微波消解-ICP-AES/ICP-MS测定大米中微量元素

采用微波消解技术,电感耦合等离子体光谱(ICP-AES)和电感耦合等离子体质谱(ICP-MS)测定了分别产自辽宁、四川、湖南三地的大米中21种元素B、Ba、Ca、Cd、Cu、Fe、K、Mg、Mn、Na、P、S、Sr、Zn、Co、Ni、Cr、Mo、Pb、Li、Cs。所有元素标准曲线回归方程线形系数均大于0.999,各元素相对标准偏差(RSD)均小于5.31%(测定次数n=4),加标回收率为96.6%～110.6%,方法检出限:ICP-AES为0.0048～0.33μg·mL-1,ICP-MS为0.022～0.192ng·mL-1。用国家一级标准物质大米(GBW10010)验证了方法的准确性,测定值与推荐值相符,实验表明,P、S、K、Mg、Ca、Na、Zn、Mn、Fe、Cu在大米中含量较高。此方法简便、快速,适用于大米等粮食作物中微量元素的测定。     

微波消解-ICP-AES法测定茶叶中钾、钠、磷、硫、铁、锰、铜、锌、钙、镁方法研究

通过优化微波消解条件,并根据不同元素性质,调谐ICP-AES工作条件至最佳,实现了茶叶中K、Na、P、S以及Fe、Mn、Cu、Zn、Ca、Mg 10种元素的同时测定。10种元素测定结果 RSD%为0.67(Cu)～5.57(Na),回收率为84.0%(Na)～101.5%(Fe),检出限为0.001(Mn)～0.029(S)μg·g-1,表明该方法准确可靠,能够满足茶叶中K、Na、P、S、Fe、Mn、Cu、Zn、Ca、Mg分析要求。     

ICP-AES法同时测定芋头中的微量元素

采用电感耦合等离子体发射光谱法同时测定自塔芋头中Mg、P、K、Fe、Cu、Zn、Si、Co等8种微量元素的含量。该方法简单、快速、灵敏度高，准确性好。回收率在88．0％～114％之间之间，相对标准偏差小于2．9％。实验结果证明：芋头中含有丰富的对人体有益的K、P、Mg、Fe等元素。     

ICP-AES同时测定磷灰石中的K、Na、Ca、Mg、Ti等元素

研究了电感耦合等离子体原子发射光谱(ICP-AES)同时测定磷灰石中的K、Na、Ca、Mg、Ti等元素。确定了各元素的检出限,回收率在97%-104%之间,RSD小于1.5%,该方法用于样品测定,结果令人满意。     

ICP-OES和ICP-MS方法分析郫县豆瓣中矿物质元素的分布

通过优化微波消解郫县豆瓣样品预处理方法,建立电感耦合等离子体质谱法(ICP-MS)和电感耦合等离子体发射光谱法(ICP-OES)检测郫县豆瓣中14种矿物质元素(K、P、Al、Fe、Cu、Ca、Zn、Mn、Mg、Se、Pb、Cd、Cr、As)的定量分析方法,并对不同发酵时间的郫县豆瓣进行检测。得到Pb、Cd、Cr、As的检出限分别为:0.110μg/kg、0.014μg/kg、0.269μg/kg、0.132μg/kg,加标回收率介于91.1%～109.8%;K、P、Al、Fe、Cu、Ca、Zn、Mn、Mg、Se检出限介于0.0014～0.0328 mg/kg,加标回收率在91.9%～117.7%之间。对不同后发酵时长(1～11个月)郫县豆瓣中矿物质元素分布进行检测,结果显示在该时间范围内同一元素含量变化无显著性差异;Pb、Cd、Cr、As的残留量均远低于国标限量,显示郫县豆瓣在此方面的安全性。测试结果准确、高效,表明该方法具有良好的检测应用前景。     

ICP－OES法测定镀铬液中多种金属杂质元素

为简便而准确测定镀铬液中金属杂质元素的含量,采用电感耦合等离子体发射光谱法（ICP-OES）对镀铬液中A1,Mn,Fe,Co,Ni,Cu,Zn,Cd,Sb,Pb等杂质元素进行了测定,确定了仪器的最佳工作参数,选择了合适的分析谱线,研究了主量元素cr和共存元素对光谱的干扰情况。结果表明：10种金属元素的检出限为0．15～...     

