微波消解-原子吸收法测定花生中钙、镁、铜和锌的含量

利用微波消解仪将花生消解,用原子吸收法测定去壳花生中钙、镁、铜和锌的含量。研究了微波消解条件对测定结果的影响。结果表明:用30%过氧化氢和浓硝酸作为消化液,工作曲线的相关系数在0.999 10.999 3之间,4种微量元素的加标回收率在96.51%100.49%之间,检出限在0.125 10.750 1μg/m L之间;菏泽去壳花生中钙、锌、镁、铜都有相对较高的含量。该方法具有方便快捷、准确可靠等优点,是花生中4种元素测定的理想方法。     

大蒜中Mg,Zn,Fe,Ca元素的形态分析

文章建立了微波消解,超声波提取,原子吸收光谱法测定大蒜中Mg,Zn,Fe,Ca元素形态分析的方法.用0.45 μm滤膜,D101型大孔吸附树脂,将大蒜液中4种微量元素分为悬浮态、可溶态、有机态和无机态.对微波消解、原子光谱工作条件进行了优化,在选定的最佳测定条件下,分别对大蒜中样品中4种微量元素的总量及其形态进行测定,结果显示:大蒜中Mg,Zn,Fe的无机态含量＞有机态＞可溶态＞悬浮态.Ca元素则是无机态含量＞有机态＞悬浮态＞可溶态.各元素的精密度在1％～6.9％之间,以Zn做加标回收验证测定的准确度,回收率在88.7％ ～104.2％之间,结果较为满意.该方法简单、快速,为研究大蒜中微量元素及其功效提供参考.     

Determination of essential and non-essential elements in various tea leaves and tea infusions consumed in Turkey

Tea is one of the most popular beverages in the world. Thus, the chemical components in tea are of great interest, especially in relation to health. In this study, 12 tea samples (10 black, 1 white and 1 green) and 5 herbal tea samples were purchased from supermarkets in Izmir, Turkey. Sample preparation has been performed using wet and microwave digestion procedures. The elemental content (Fe, Zn, Cu, Mn, Ni, Na and K) in the digests and infusions has been analysed. Generally, elemental contents in tea leaves were found to be higher than those in tea infusions. The accuracy of the method was checked and confirmed by standard reference material analyses. The comparison of wet and microwave digestion has not shown significantly different results. Therefore, the microwave digestion procedure was preferred because it is less laborious. The elemental intake related to tea consumption has also been studied.     

Trace element levels in honeys from different regions of Turkey

A survey of 25 honey samples from different botanical origin, collected all over the Turkey was conducted to assess their trace element contents. The aim of this study was to determine the levels of cadmium (Cd), lead (Pb), iron (Fe), manganese (Mn), copper (Cu), nickel (Ni), chromium (Cr), zinc (Zn), aluminium (Al) and selenium (Se) in honey samples from different regions of Turkey. Trace element contents were determined by a flame and graphite furnace atomic absorption spectrometry technique after dry-ashing, microwave digestion and wet-digestion. The accuracy of the method was corrected by the standard reference material, NIST-SRM 1515 Apple leaves. The contents of trace elements in honey samples were in the range of 0.23–2.41 μg g⁻¹, 0.32–4.56 μg g⁻¹, 1.1–12.7 μg g⁻¹, 1.8–10.2 μg g⁻¹, 8.4–105.8 μg kg⁻¹, 2.6–29.9 μg kg⁻¹, 2.4–37.9 μg kg⁻¹, 0.9–17.9 μg kg⁻¹, 83–325 μg kg⁻¹ and 38–113 μg kg⁻¹ for Cu, Mn, Zn, Fe, Pb, Ni, Cr, Cd, Al and Se, respectively. Iron was the most abundant element while cadmium was the lowest element in the Turkish honeys surveyed. The results showed that trace element concentrations in the honeys from different regions were generally correlated with the degree of trace element contamination of the environment.     

