火焰原子吸收光谱法连续测定菠萝中的铜、锌、铁、锰

探讨了用微波消化罐消化样品、以火焰原子吸收光谱法在同一体系中测定菠萝中微量元素铜、锌、铁、锰的方法。考察了硝酸、过氧化氢的不同用量以及消化时间长短的影响和在同一体系中钢、锌、铁、锰的彼此干扰情况。在选定条件下，检测限铜为0．0060μg/mL、锌为0．0074μg/mL、铁为0．0040μg/mL、锰为0．0090μg/mL，相对标准偏差1．9％-4．7％，回收率93．2％-105％。     

火焰原子吸收光谱法连续测定辣椒中的铜、锌、铁、锰

研究了辣椒中金属元素的含量和火焰原子吸收光谱法在同一体系中测定辣椒中微量元素铜、锌、铁、锰的方法,考察了硝酸、过氧化氢的不同用量的影响和在同一体系中铜、铁、锌、锰的相互干扰。为其进一步利用提供了一定依据,取得了较理想的效果。     

火焰原子吸收光谱法连续测定香蕉中的铜铁锌锰

研究了香蕉中的金属元素的含量和火焰原子吸收光谱法在同一体系中测定香蕉中微量元素铜、铁、锌、锰的方法，考察了硝酸、过氧化氢的不同用量以及消化时间长短的影响和在同一体系中铜、铁、锌、锰的相互干扰情况。在选定条件下铜检测限为0．064μg／mL，铁为0．275μg／mL，锌为0．157μg／mL，锰为0．187μg／mL，相对标准偏差为1．9％-4．7％，回收率为92．3％-105．0％。     

火焰原子吸收光谱法连续测定蘑菇中锰铜锌

用火焰原子吸收光谱法在同一体系中研究了蘑菇中微量元素锰、铜、锌的测定。方法简便、省时,精密度和灵敏度高。相对标准偏差2.4％～4.2％,回收率93.0％～104.5％,特征浓度锰为0.017μg·ml~(-1)/1％,铜为0.031μg·ml~(-1)/1％,锌为0.009μg·ml~(-1)/1％。     

几种药渣中铁、锌等元素含量的测定及再利用讨论

用原子吸收分光光度法测定几种药渣中铁、锌、铜、锰元素含量,为药渣再利用提供依据。实验表明,不同药渣中铁、锌、铜、锰元素含量不同,同一药渣中各元素含量也不同,且药渣中铁元素含量均高于其它几种元素;实验所测的药渣中平均含铁318.3mg/kg,锌、锰平均含量为34.31和39.13mg/kg。药渣中含有较为丰富的Fe,Zn,Cu,Mn元素,具有再利用价值。     

碘离子胁迫对绿豆萌发过程4种微量元素的影响

用火焰原子吸收法测定绿豆萌发过程中铜、铁、锰和锌的含量,研究不同含量碘离子胁迫对绿豆萌发过程中生理活动的影响。结果显示,各含量培养液所培养的绿豆芽苗中4种元素含量随培养时间的增加而显著降低,适当质量浓度的碘离子(20~80 mg/L)可以促进绿豆对铜、铁、锌的溶出,但碘离子质量浓度过高(100 mg/L)时将抑制绿豆对铜、铁、锰的溶渗出,培养末期绿豆均能从培养液中重新利用铁、锰、锌3种微量元素。     

六种生物制剂中锌、铜、铁、铬、锰、镍含量的测定

利用火焰原子吸收法直接测定生物制剂样品中锌,铜,铁,铬,锰,镍的含量。结果表明,六种生物制剂中以蚂蚁因子注射液中的铜、铜,铁,铬,锰,镍含量最高;不同的生物制剂中六种微量元素的含量有一定差别。     

火焰原子吸收光谱法连续测定番木瓜中铜锌铁锰

探讨了用微波消化罐消化样品、用火焰原子吸收光谱法在同一体系中测定番木瓜中微量元素铜、锌、铁、锰的方法。在微波消化罐内用硝酸和过氧化氢消化样品 ,具有试剂用量少免受污染、消化时间短等优点。考察了硝酸、过氧化氢用量以及消化时间的影响 ,以及在同一体系中铜、锌、铁、锰的干扰情况。在选定条件下 ,铜检出限为 0 .0 0 4 μg·ml- 1,锌检出限为 0 .0 0 4 8μg·ml- 1,铁检出限为 0 .0 0 3μg·ml- 1,锰检出限为 0 .0 0 6 μg·ml- 1,相对标准偏差为 1.7%～ 4 .9% ,回收率为 96 .8%～ 10 6 .6 %。方法具有简便、省时、准确、可靠的优点     

