悬浮液进样-火焰原子吸收光谱法直接测定湘玉竹中铜

用悬浮液进样-火焰原子吸收光谱法测定湘玉竹中铜,样品经烘干、研磨、过筛配制琼脂悬浮液,直接喷入空气-乙炔火焰测定.本法测定加标回收率为97.8%~99.7%.方法的RSD小于2.5%(n=6),检测限为0.0038μg.mL-1.     

火焰原子吸收法测定人发中钙、镁、铜、铁、锌含量

以硝酸－双氧水为混合溶剂，湿法溶解发样，考查了人发中共存离子的干扰情况，并对钙在空气－乙炔火焰中电离，提出了抑制的方法。人发５种元素回收率分别为钙１００．７％，镁１０２．０％，铜１０４．０％，铁１０２．０％，锌１０３．０％。     

一氧化二氮-乙炔火焰原子吸收光谱法测定7715D高温钛合金中的铝

论述了运用一氧化二氮 -乙炔火焰原子吸收光谱法测定 771 5 D高温钛合金中的铝含量。介绍了铝的最佳测定条件及呈良好线性范围的浓度 ,并对样品消化处理条件、干扰因素进行了综合考虑。该方法灵敏度高 ,干扰小 ,选择性和重现性好。同时具有方法步骤简单、操作容易掌握、分析周期短等优点。对样品进行 6次测定的结果表明 ,相对标准偏差均小于 1 .0 % ;标准加入回收率均在97%～ 1 0 2 %范围内。完全适用于实验室质量控制的要求。同时提供了一种非常实用的仪器分析方法     

微波消解-光谱法测定果蔬中的砷和铜

针对伊犁地区出口水果、蔬菜,采用微波消解仪一次性消解前处理,利用原子荧光法、火焰原子吸收法分别测定砷、铜两种微量元素。经过回收率和精密度试验,并以由地球物理地球化学勘探研究所生产的苹果（ GBW10019）标准品和菠菜（GBW10015）标准品进行回收试验,结果表明：标准样品的测定值均在参考值范围内,砷、铜两种微量元素的相对标准偏差在2.16％～6.96％之间。该方法实现了铜、砷元素的快速检测,且准确可靠能够满足实验要求。     

几种猕猴桃中痕量元素铁和锌的测定

通过一系列实验对仪器的参数进行了优化,对样品的消解剂进行筛选,建立了测定猕猴桃中铁锌元素含量的微波消解-火焰原子吸收光度分析方法。为了验证该方法的可靠性,又进行了加标回收试验,方法的回收率在95%~107%之间。测定结果为猕猴桃样品的干重铁含量在55.3~117.5μg/g之间,湿重铁含量在8.17~20.5μg/g之间,干重锌含量在25.6~52.2μg/g之间,湿重锌含量在3.78~7.16μg/g之间。     

提高火焰原子吸收光谱法测定重过磷酸钙低含量铅的稳定性实验

对火焰原子吸收光谱测定重过磷酸钙中小于50μg/g的铅进行了仪器工作条件优化实验,包括分析线、灯电流、狭缝宽度、燃烧头高度、燃气流量和助燃体积流量比V(C_2H_2)/V(Air)等,优化条件下样品测定结果的标准偏差小于4 mg/kg,测定的稳定性和准确性得到提高。     

Optimization of a slurry dispersion method for minerals and trace elements analysis in infant formulae by ICP OES and FAAS

Infant formula developed by manufacturers requires a rigorous control of composition, particularly those elements added routinely in an attempt to mimic the mineral composition of human milk. A total of 97 different types of powdered infant formulae (preterm, adapted starter, adapted follow-up, toddler, specialised and soy-based formulae) commercially available in Spain were studied. It is noteworthy great differences in mineral (Ca, P, Mg) and trace element (Zn, Fe, Cu, Mn) contents found between analysed and listed in label information. The development of a fast, simple and direct slurry method for the determination of these essential micronutrients in infant formula by inductively coupled plasma optical emission spectrometry (ICP OES) and flame atomic absorption spectrometry (FAAS) was performed in order to help in quality control tasks. Infant formula samples were solubilised using different amounts of several different solvents. An addition of 250 μL of a solution 10% tetramethylammonium hydroxide and 25% ammonium hydroxide were required for the accurate quantification of Ca and P, Mg, Zn, Fe, Cu and Mn, respectively. The standard reference material 1549 non-fat milk powder was solubilised to compare the validity of assayed methodology following slurry nebulisation and traditional microwave-assisted acid digestion method. Good agreement of the analytical results by both ICP OES and FAAS, with the certified values was obtained. Method performance parameters (accuracy, precision and methodological detection limits) were determined for studied elements to check the quality and usefulness of the optimised slurry method. The analytical procedure was applied successfully to the analysis of a representative group of infant formulae. Levels of analysed elements were graphically represented, showing an acceptable comparability between slurry and acid-mineralisation method set by linear correlation coefficients and slopes close to the unit. The described simple and slurry method is appropriate, as an attractive alternative, for routine control analysis of added essential elements in infant formulae regardless of predominant protein type used in manufacture.     

Iron determination by FAAS in fish feed and feces after ultrasound-assisted extraction

This paper proposes a method to determine iron in samples of fish feed and feces using ultrasound in the extraction of the analyte and in subsequent quantification by flame atomic absorption spectrometry. Using HCl 0.10 mol L⁻¹ as the extraction solution, the optimal conditions of extraction were found to be: granulometry of the sample <60 μm; a sonication time of five cycles of 10 s and sonication power of 136 W. The method was applied in studies of the availability of iron in four food sources used in the diet of Nile Tilapia. The results obtained with the proposed extraction method allowed us to calculate the coefficients of apparent digestibility of iron in the food sources, which was not possible when using results obtained from samples mineralized by acid digestion.     

石墨炉原子吸收法用于测定啤酒中的铅

研究了采用石墨炉原子吸收法测定啤酒中的重金属铅的含量,研究结果表明:该方法的检出限为0.22μg/L,相对标准偏差为0.56%～3.73%,样品加标回收率为96.45%～103.14%,测定结果的精密度和准确度令人满意。通过对市场上的9种啤酒进行抽样检测,检测结果表明啤酒中的铅含量为0.0343～0.0762mg/L满足国家相关标准的要求。     

液膜富集——火焰原子吸收光谱法测定环境样品中痕量镍

研究了以二（2－乙基己基）磷酸（P204）－山梨糖醇单油酸酯（Span80）－煤油－H2SO4组成的液膜体系用于分离富集镍，结合火焰原子吸收光谱法进行镍的测定，得出了液膜分离的各项最佳条件。该方法应用于测定水系沉积物和环境水样中痕量镍，经过1次提取分离，富集倍数可达到20倍，回收率95％以上，相对标准偏差为1．7％（n=8），可测定ng/mL级的镍，结果满意。