微波消解-原子吸收光谱法测定玉米油中的矿物质含量

采用HNO_3-50%H_2O_2微波消解体系,空气-乙炔火焰原子吸收光谱法,分析不同来源、不同品牌玉米油中Ca、K、Mg、Fe、Na、Zn 6种矿物质元素含量。结果表明:该方法能准确测定玉米油中矿物质元素含量,线性方程相关系数均在0.995以上,相对标准偏差在1.8%~4.3%,方法精密度高,回收率为89.30%~115.80%,回收结果满意,且方法简单。同时发现大型超市购买的玉米油中矿物质含量稳定,且含量顺序均为CaKMgFeNaZn,农贸市场购买的玉米油矿物质含量差异较大,存在个别元素过高或过低现象。     

微波消解-原子吸收光谱法测定昭平绿茶中微量元素

茶叶中微量元素的含量分析是茶叶科学的重要研究内容之一,其含量高低对茶叶品质影响较大,因此,有必要对茶叶中的微量元素进行测定。研究建立了以HNO3-H2O2为消解液进行微波辅助消解样品,火焰原子吸收光谱法测定绿茶中铜、铁、锌微量元素含量的方法。实验采用程序升温的方式进行样品消解,回收率高,并且对三种绿茶样品测定结果进行了比较分析。回收率在93.6%101.5%之间,RSD在0.58%3.16%之间;样品中微量元素含量分别为Fe:98.95 177.8μg/g,Zn:45.67 59.29μg/g,Cu:19.7724.22μg/g。此方法测定茶叶中微量元素,可靠、灵敏度高,选择性好,方法简便,且对环境友好,适合常规分析。     

7种单花蜂蜜中矿物元素的测定及蜜种特征研究

目的 采用电感耦合等离子体质谱法(inductively coupled plasma mass spectrometry, ICP-MS)同时测定蜂蜜中 K、Ca、Na、Mg、Fe、Sr、Mn和 Cu共 8种矿物元素的含量, 并将其用于蜂蜜的特征分析和产地溯源.方法 选取中国不同地理位置的 7种特色单花蜂蜜, 在硝酸...     

微波消解-原子吸收光谱法测定山西老陈醋中微量元素

以山西老陈醋为原料,微波消解法处理样品,采用原子吸收光谱法对Zn、Fe、K、Ca、Mg 5种微量元素含量进行测定。通过混酸体系、混酸体积比、样液与消解液体积比和消解时间单因素试验,利用正交试验确定微波消解处理样品的最佳条件。结果表明,在以HNO3-H2O2为消解试剂的混酸体系中,Zn、Fe、K、Ca四种微量元素最佳消解条件为混酸体积比7∶1,样液与消解液体积比1∶4,消解时间为20 min;微量元素Mg最佳消解条件为混酸体积比7∶1,样液与消解液体积比1∶4,消解时间为25 min,在此条件下,测得样品回收率在95.0%～106.0%,精密度试验结果相对标准偏差为0.42%～1.13%。优化后的微波消解法具有反应快、消解彻底、精密度好、准确度高等特点,为进一步研究和分析山西老陈醋的营养价值提供参考。     

微波消解-电感耦合等离子体发射光谱(ICP-OES)测定茶叶中多种微量元素

采用微波消解和ICP-OES对茶叶中10种微量元素进行了分析测定.拟定了测定方法,加标回收率在95.4％～102.4％之间,相对标准偏差(n=6)在0.75％～3.89％之间,满足分析要求.为茶叶中微量元素的检测分析提供了快速准确的测定方法.     