青海枸杞子中微量元素含量的测定

测定了青海枸杞子中锌、铜、锰、铅、砷、铁、硒等微量元素的含量。结果表明,青海枸杞子中含锌18.65μg/g,铜15.62μg/g,锰6.24μg/g,铅1.03μg/g,砷0.24μg/g,铁19.68μg/g,硒2.15μg/g,人体必需微量元素含量丰富,是枸杞具有极为重要的保健、防病、治病功能的重要原因之一。     

羊水中锌铜铁锰钙的测定

对61例妊娠晚期(孕34～40周)孕妇羊水进行了微量元素锌、铜、铁、锰及常量元素钙的测定.测定结果依次为:锌0.938±0.631 mg/L,铜0.178±0.156 mg/L,铁1.471±0.706 mg/L,锰0.047±0.017 mg/L,钙56.4±22.9 mg/L,为羊水微量元素研究提供了参考.     

癫痫与微量元素

评论了微量元素锌,铜,铁,锰与癫痫的关系。癫痫患者血浆中锌、铜、铁含量比正常对照组增高,锰含量降低。锌／铜比值较正常对照组明显降低。而癫痫患者发锌,铁含量比正常人对照组升高,发铜,锰含量降低。     

Fast ultrasound-assisted extraction of copper,iron, manganese and zinc from human hair samples prior to flow injection flame atomic absorption spectrometric detection

A dynamic ultrasound-assisted extraction procedure utilizing diluted nitric acid was developed for the determination of copper, iron, manganese and zinc in human hair taken from workers in permanent contact with a polluted environment. The extraction unit of the dynamic ultrasound-assisted extraction system contains a minicolumn into which a specified amount of hair (5–50 mg) is placed. Once inserted into the continuous manifold, trace metals were extracted at 3 mL min⁻¹ with 3 mol L⁻¹ nitric acid under the action of ultrasound for 2 min for zinc and 3 min for copper, iron and manganese determination, and using an ultrasonic water-bath temperature of 70 °C for zinc and 80 °C for copper, iron and manganese determination. The system permits the direct analysis of hair and yields concentrations with relative standard deviations of <3% (n = 11). The applicability of the procedure was verified by analysing human hair samples from workers exposed to welding fumes, and its accuracy was assessed through comparison with a conventional sample dissolution procedure and the use of a certified reference material (BCR 397, human hair).     

Direct determination of calcium,copper, iron,magnesium, manganese and zinc in amniotic fluid samples using inductively coupled plasma-atomic emission spectrometry

An inductively coupled plasma-atomic emission spectrometric method is reported for the determination of calcium, copper, iron, manganese, magnesium and zinc. Samples are introduced directly when a sheath gas device is used. An external calibration procedure is used. The standards are prepared in a matrix composed of 0.5% (w/v) albumin and 0.76% (w/v) sodium chloride. The procedure was evaluated with a standard reference material (NBS SRM 909 Human Serum); all the values obtained are in agreement with the certified values. Results obtained for the determination of zinc, calcium, magnesium, copper, iron and manganese in amniotic fluid samples are reported.     

A double-line sequential injection system for the spectrophotometric determination of copper, iron, manganese, and zinc in waters

A double-line sequential injection system was developed for the spectrophotometric determination of several metal ions in waters. The proposed double-line configuration was used to enable adding sample and chromogenic reagents as merging zones. The methodology was applied to the spectrophotometric determination of copper, iron, manganese, and zinc in samples of diverse origins at the range of 0.15-5.00, 0.10-10.0, 0.48-4.00, and 0.11-5.00 mg/L, respectively. Different chromogenic reagents and detection wavelengths were used. The chromogenic reagents for iron and manganese were 1,10-phenanthroline and formaldoxime, respectively. Copper and zinc were both determined using the analytical reagent zincon. Analytical characteristics of the methodology, such as manifold parameters, buffer pH, and reagent concentrations were optimized, and interference of some of the metal ions commonly present in water sample was assessed. Results of the analysis were in agreement with those obtained by atomic absorption spectrometry. Repeatability, expressed as the relative standard deviation for 10 consecutive injections of water samples, was lower than 6%. The determination rate was approximately 36/h.     