应用ICP-MS测定葡萄酒中微量元素

应用电感耦合等离子质谱法（ICP-MS）葡萄酒中Mg、Ca、Fe、Mn等11种微量元素的含量。样品用1％硝酸稀释后直接测定。其结果方法的线性范围宽，线性相关系数均〉0．999。测定试样中11种元素的相对标准偏差（n=7）均低于6．O‰各元素的加标回收率均在80．5％～102％。结论：方法操作简便、快速、灵敏、准确，不同产地的葡萄酒中均含有较丰富的微量元素。     

扫描电镜和X射线能谱仪对真姬菇子实体常见微量元素的定性定量测定

利用扫描电镜和X射线能谱仪对真姬菇子实体菌盖、菌褶和菌柄中的常见的微量元素Na、Mg、S、P、K、Ca、Mn、Fe、Cu和Zn进行测定,并计算了它们的相对重量百分比。结果表明真姬菇子实体的菌盖、菌褶和菌柄的微量元素含量各不相同。     

XRF法测定福州大气颗粒物中部分金属元素含量

本文以美国Micromatter单元素标准膜为基础,结合NIST SRM 2783颗粒物滤膜标准样品,建立了波长色散-X射线荧光光谱法测定细大气颗粒物PM_(2.5)滤膜样品中K、Ca、Na、Mg、Pb、Zn、Ba、Cu、Fe、Mn等元素的方法。对比分析了空白特氟龙滤膜和空白石英滤膜,空白石英滤膜中Al、Ca、Cu、Fe、Ga、K、Mg、Mn、Na、Ni、Si、Zn元素的本底值比空白特氟龙滤膜的高,推荐选用特氟龙滤膜作为PM2.5组分分析采样滤膜。运用该方法测定福州PM2.5样品中的金属元素,考察在不同PM_(2.5)浓度下使用XRF法与ICP-MS法测量特氟龙滤膜得出的两种实验结果的可比性及相关性,结果表明两种方法测得的平均值和相关性都较好,相关系数范围0.8340～0.9881,显示本方法可靠,能够满足目前的监测需求和广泛使用。     

长春市2006—2007年采暖期大气降尘来源研究

研究长春市2006—2007年采暖期大气降尘的来源,采用电感耦合等离子体法分析降尘中的元素组成,应用富集因子法分析大气降尘中各元素的来源,应用化学质量平衡法分析各污染源的特征元素。结果表明:大气降尘样品中主要元素有As、Mn、Ca、Mg、Fe、Ti、Al、Pb、Zn和Cu;采暖期间长春市区的大气降尘首要来源是燃煤尘,其次是土壤风沙尘;降尘中各污染源特征元素是,建筑尘为Ca元素,土壤风沙尘为Al元素,机动车尾气尘为Pb、Zn元素,燃煤尘为Ti、Mn元素,道路尘为Fe元素;富集因子法和化学质量平衡法在元素的来源分析上具有很好的一致性。     

光亮镀镍液中杂质元素的电感耦合等离子体质谱法测定

电感耦合等离子体质谱(ICP-MS)易于进行多元素分析,检出限低,应用广泛.适当选择待测元素的同位素来克服质谱干扰,以Sc,Y,Bi作为内标元素来补偿基体效应,用ICP-MS法测定了光亮镀镍液中Mg,Al,Cr,Mn,Fe,Cu,Zn,Pb 8种杂质元素.结果表明:8种微量金属元素的检出限在0.008～0.340 μg...     

原子吸收光谱法测定武夷岩茶中金属元素的含量

本文采用原子吸收光谱法对武夷山岩茶中影响岩茶品质的铜、铁、锰、镁、钙、锌6种元素的含量进行测定。测定结果表明:武夷岩茶中含有丰富的人体必需的微量元素,其中钙、镁、锰、铁的含量与绿茶比较有明显的优势。     

Trace elements partitioning during co-firing biomass with lignite in a pilot-scale fluidized bed combustor

This study describes the partitioning of 18 trace elements (As, Ba, Cd, Co, Cr, Cu, Li, Mn, Mo, Ni, P, Pb, Sb, Se, Sn, Tl, V, Zn) and 9 major and minor elements (Al, Ca, Fe, K, Mg, Na, S, Si, Ti) during co-firing of olive residue, hazelnut shell and cotton residue with high sulfur and ash content lignite in 0.3 MW(t) Middle East Technical University (METU) Atmospheric Bubbling Fluidized Bed Combustor (ABFBC) test rig with limestone addition. Concentrations of trace elements in coal, biomass, limestone, bottom ash, cyclone ash and filter ash were determined by inductively coupled plasma optical emission and mass spectroscopy (ICP-OES and ICP-MS). Partitioning of major and minor elements are influenced by the ash split between the bottom ash and fly ash and that the major proportion of most of the trace elements (As, Ba, Co, Cr, Cu, Li, Mn, Mo, Ni, Pb, Tl, V and Zn) are recovered in fly ash when firing lignite only. Co-firing lignite with biomass enhances partitioning of these elements to fly ash. Co-firing also shifts the partitioning of Cd, P, Sb and Sn from bottom to fly ash.     

