电感耦合等离子体原子发射光谱法测定食品 添加剂硫酸锌中铁、锰、铅、镉

目的建立一种用电感耦合等离子体原子发射光谱法(ICP-OES)测定食品添加剂硫酸锌中铁、锰、铅、镉的方法。方法试样用水溶解后,采用电感耦合等离子体发射光谱法测定试液中铁、锰、铅、镉的含量,标准曲线法定量。结果试样中铁、锰、铅、镉的检测限分别为0.5 mg/kg、0.1 mg/kg、0.1 mg/kg、0.1 mg/kg。重复性和精密度好,RSD5%,回收率在90%~120%,符合国标要求。样品检测结果与国家标准方法的结果基本一致。结论本方法操作简便,结果准确可靠。适用于食品添加剂硫酸锌中多种杂质元素的高通量、快速检测。     

ICP-MS同时测定土壤中Cr、Ni、Cu、As、Tl和Pb

建立起HNO₃-H₂O₂-HF体系微波消解前处理样品,利用电感耦合等离子体质谱（ICP-MS）同时测定土壤中的铬（Cr）、镍（Ni）、铜（Cu）、砷（As）、铊（Tl）、铅（Pb）6种重金属元素含量的方法。该方法的相关系数在0.9996~1.000,相对标准偏差在0.669~3.02%,加标回收率为94.68~115.5%,检出限为2.004~312.4 ng/L,结果表明该方法满足重金属分析的要求。用建立起的方法测定了来自7个省45个产区烟田土壤中的Cr、Ni、Cu、As、Tl和Pb 6种重金属元素含量;与对应烟叶中的6种重金属含量相比,聚类分析结果表明不同省区间土壤中的重金属含量无明显差异,而烟叶中却差异明显。      

微波消解ICP-AES法测定苹果中的铅、砷、铜、镉、铬

采用密闭微波消解苹果样品,在优化微波消解条件和仪器测定条件的基础上,建立微波消解电感耦合等离子体发射光谱法同时测定苹果中铅、砷、铜、镉、铬5种元素的方法,在最佳试验条件下,回收率为98.3%.104.2%,RSD为1.7%～2.3%,方法简便、快速、准确.     

ICP-AES法测定茶叶及其浸泡液中的Cu、 Zn、 Fe、Mn、Pb等微量元素

用微波消解和沸水4次冲泡处理茶叶样品，采用ICP—AES法测定了池州4个茶叶产区茶叶样品与浸泡液中Cu、Zn、Fe、Mn、Pb等微量元素的含量，考察了有关数据，作了相关分析。实验精密度0．62％-1．76％，实验回收率95．1％～102．6％，结果良好。并采用类似方案处理国家茶树叶成份分析标准物质（GBW08513），进行了验证性实验，测定值在参考值范围内。结果表明，实验方案可靠，测定的数据可信，有关信息可以为当地茶叶种植和人们科学饮茶提供参考。     

连续光源原子吸收光谱法顺序测定蛤蚧中 6种金属元素

目的采用连续光源原子吸收光谱法顺序测定蛤蚧头、躯干、尾、四肢等不同部位中铜、铁、锌、锰、镍、铬等6种金属元素的含量。方法采用微波消解样品,连续光源原子吸收光谱技术多元素顺序测定的方法。结果优化条件下,在0.05~2.00 mg/L浓度范围内,各元素的吸光度与浓度呈良好的线性关系(相关系数r≥0.9993),本方法检出限在0.3~13.2μg/g之间,加标回收率在76.7%~100.0%之间。将该法应用于实际蛤蚧样品中上述元素的测定,测定结果表明,蛤蚧不同身体部位中6种元素含量有所不同,Fe、Mn元素在四肢中的含量最高,Cu、Zn、Cr元素在头部中含量最高,Ni元素在躯干中的含量最高。结论本方法满足实际样品的分析要求,且较之常规锐线光源原子吸收光谱技术在保证分析准确度的同时,大大提升了分析效率。本方法可以对中药重金属污染风险监测提供借鉴。     

The effect of storage of canned meat on concentration of the metals Fe, Cu, Zn, Pb, Sn, Al, Cd and Ni

Storage of canned foods may enrich the concentration of some metals. Because their toxic and other properties the presence of which in foods over certain limits is undesirable. Therefore we have determined the contents of Fe, Cu, Zn, Pb, Sn, Al, Cd and Ni over a 2 years' time of bovine, pork and veal meat. The results show a gradual increase in the concentration of Fe, Cu, Sn and Zn with time in the order pork greater than bovine greater than veal.     