电感耦合等离子体质谱法测定话梅中11种微量元素

目的建立电感耦合等离子体质谱法(inductively coupled plasma mass spectrometry,ICP-MS)测定话梅中V、Cr、Co、Ni、Cu、Zn、As、Sr、Cd、Ba和Pb共11种微量元素的分析方法。方法样品经微波消解,用ICP-MS同时测定11种元素的含量,测定值采用SPSS 16.0进行Pearson相关性分析。结果 11种元素在0~500μg/L范围内线性关系良好,相关系数均大于0.9997,检出限为0.002~0.01 mg/kg,加标回收率为84.5%~110.3%,相对标准偏差小于5%。国家标准物质胡萝卜(GBW10047)测定结果基本在标准认定值范围内。所测样品中元素平均含量从高到低排序为:SrZnCuBaNiCrPbVAsCoCd。相关性分析显示所测元素中部分元素间有一定的相关性。结论该法简单、快捷、可靠,适合于话梅中微量元素的测定,测定结果可为话梅的质量控制提供技术依据。     

大西洋鲑肌肉中9种矿物质元素含量的测定及营养评价

采用微波消解-火焰原子吸收法测定大西洋鲑肌肉中9种矿物质元素的含量,建立微波三阶段梯度升温消解技术,确定最佳消解条件和原子吸收分光光度计工作条件。大西洋鲑肌肉中Ca、Fe、Mn、Zn、Mg、Cu、Cr、Cd、Pb的含量分别为292.6,1.8,1.6,2.9,149.2,0.005 3,0.004 4,0.003 7,0.011 5μg/g。结果表明:大西洋鲑肌肉中含有多种对人体有重要生理功能的矿物质和微量元素,比例恰当,具有较高的营养价值。其中Cd、Pb、Cr、Cu等重金属含量均远远低于在中国国标产品安全卫生指标,可以安全食用。     

Toxic and essential elements in butter from the Black Sea region,Turkey

In this study, 88 randomly selected samples of butter produced in the Black Sea region of Turkey were purchased from different retail markets during different periods and investigated for toxic and essential elements content. Quantitative analyses of elements in the samples were performed using an inductively coupled plasma-mass spectroscopy (ICP-MS). Mean concentrations of As, Cr, Cu, Fe, Mn, Ni, Pb, Se and Zn in the butter samples were 18.93, 100.32, 384.66, 4199.1, 887.47, 168.64, 56.13, 16.34 and 384.66 µg kg^?1, respectively. Cd and Co were detected in 19 (mean content 0.29 µg kg^?1) and 81 (mean content 3.81 µg kg^?1) samples of 88 butter samples, respectively. However, the dietary intake of these elements by the population of the Black Sea region is currently well below the dietary reference intake (DRI) and provisional tolerable weekly intake (PTWI) levels of essential and toxic elements.     

原子吸收法测定海带微量元素的含量

用灰化法溶解试样,配制混合标准系列溶液,采用空气-乙炔火焰原子吸收法测定海带中11种微量元素含量。建立了优化的仪器测试条件,方法简便、准确。结果表明,干海带中含Ca、Mg、K为1.65～62.31mg/g;Sr为185.9μg/g;Fe为529.3μg/g;Ni、Cu、Mn、Zn为16.28～52.48μg/g;Cd为0.93μg/g;Pb为1.35μg/g,结果满意。     

Determination of heavy metals in different honey brands from Iranian markets

A variety of elements are present in honey at different concentrations. Although some of these heavy metals and trace elements are useful nutrition, at higher levels they could cause health problems. In order to achieve confidence about food safety, regular monitoring of food quality is necessary. In this study, heavy metals and trace element contents were determined by inductively coupled plasma atomic emission spectrometer in 10 different honey brands from Iranian markets. All heavy metal contents in these samples were within ranges as reported in literature, except for Hg, Al and As. Compared with recommended daily intakes, it is concluded that heavy metals or trace elements intoxication following honey consumption in Iran is unlikely.     

