果表明相对标准偏差为4.9%;加标回收率为88.5%~102.2%. 相似文献
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火焰原子吸收法测定奶粉中痕量铅镉的含量 总被引:4,自引:0,他引:4
采用标准加入法,用APDC-DDTC-MIBK-环己烷体系萃取处理后奶粉中痕量铅镉,并利用空气-乙炔火焰原子吸收法测定其含量。建立了优化的萃取和测定条件,并对可能存在的干扰元素进行了干扰实验。本法测铅的相对标准偏差在1.8%~2.5%,回收率为98%~102%。测镉的相对标准偏差为1.6%~1.9%,回收率为99%~101%,结果十分满意 相似文献
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采用微波消解-氢化物原子吸收光谱法测定皮革制品中重金属铅的含量。优化了微波消解条件,并对硼氢化钠浓度、溶液酸度、铁氰化钾以及共存离子的干扰等条件进行了研究和选择。方法的检出限为0.036μg/L,应用此法对皮革制品进行分析,回收率在96.8%~105.6%之间。该方法具有快速、准确、干扰少等优点。 相似文献
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白酒中的乙醇对FAAS法测定铅有干扰,本文试验了除去乙醇后定容至原体积、FAAS法直接测定铅,并与硝酸—高氯酸消化后定容至原体积,FAAS法测定的方法比较了两种处理方法结果一致。前者方法更灵敏,RSD≤10%,加标加收率为93.8%-102.2%,试验条件下铅的特征浓度为0.25mL^-1,由于不稀释样品,相当于降低了测定下限,完全适合国家卫生标准的要求。 相似文献
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文章介绍了一种微波消解-石墨炉原子吸收光谱法测定木姜子中铅和镉含量的方法.试样用HNO3-H2O2消解,标准曲线法进行测定.结果表明:该方法线性关系和重复性较好,对于铅、镉的相关系数均>0.996,检出限分别为89.8 pg和4.44 pg,相对标准偏差为3.5%~5.0%,加标回收率为97.1%~110.9%,该法能用于木姜子中铅和镉元素的测定. 相似文献
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采用微波消解技术和石墨炉原子吸收光谱法测定市售散装和包装干制品中铅、镉的含量,并根据国标进行分析。检测结果表明,样品中重金属超标现象严重,同时散装干制品不合格率高于包装干制品,因此包装干制品较散装干制品相对安全一些。 相似文献
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《Food additives & contaminants. Part A, Chemistry, analysis, control, exposure & risk assessment》2013,30(11):1987-1992
Migration studies of trace metals were carried out on coated chickpea cans marketed in Lebanon. Four elements – iron (Fe), tin (Sn), lead (Pb) and cadmium (Cd) – were analysed by atomic absorption spectrometry (AAS) after microwave digestion. Over 3 months, three different storage temperatures (5°C, room temperature and 40°C) were tested. In all cases, the migration of Fe reached a plateau after around 50 days of storage, while the migration of Pb was slow till 50 days, then it increased rapidly. Cd and Sn levels did not increase. Moreover, no effect of temperature was observed in the case of Fe, whereas Pb levels showed slower migration in cans stored at 5°C. Comparing cans from different chickpea brands (Lebanese and foreign) showed that the characteristics of the container have an effect on metal release. 相似文献
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Mostafa Hossein Baki Farzaneh Shemirani Rouhollah Khani 《Journal of food science》2013,78(5):T797-T804
Application of treated sawdust with NaOH as a green and economical sorbent for simultaneous preconcentration of trace amounts of Cd(II), Co(II), and Pb(II) ions from liver, lettuce, fish, and water as test samples with complicated matrices was investigated. Various parameters, such as effect of pH and contact time, breakthrough volume, type, and concentration of eluent and interference of ions were studied. The sorption was quantitative in the pH of 5.0 to 7.0 and desorption occurred instantaneously with 5.0 mL of mixed solutions of ethanol and 2.0 mol/L HNO3–HCl and the amount of ions was measured by using flame atomic absorption spectrometry. Linearity was maintained at 3 to 500 μg/L for cobalt, 5.0 to 800 μg/L for lead, and 2.0 to 300 μg/L for cadmium in the original solution. The relative standard deviation was less than 1.80% (n = 6, with concentration of 0.3 mg/L for cadmium and 0.5 mg/L for lead and cobalt). Detection limits and maximum capacity of the sorbent for Co (II), Cd (II), and Pb (II) in the original solution were 0.86, 0.50, and 1.7 μg/L and 28.5, 30.6, and 47.3 mg/g, respectively. The results for spiked real samples, effect of interfering ions, and adsorption capacity indicated that the applicability of this method for lead preconcentration is better than cadmium and cobalt preconcentration from complicated matrices. Practical Application : Sawdust can be applied as a green and economical sorbent for simultaneous preconcentration and solid‐phase extraction of metal ions from food and environmental samples with complicated matrices. 相似文献
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食用油中痕量镉含量的测定 总被引:1,自引:0,他引:1
将食用油灰化处理后,用APDC-DDTC-MIBK体系萃取富集试液中的镉,利用空气-乙炔火焰原子吸收法测定其含量.建立了优化的测定条件,并对可能存在的元素作了干扰实验.结果表明,测定镉的相对标准偏差为1.8%~3.1%,回收率为97.1%~101.5%,结果十分满意. 相似文献