The effect of storage of canned vegetables on concentration of the metals Fe, Cu, Zn, Pb, Sn, Al, Cd and Ni

The increase in the concentration of Fe, Cu, Zn, Pb, Sn, Al, Cd and Ni over a 2 year's time of strongly corrosive acidic vegetables (pickles) and weakly corrosive vegetables (peas, green beans, haricot beans, mushrooms) has been determined. The results show a considerable increase in Fe, Cu, Pb and Sn content with time, particularly for pickles, while the change in Al, Cd, Zn and Ni content was rather negligible.     

微波消解-火焰原子吸收光谱法测定百里香中微量元素

采用微波消解-火焰原子吸收光谱法(FAAS法),连续测定雷山县乌东村的百里香中的Zn,Fe,Cu,Mn,Ni,Cd,Cr,Pb含量。待测元素的最佳测试条件经过正交试验设计优化组合确定。结果表明,供试样品中微量元素Zn,Fe,Cu,Mn的含量分别为154.6,331.4,1.86,342.6mg/kg,而重金属元素Ni,Cd,Cr,Pb未检出。用此法节省时间和试剂,环境污染少,操作简便,精密度和准确度较高。     

ICP-MS测定饼干中的铅、砷、铬、镉、铜、锌、铁和锰

探讨了应用电感耦合等离子体质谱仪测定饼干中铅、砷、铬、镉、铜、锌、铁和锰8种重金属元素的方法。运用微波消解系统对样品进行消解,以铋、锗、钪和铟作为内标物,用ICP-MS对消解液进行检测,并采用国标方法对其结果进行验证。利用加标回收率试验和国家标准物质小麦(GBW 10052)检测试验考察了方法的准确性和可靠性。结果表明,该方法所测元素在标准溶液浓度范围内呈线性关系,相关系数均大于0.999,方法检出限在0.002~0.500 mg/kg之间,相对标准偏差均小于6.55%,本法与国标方法测量结果的相对偏差在3.73%~8.40%之间,加标回收率在88.0%~106%之间,标准物质的测定值与标准参考值符合要求。     

The effect of storage of canned juices on content of the metals Fe, Cu, Zn, Pb, Sn, Al, Cd, Sb and Ni

The increase in concentration of iron, copper, zinc, lead, antimony, aluminium, cadmium, tin and nickel over a 2 year's time of juices of peach (prunus persica), pear (pyrus communis), apricot (prunus vulgaris) and apple (malus pumila) was determined. The results show a considerable increase in Fe, Cu, Pb, Zn and Sn with time, while the change in Al, Cd, Ni and Sb is negligible.     

A simplified method for the extraction of the metals Fe,Zn, Cu,Ni, Cd,Pb, Cr,Co and Mn from soils and sewage sludges

The method described for digestion of soil samples with aqua regia is simple, flexible and safe to operate with large sample throughout. At least nine metals can be determined in the resulting solutions with errors of <5%. The results compare favourably with those from reflux aqua regia and averaged 88% of the certified total values for reference soils and 88% of those for reference sewage sludges.     

Determination of Cd,Co, Cu,Fe, Pb,Mn, Ni and Zn in diets: Development of a method

A method useful for the determination of cadmium, cobalt, copper, iron, lead, manganese, nickel and zinc in diets is described. Organic matter is destroyed applying a wet procedure, and element content is measured by flame atomic absorption spectroscopy (FAAS) in the case of copper, iron, manganese, nickel and zinc, and by graphite furnace (GF-AAS) in the case of cadmium, cobalt and lead. The matrix interference study is carried out. Values found for linearity, detection and quantitation limits as well as accuracy show that the described method is useful to determine the elements taken into account at usual levels in diets.     

Li, Cr, Mn, Co, Ni, Cu, Zn, Se and Mo levels in foodstuffs from the Second French TDS

In 2006, the French Food Safety Agency (AFSSA) conducted the Second French Total Diet Study (TDS) to estimate dietary exposures to the main minerals and trace elements from 1319 samples of foods typically consumed by the French population. The foodstuffs were analysed by inductively coupled plasma-mass spectrometry (ICP-MS) after microwave-assisted digestion. Occurrence data for lithium, chromium, manganese, cobalt, nickel, copper, zinc, selenium and molybdenum were reported and compared with results from the previous French TDS. The results indicate that the food groups presenting the highest levels of these essential trace elements were “tofu” (for Li, Mn, Ni, Cu, Zn and Mo),“fish and fish products” particularly “shellfish” (for Li, Co, Cu, Zn, Se and Mo), “sweeteners, honey and confectionery” particularly dark chocolate (for Cr, Mn, Co, Ni and Cu), “cereals and cereal products” (for Mn, Ni and Mo) and “ice cream” (for Cr, Co and Ni).     