Evaluation of toxic elements in baby foods commercially available in Pakistan

In present work, the concentrations of toxic elements, aluminium (Al), cadmium (Cd), nickel (Ni) and lead (Pb) were measured in different solid baby foods (BFs), primarily to evaluate whether the intakes comply within permissible levels of these toxic elements (TEs). The BFs were evaluated for total contents of TEs, using a simple and fast ultrasound-assisted extraction (UAE) method. The accuracy of the proposed UAE method was ensured by using certified reference materials and results obtained by conventional wet acid digestion method on same CRM, at 95% confidence level. The range of the investigated TEs in different BFs were 4770–35,200, 25.6–88.3, 124–332 and 52.5–90.6 μg/kg for Al, Cd, Ni and Pb, respectively. The results indicated that BFs including rice cereals have high level of all four TEs. The daily intakes of TEs for children through BFs have also been estimated, and are well below the recommended tolerable levels.     

浊点萃取-火焰原子吸收法(CPE-FAAS)测定蜂蜜中痕量锰

研究了以8-羟基喹啉为络合剂,非离子表面活性剂TritonX-100为萃取剂的浊点萃取-火焰原子吸收光谱法(CPE-FAAS)测定蜂蜜中痕量Mn(Ⅱ)的方法。研究了pH值,平衡时间,离子强度,萃取剂用量,以及络合剂用量和共存离子干扰等对萃取效果的影响。方法线性范围为100～700 ng/mL,检出限为5.74 ng/mL,相对标准偏差为1.68%(n=11),回收率为97.3%～98.6%。     

微波消解-ICP-MS测定富硒大米中5种微量元素和5种重金属元素

建立电感耦合等离子体质谱法(ICP-MS)同时测定富硒大米中5种微量元素和5种重金属元素的方法 ,研究市售富硒大米中10种元素的含量。分别对硝酸用量、过氧化氢用量、微波消解程序进行优化,得出优化前处理方法,并用质控样品进行验证。结果表明:优化的前处理条件为:7 mL硝酸,20℃升温5 min、恒温5 min,160℃升温5 min、恒温5 min,180℃升温5 min、恒温15min。该方法简单快速、试剂用量少,准确性好,适用于富硒大米中多元素的同时测定;用该方法测定市场上随机购买的富硒大米,硒元素含量参差不齐,与其他4种微量元素(Zn、Fe、Co、Mo)没有明显的正相关或负相关关系,5种重金属(Pb、As、Hg、Cd、Cr)均在限量范围内。     

微波消解-原子吸收法测定酥油粉中微量元素

本研究以消化温度、消化时间和消化压力为三个考察因素设计正交试验,对实验室自制微胶囊酥油粉进行微波消化。用火焰原子吸收光谱法对样品中的Ca、Mg、Fe、Cu、Zn五种元素进行测定。结果表明,最佳消化条件为:消化温度200℃,消化时间5min,消化压力15atm。在最佳实验条件下,对酥油粉各元素的含量做了回收实验,回收率范围在94.1%～105.1%,相对标准偏差0.41%～3.78%(n=6)。     

微波消解-电感耦合等离子体质谱法同时测定椴树蜂蜜中23种元素

椴树蜂蜜是我国东北地区特色蜜种,为了解椴树蜂蜜中元素含量分布,本文建立了微波消解-电感耦合等离子体质谱（ICP-MS）同时测定椴树蜂蜜中B,Na,Mg,P,K,Ca,V,Cr,Mn,Fe,Co,Ni,Cu,Zn,Ga,As,Rb,Sr,Mo,Cd,Ba,Pb和U等23种元素的分析方法。结果表明,该方法加标回收率（n=6）在86.5%¹09.8%之间,选择国家标准物质菠菜（GBW10015）和茶叶（GBW10016）验证方法的可靠性,待测元素测定值基本在标准值允许范围内,日内相对标准偏差（n=3）在0.3%⁸.7%之间,日间相对标准偏差（n=5）在1.2%¹0.4%之间。应用该方法测定了吉林省不同采样点的10个椴树蜂蜜,结果发现K的含量最高,As,Cd和Pb含量均符合蜂蜜中相关限量标准要求。根据测定结果,建立了吉林省椴树蜂蜜中元素指纹图谱,发现不同产地的10个椴树蜂蜜样品中元素分布具有共同特征,可为椴树蜂蜜蜜种鉴别提供判别依据。