Determination of various constituent elements of polyethylene terephthalate bottles used for beverages in Japan

Polyethylene terephthalate (PET) bottles are some of the most commonly used containers for beverages. During the manufacturing process of PET resin in Japan, metallic catalysts such as Sb and Ge are widely used, with other metals or metallic compounds also being employed to improve the quality of PET bottles. However, few reports into the contents of such elements exist. Thus, we herein report the concentrations of 34 elements (ie, Li, B, Na, Mg, Al, P, K, Ca, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, As, Se, Rb, Sr, Zr, Mo, Ag, Cd, Sn, Sb, Cs, Ba, W, Pb, and U) in 16 samples of unused virgin PET bottles for beverages. The measurement was performed by inductively coupled plasma optical emission spectrometry (ICP-OES) and inductively coupled plasma mass spectrometry (ICP-MS), and these bottles were found to contain five main elements (ie, <0.5- to 50-mg/kg Ge, <1- to 26-mg/kg Ti, <0.1- to 279-mg/kg Sb, <10- to 48-mg/kg P, and <0.5- to 53-mg/kg Co) that were used as polymerisation catalysts, stabilisers, oxidation catalysts, and bluing agents. Furthermore, when these residual element concentrations in 21 commercial mineral-water PET bottles were determined, there was no significant difference from unused bottles.     

Assessment of trace element levels in Rhododendron honeys of Black Sea Region, Turkey

Rhododendron and multi-flower honeys obtained from Black Sea Region of Turkey (12 Rhododendron and 8 multi-flower honeys) were studied to determine the presence of the 14 trace elements such as Cu, Cd, Pb, Co, Cr, Ni, Al, Se, Zn, Mn, Fe, K, Ca and Mg. Trace element determination was performed by atomic absorption spectrometry (AAS) after microwave digestion. The results revealed that Rhododendron honeys exhibited higher concentrations of Cu, Co, Cr, Ni, Se, Zn, Ca and Mg but lower concentrations of Al, Mn, Fe and K than in the multi-flower honeys. Trace element levels in analyzed honey samples were generally lower than literature values.     

海芒果树叶中氨基酸和微量元素的分析

采用高效液相色谱法和等离子发射光谱法,分析测定了红树植物海芒果Cerberamanghas树叶中氨基酸和微量元素成分。结果表明,叶子提取液中含有16种氨基酸,其中6种为必需氨基酸,2种为半必需氨基酸,其中必需氨基酸占总氨基酸的33.20%;15种微量元素,分别为Al、As、Ba、Ca、Cd、Cr、Cu、Fe、Mg、Mn、Ni、Pb、Sr、Ti、Zn。     

Relevance for food sciences of quantitative spatially resolved element profile investigations in wheat (Triticum aestivum) grain

Bulk element concentrations of whole grain and element spatial distributions at the tissue level were investigated in wheat (Triticum aestivum) grain grown in Zn-enriched soil. Inductively coupled plasma mass spectrometry and inductively coupled plasma optical emission spectrometry were used for bulk analysis, whereas micro-proton-induced X-ray emission was used to resolve the two-dimensional localization of the elements. Soil Zn application did not significantly affect the grain yield, but did significantly increase the grain Ca, Fe and Zn concentrations, and decrease the grain Na, P and Mo concentrations; bulk Mg, S, K, Mn, Cu, Cd and Pb concentrations remained unchanged. These changes observed in bulk element concentrations are the reflection of tissue-specific variations within the grain, revealing that Zn application to soil can lead to considerable alterations in the element distributions within the grain, which might ultimately influence the quality of the milling fractions. Spatially resolved investigations into the partitioning of the element concentrations identified the tissues with the highest element concentrations, which is of utmost importance for accurate prediction of element losses during the grain milling and polishing processes.