微波消解-电感耦合等离子体质谱(ICP-MS)法测定拟黑多刺蚁中11种微量元素

为准确定量拟黑多刺蚁体内的微量元素,采用微波消解法,以HNO_(3)-H_(2)O_(2)混合酸为消解体系对样品进行前处理,选择合适的同位素,以^(103)Rh为内标测定^(52)Cr、^(55)Mn、^(60)Ni、^(63)Cu、^(66)Zn、^(75)As、^(78)Se、^(88)Sr和^(114)Cd,以^(185)Re为内标测定^(202)Hg和^(208)Pb,建立了电感耦合等离子体质谱法测定拟黑多刺蚁中11种微量元素的方法。实验发现,以HNO_(3)-H_(2)O_(2)为消解体系,样品消解完全;采用KED模式消除质谱干扰,以内标法校正基体效应;通过绘制校准曲线及测定流程空白,各元素校准曲线的相关系数均大于0.999,方法检出限为0.0005~0.011 mg/kg,方法定量限为0.0016~0.033 mg/kg。对拟黑多刺蚁实际样品进行测定,各元素的相对标准偏差(RSD,n=9)在1.2%~5.5%,加标回收率为91.2%~107%;经过实验室间比对实验,相对偏差为-3.15%~2.74%;测定六个不同产地的拟黑多刺蚁样品,结果显示不同产地样品除Cd外,其他10种微量元素的含量均存在较大差异。测定结果稳定可靠,能满足拟黑多刺蚁中11种微量金属元素含量的分析检测要求。     

电感耦合等离子体质谱法(ICP-MS)测定古造液酒中微量元素含量及功能评价

目的测定古造液酒中微量元素含量,并与饮用白酒、国囍酒比较,看其微量元素含量高低情况。方法采用电感耦合等离子体质谱法(ICP-MS)测定微量元素含量。检测限为0.30~3.43μg·L~(-1),回收率范围在95.4%~104.3%,相对标准偏差(RSD)范围在1.1%~2.0%。结果测定方法准确可靠。古造液酒中的微量元素明显高于饮用白酒和国囍酒。结论古造液酒富含微量元素,具有较高的临床价值。     

原子吸收法对藏草药水母雪兔子和多刺绿绒蒿中12种元素的初步形态分析

用原子吸收光谱法,对产于青藏高原的藏草药水母雪兔子和多刺绿绒蒿,测定了全药材、水提液、醇提液中12种元素(Cr、Cu、Fe、Mn、Ni、Se、Zn、K、Ca、Mg、Cd、Pb)的含量,以及水提液中各元素可溶态、水溶态的含量,同时采取正辛醇-水分配体系模拟藏药水提液中各微量元素在人体胃肠中的分配情况,对藏药中微量元素的初级形态进行了分析,初步探讨了酸度变化(人体胃肠酸度)对微量元素的影响,结合藏药药效讨论其相关性,为进一步研究微量元素与藏药药性、药效的关系提供科学依据.     

浙江不同地区银杏叶中微量元素的研究

用荧光分光光度法和能量色散X荧光分析法测定了浙江不同地区银杏叶中某些微量元素含量的变化。结果表明:不同地区的银杏叶中微量元素硒、铜、锌、铬、铁和锰的含量范围分别为0.1～2.17×10~(-6),2.8～6.9×10~(-6),6.1～17.1×10~(-6),1.1～6.6×10~(-6),74～399×10~(-6)和15～73×10~(-5).     

不同月份栽培藏木香微量元素的含量测定及动态分析

采用火焰原子吸收光谱法对不同月份栽培藏木香中Cu、Zn、Fe、Mn、Ca、K、Mg和Na8种微量元素进行了分析测定。结果表明,在选定的测定条件下,栽培藏木香中各元素间相互干扰小,对测定无明显影响。方法的标准曲线线性关系良好(r=0.997 3~0.999 9),方法回收率(n=7)在97.5%~100.3%之间,RSD值(n=7)在1.16%~2.76%之间。栽培藏木香中K、Ca、Mg含量较高且不同月份微量元素含量有所不同,其中Zn、Cu、Mn含量基本稳定;K、Na、Ca、Mg、Fe等元素含量呈现较大幅度的变化趋势。研究结果为合理利用藏木香资源提供了可靠依据。     

南方紫花苜蓿植株中微量元素含量分析

采用原子吸收分光光度法对12个苜蓿品种植株的地上部分Fe、Zn和Mn等3种微量元素含量进行了测定分析。结果表明,紫花苜蓿地上部全株中人体所需Fe、Mn和Zn等微量元素含量丰富,Fe质量分数为211.35~300.19μg/g;Zn质量分数为42.80~57.65μg/g;Mn质量分数为55.31~91.19μg/g。并且,不同品种植株中微量元素含量由高到低顺序均为Fe、Mn、Zn。     