Study on Determination of Six Transition Metal Ions in Biological Samples by SPE and RP‐HPLC

This paper reports the utilization of solid phase extraction and the reversed‐phase high‐performance liquid chromatography (RP‐HPLC) for the determination of six transition metal ions (iron, cobalt, nickel, copper, zinc and manganese) in biological samples. The samples were digested by microwave digestion. The iron, cobalt, nickel, copper, zinc and manganese ions in the digested samples can react with 2‐(2‐quinolinylazo)‐5‐diethylaminophenol (QADEAP) to form colored chelates in pH 4.0 acetic acid‐sodium acetic buffer solutions and cetyl trimethylammonium bromide (CTMAB) medium. These chelates were enriched by solid phase extraction with C₁₈ cartridge. Then the chelates were separated on a Waters Nova‐Pak‐C₁₈ column (3.9 × 150 mm, 5 μm) by gradient elution with methanol (containing 0.5% of acetic acid and 0.1% of CTMAB) and 0.05 mol/L pH 4.0 acetic acid‐sodium acetic buffer solution (containing 0.1% of CTMAB) as mobile phase at a flow rate of 0.5 mL/min. The detection limits of iron, cobalt, nickel, copper, zinc and manganese are 3 ng/L, 4 ng/L, 2 ng/L, 4 ng/L, 8 ng/L, 10 ng/L, respectively. This method was applied to the determination of iron, cobalt, nickel, copper, zinc and manganese in biological samples with good results.     

火焰原子吸收光谱法测定汉中石韦中微量元素含量

应用火焰原子吸收光谱法测定了汉中石韦中Fe、Cu、Zn、Mn共4种微量元素的含量。结果表明,汉中石韦中含有丰富的Fe（12．91μg／g）、Cu（32．12μg／g）、Nn（22．45μg／g）、Zn（72．84μg／g）等人体必需的微量元素,精密度不大于3．24％,回收率在93．5～106．2％之间。方法可靠,准确。     

花椒中五种微量元素含量的测定

采用原子吸收光谱法,测定了河南太行山区花椒及椒皮、椒籽中锰、铁、铜、锌、铅的含量。结果显示,各元素在实验范围内,线性关系良好,回收率在92%~103%之间。花椒及椒皮、椒籽中均含有微量元素,花椒中锰、铁、铜、锌、铅的含量分别为78.851、90.868、11.571、18.818、0.086μg.g-1,其中锰、铁含量丰富,有害元素铅的含量极低。椒籽中铁、铜、锌的分布量大于椒皮;椒皮中锰的分布量大于椒籽。为探讨花椒的高药用价值提供了有力的证据,椒籽中铜、锌、铁含量高于椒皮,应大力开发利用。     

Determination of transition metal ions in tobacco as their 2-(2-quinolinylazo)-5-dimethylaminophenol derivatives using reversed-phase liquid chromatography with UV-VIS detection

This paper reports the utilization of solid-phase extraction and the reversed-phase high-performance liquid chromatography for the determination of six important transition metal ions: iron, cobalt, nickel, copper, zinc and manganese in tobacco with 2-(2-quinolinylazo)-5-dimethylaminophenol (QADMAP) as chelating reagent. Iron, cobalt, nickel, copper, zinc and manganese ions react with QADMAP to form colored chelates in the medium of acetic acid-sodium acetate buffer solution (pH 4.0). These chelates can be enriched by solid-phase extraction with Waters Sep-Pak-C18 cartridge, and eluted the retained chelates from cartridge with tetrahydrofuran. The chelates were separated on a Waters Nova-Pak-C18 column (150x3.9 mm, 5 microm) by gradient elution with methanol (containing 0.5% of acetic acid) and 0.05 mol/l pH 4.0 acetic acid-sodium acetate buffer solution as mobile phase at a flow-rate of 0.5 ml/min. The detection limits of iron, cobalt, nickel, copper, zinc and manganese are 10, 12, 8, 13, 17 and 22 ng/l, respectively. This method had been applied to the determination of iron, cobalt, nickel, copper, zinc and manganese in tobacco with good results.     

Determination of metals in foods by atomic absorption spectrometry after dry ashing: NMKL Collaborative Study

A method for determination of lead, cadmium, zinc, copper, and iron in foods by atomic absorption spectrometry (AAS) after dry ashing at 450 degrees C was collaboratively studied in 16 laboratories. The study was preceded by a practice round of familiarization samples and another round in which solutions were distributed and the metals were determined directly by AAS. The study included 5 different foods (liver paste, apple sauce, minced fish, wheat bran, and milk powder) and 2 simulated diets. A single analysis was carried out with each sample. Suitable sample combinations were used as split-level combinations for determination of the repeatability standard deviation. The reproducibility relative standard deviation for each of the elements ranged from 20 to 50% for lead concentrations of 0.040-0.25 mg/kg, from 12 to 352% for cadmium concentrations of 0.001-0.51 mg/kg, from 4 to 8% for zinc concentrations of 0.7-38 mg/kg, from 7 to 45% for copper concentrations of 0.51-45 mg/kg, and from 11 to 14% for iron concentrations of 4-216 mg/kg.