Optimisation of microwave digestion for determination of Fe,Zn, Mn and Cu in various legumes by flame atomic absorption spectrometry

Fe, Zn, Mn and Cu levels in three Turkish legumes, kidney bean (Phaseolus vulgaris L.), lentil (Lens esculenta) and chickpea (Cicer arietinum), were determined by flame atomic absorption spectrometry. Dissolution conditions in the microwave‐assisted wet digestion method were studied by investigating several variables, including type of acid mixture, acid volume, digestion time, microwave power input and sample weight. Comparison with conventional wet acid digestion was also made. In order to check the element losses during digestion and the accuracy of the results, all tests were repeated after the addition of a spiked standard element solution to the legume sample. The microwave‐assisted digestion procedure optimised for kidney bean was adapted for lentil and chickpea. Fe, Zn, Mn and Cu concentrations (mg per 100 g sample) were determined in kidney bean as 6.27 ± 0.94, 2.23 ± 0.36, 1.64 ± 0.14 and 0.99 ± 0.19, in lentil as 8.24 ± 1.11, 2.46 ± 0.06, 1.17 ± 0.19 and 1.01 ± 0.28 and in chickpea as 6.00 ± 1.40, 2.21 ± 0.14, 1.60 ± 0.43 and 0.58 ± 0.18 respectively. Copyright © 2005 Society of Chemical Industry     

Determination of Cd, Co, Cu, Fe, Pb, Mn, Ni and Zn in diets: development of a method.

A method useful for the determination of cadmium, cobalt, copper, iron, lead, manganese, nickel and zinc in diets is described. Organic matter is destroyed applying a wet procedure, and element content is measured by flame atomic absorption spectroscopy (FAAS) in the case of copper, iron, manganese, nickel and zinc, and by graphite furnace (GF-AAS) in the case of cadmium, cobalt and lead. The matrix interference study is carried out. Values found for linearity, detection and quantitation limits as well as accuracy show that the described method is useful to determine the elements taken into account at usual levels in diets.     

电感耦合等离子体发射光谱法测定鲜榨西瓜汁中铁钙镁钾钠磷

用硝酸和过氧化氢的混合消解液对鲜榨西瓜汁进行封闭微波消解,采用电感耦合等离子体发射光谱仪（ICP-AES）法直接测定西瓜汁中微量铁、钙、镁、钾、钠、磷的含量。该方法检出限符合规范要求,方法回收率98.5%～101.8%,相对标准偏差（RSD）〈5.0%。该方法具有良好的准确度和精密度,且溶样过程无污染,方法简便、快速。     

Multi-element determination of Cu,Fe, Ni and Zn content in vegetable oils samples by high-resolution continuum source atomic absorption spectrometry and microemulsion sample preparation

The aim of this work was to evaluate the microemulsification as sample preparation procedure for determination of Cu, Fe, Ni and Zn in vegetable oils samples by High-Resolution Continuum Source Flame Atomic Absorption Spectrometry (HR-CS FAAS). Microemulsions were prepared by mixing samples with propan-1-ol and aqueous acid solution, which allowed the use of inorganic aqueous standards for the calibration. To a sample mass of 0.5 g, 100 μL of hydrochloric acid and propan-1-ol were added and the resulting mixture diluted to a final volume of 10 mL. The sample was manually shaken resulting in a visually homogeneous system. The main lines were selected for all studied metals and the detection limits (3σ, n = 10) were 0.12, 0.62, 0.58 and 0.12 mg kg⁻¹ for Cu, Fe, Ni and Zn, respectively. The relative standard deviation (RSD) ranged from 5% to 11 % in samples spiked with 0.25 and 1.5 μg mL⁻¹ of each metal, respectively. Recoveries varied from 89% to 102%. The proposed method was applied to the determination of Cu, Fe, Ni and Zn in soybean, olive and sunflower oils.     

ICP-MS analysis of a series of metals (Namely: Mg,Cr, Co,Ni, Fe,Cu, Zn,Sn, Cd and Pb) in black and green olive samples from Bursa,Turkey

Ninety-two black and green table olive samples from the Bursa, Turkey were analyzed. The olives were sampled from 56 brands, four processing methods and three packing types. The concentration of Mg, Cr, Co, Ni, Fe, Cu, Zn, Sn, Cd and Pb were measured by inductively coupled plasma mass spectrometry (ICP-MS). While the most concentrated element was Mg (125.11 ± 5.02), Co (0.09 ± 0.01) had the lowest concentration in tested olive samples. The levels of the ten metals studied are within safe limits. The data here obtained will be valuable in complementing available food composition data, and estimating dietary intakes of heavy metals in Turkey. The metals Mg, Fe, Zn, Sn and Pb presented significant differences (p < 0.05) in content between two types, hence processing method, brand and packing material must influence their content.