海水中微量元素的分析

海水中除含有钠、镁、钙、钾、锶、硼、氯化物、硫酸盐、溴化物、碳酸盐及氟化物等十一种含量在1 ppm 以上的常量元素外,还含有数十种含量在1 ppm 以下的微量元素。这些微量元素的含量常随空间、时间而有所差异,它们的含量常以 ppb(10~(-9))计算,有些元素的含量甚至低至 ppt(10~(-12))量级。由于海水中微量元素的含量低,某些分析方法的灵敏度受到了限制,不适于这些元素的测定。而可用以测定海水中微量元素的分析方法有:中子活化法,放射化学分析法,原子吸收分光光度法,分光光度法,火焰光度法,萤光分析法,X 射线萤光     

猪、兔、羊、鸡肝脏中必需微量元素和脂肪酸含量的比较研究

以猪、兔、羊、鸡的肝脏为材料,利用高频电感耦合等离子体原子发射光谱仪(ICP-AES)测定了其微量元素Zn、Fe、Cu、Mn的含量,新极谱仪测定了Se的含量,气相色谱仪测定了必需脂肪酸亚油酸(C反18：2)和γ-亚麻酸(Cγ-18：3)的含量。结果表明,Fe在所测五种微量元素中含量最高,Zn其次,Se最低。四种动物肝脏中,兔肝的Zn、Fe、Se含量(鲜重)最高．分别为34．00μg/g,151．70μg/g和0.14μg/g;羊肝的Cu含量(鲜重)最高,为65．72μg/g;鸡肝的Mn含量(鲜重)最高,为1．94μg/g。此外,在所测定的两种必需脂肪酸中,兔肝的亚油酸含量(鲜重)最高,为24．08％;鸡肝中γ-亚麻酸含量最高,为1．08％。结果提示,在选用动物肝脏作为营养素源和制备保健品时,应考虑微量元素和必需脂肪酸的含量特点,有效利用其营养价值。     

X射线荧光光谱法同时测定铬铁中铬、硅、锰和磷的含量

<正>铬铁是一种常见的合金原料,按照碳含量的不同分为微碳、低碳、中碳、高碳铬铁。目前,国内测定铬铁中的铬元素采用国家标准方法~([1]),微量元素可以按照国家标准方法一一测定,但是耗时过长,效率极低。电感耦合等离子体原子发射光谱法(ICPAES)可高效快速地测定微量元素~([2-5]),也有用ICP-     

ICP-OES测定熊肉中7种微量元素的含量

采用等离子体发射光谱法(ICP-AES)测定棕熊肉中的微量元素。熊肉中含有Cu,Al,Zn,Fe,Cr,Ti,Tl等7种微量元素。该方法对各元素的检出限为0.0004~0.006 mg/L,各元素相对标准偏差在1.12%~6.19%,加标回收率96%~102%。7种微量元素中Al、Fe、Zn的含量较高。     

野生中草药木贼中微量元素的测定

目的测定中草药木贼中微量元素的含量。方法用湿法消化及于法灰化两种方法处理样品并进行了比较,用火焰原子吸收法测定了中草药木贼中7种微量元素的含量。结果测定结果湿法的RSD在0．5％～3．0％,干法的RSD在0．5％-7．5％之间。结论湿法处理金属离子损失小,测量精密度更好。木贼中微量元素的含量由高到低顺序为：Mg,Fe,Mn,Zn,Cu,Ph,Ni。     

Inductively Coupled Plasma(ICP) Mass Spectrometry(MS) Hyphenated with Atomic Emission Spectrometry(AES) for Simultaneous Determination of Major, Minor and Micro Amounts of Elements in Geochemical Samples

Introduction Geological resource survey demands for determining various constituents including major, minor, micro, trace and ultra-trace levels of elements for preparing the map of resource distribution of our country. As a powerful and popularly used technique for multi-element analysis, inductively coupled plasma(ICP) atomic emission spectrometry (AES) has been applied to this field for a period of time[1-3]. However, ICP spectrometric determination of those micro, trace and ultratrace elements needs enrichment procedures for improving the detection limit, which is unacceptable in case a great mass of samples should be analyzed as that in the task of geological resource survey. On the other hand, although ICP mass spectrometry(MS) is considered the most powerful method for trace elements determination[4,5], it is difficult for ICP-MS to be used to determine the trace and major analytes simultaneously in a spectrum.     

封闭压力酸溶-盐酸提取-电感耦合等离子体原子发射光谱法(ICP-AES)测定页岩中的多种微量金属元素

采用高温、高压消解罐法前处理页岩矿石样品,电感耦合等离子体原子发射光谱法(ICP-AES)测定了页岩标准物质中的多种微量元素的含量。实验过程中确定了最佳工作条件,选择了最佳分析谱线。实验结果表明,该方法线性相关系数良好r0.999 8,方法检出限低,精密度高,RSD小于3.0%,可同时测定页岩矿石中的多种金属元素,方法完全能满足岩石、土壤、沉积物中多种元素的检测需求。     

端视电感耦合等离子体原子发射光谱法测定人参不同部位中的微量元素

人参是一种多年生草本植物,其药效主要归功于人参皂甙和微量元素。本文利用微波消解处理人参根、须及果实样品,并采用端视电感耦合等离子体原子发射光谱法测定了绝大部分微量元素的含量。结果发现,人参不同部位中钾、钙、镁、磷等元素的含量均较高;参须中微量元素的含量普遍要比参根中高;除个别微量元素外,人参果里微量元素的含量大多介于参须和参根之间。     

Determination of trace elements in drinking tea by various analytical techniques

Tea has been one of the most popular simulating beverages which is both heavily produced and consumed in Taiwan. The determination of minor or trace elements in drinking tea and tea leaves is therefore important for estimating the daily intake of Taiwanese considered as a safety indicator. In order to accurately and precisely determine the concentrations of trace elements in samples, several analytical methods such as AAS, NAA and ICP-AES are suggested. This paper attempts to utilize all three methods to determine the concentrations of minor or trace elements in different types of tea leaves and the extracts percolated from them. The influence of fermentation processes on the concentration levels of minor or trace elements in tea samples is investigated. Because only free metal ions are bioavailable for the human body, it is necessary to determine their concentrations in drinking tea. The dissolution of trace elements in drinking tea is therefore studied by simulating the common Chinese style of tea percolation. Concentrations of thirteen elements including Zn, Mn, Ca, Cu, Ni, Al, K, Mg, Cd, Pb, Na, Co and Sc are determined.     

中国的中药微量元素研究 Ⅲ.微量元素：中药性效量化的物质基础

综述了中药四气、五味以及中药功效与微量元素的量化关系。中国中药微量元素研究结果表明,中药微量元素含量水平是决定中药性味的主要因素之一,也是判定中药功效的重要物质基础。     

胡芦巴炮制前后水煎剂中微量元素分析

对胡芦巴及其炮制品水煎剂中微量元素进行了测定，其中盐胡芦巴煎剂中微量元素(除Fe外)均呈上升趋势，炒胡芦巴中微量元素呈不同的高低变化，无规律可循。     

Use of Nuclear Techniques for the Measurement of Trace Elements in Food

Considerable interest in determining levels of trace elements in foods has occurred in the last twenty years. This interest comes from studies attempting to determine the role that elements play in the flavor and in the toxicology of food. Radiochemical methods, like instrumental neutron activation analysis (INAA), are common techniques used to determine dietary trace levels of various elements. A summary of other methods are also referenced in this updated review of past, present, and future uses of radiochemical methods to determine trace elements in food.     

An induction furnace for the determination of cadmium in solutions and zinc-base metals by atomic-absorption spectroscopy

An induction furnace coupled to a Unicam SP90 atomic-absorption spectrophotometer is described for the determination of traces of volatile elements in solutions and volatile matrices. The apparatus has been used to obtain calibration graphs for 1-20 and 50-750 ng of cadmium in microl-volumes of solution, the 228.8 and 326.2 nm resonance lines respectively being used, and to determine cadmium in 5-mg samples of zinc-base metals within the concentration range 5-400 microg g by using the less sensitive 326-2-nm line. A furnace temperature of 1,350 degrees was used. Data on accuracy and precision are presented. The apparatus could readily be used to determine trace elements in volatile materials at concentrations of 10-1000 ng/g .     

Trace element analysis of airborne particulate matters in relation to air pollution in Benin City, Nigeria

The methods of neutron activation analysis (NAA) and atomic absorption spectrometry (AAS) have been employed to determine the concentration levels of 18 trace elements in filter-collected airborne aerosols over an urban area in Nigeria. The highest concentrations measured in the samples were for Cl, Na, Al, Pb, Ca and Zn. The aerosol particles were found to contain higher concentrations of soil-derived trace elements, such as Al, Ti, K and Na than those derived from combustion and industrial activities such as As, Cd, Mn, Zn, Pb, Ni and Sb. The average precision of measurements varied between +/- 5.2% and 13% for most elements. Possible sources of the elements are also discussed.