火焰原子吸收光谱法测定煤矸石土种植的农作物中金属元素含量

采用干灰化法消化样品,火焰原子吸收光谱法测定了煤矸石土种植植物中的钙、镁、铜、锌、铁、锰等6种金属元素的含量。6种元素均在一定的质量浓度范围内与其吸光度呈线性关系,方法的检出限(3s)在0.002～0.017mg.L-1之间。回收率在96.8%～106.1%之间,相对标准偏差(n=6)在0.17%～4.25%之间。方法用于煤矸石土和沙土上种植的玉米、蚕豆和豌豆中6种金属元素含量的测定,结果表明:煤矸石土上种植粮食中6种元素的含量均高于沙土上种植的,矸石土壤种植的蚕豆中镁含量较高,豌豆中铁和锰含量较高。     

浊点萃取-火焰原子吸收光谱法测定菠菜中镁、锌和铜

在pH 8.0缓冲溶液中,以8-羟基喹啉为螯合剂,镁、锌和铜均与8-羟基喹啉生成螯合物,加入Triton X-100表面活性剂用浊点萃取分离富集菠菜样品中镁、锌和铜。分取部分表面活性剂相用乙醇定容至25mL,所得溶液直接用火焰原子吸收光谱法进行测定。对影响浊点萃取的因素和共存离子的干扰等进行了试验并予以优化。镁、锌和铜的检出限(3s/k)依次为0.057,0.064,0.032mg.L-1。应用此法测定了大叶菠菜和小叶菠菜中3种元素的含量,在两种样品中用标准加入法进行方法的回收试验,测得镁的回收率在93.3%～100.5%之间;锌的回收率在91.7%～97.9%之间;铜的回收率在94.0%～107.1%之间。     

微波消解-火焰原子吸收光谱法测定天然浓缩胶乳中的铜和锰

采用微波消解-火焰原子吸收光谱法快速测定天然浓缩胶乳中的锰、铜含量,各元素回收率在85.00%—111.00%之间.结果令人满意,并且方法简便,快速,无污染。     

火焰原子吸收光谱法测定彝药足壳中的微量元素

采用微波消解火焰原子吸收光谱法测定足壳中的微量元素。用HNO3+H2O2对足壳样品进行微波消解处理,采用火焰原子吸收光谱法测定足壳消解液中的Ca、Fe、Cu、Zn、Mn和Mg的含量。足壳中Ca的含量较高,各元素的回收率为93.0%—105.5%。此方法简单、准确,结果令人满意。     

5种抗肝癌中草药中锌、铜、锰、铁和镁的含量分析

采用火焰原子吸收光谱法测定了半边莲、半枝莲、山豆根、苦参和葛根5种抗肝癌中草药中Zn、Cu、Mn、Fe和Mg的含量。结果表明,各元素在所选的中草药中含量丰富。5种中草药中,半枝莲的Zn和Mn含量最高,半边莲的Cu和Fe含量最高,山豆根中Zn/Cu比值最高,而Mg的含量则均很高。该结果可为研究中草药的抗肝癌作用机理提供一定的信息。     

清炒枇杷叶中9种元素的测定

采用火焰原子吸收光谱法(FAAS)测定清炒枇杷叶中Fe、Cu、Mg、Ca、Mn、Zn、Ni、Cr、Pb 9种金属元素的含量。结果表明,9种元素的质量浓度在一定范围内均与其峰面积呈线性关系。该法用于清炒枇杷叶样品分析,9种元素测定值的相对标准偏差均小于3%(n=6),标准加入法测得9种元素回收率在95.7%—105.0%之间。采用火焰原子吸收光谱法测定清炒枇杷叶中9种元素稳定性好,结果准确可靠。     

屋顶花园种植的金银花、竹荪中铅和镉含量及其评价

采用火焰原子吸收光谱法测定屋顶花园种植金银花、竹荪中Pb、Cd的含量。该法简单、快速、灵敏度高,准确性好。回收率在93.6%—96.7%之间,相对标准偏差小于5%。实验结果表明:金银花中Pb、Cd的平均含量范围分别为16.46—16.60、0.19—0.23mg/kg,竹荪中Pb、Cd的平均含量范围分别为11.07—14.62、5.54—5.48mg/kg。     

FAAS测定提宗龙胆花中的7种矿质元素

采用火焰原子吸收光谱法对藏药提宗龙胆花中Cu、Zn、Fe、Mg、Ca、K、Na 7种矿质元素进行了测定。在选定的测定条件下,提宗龙胆花中各元素间相互干扰小,对测定结果无明显影响。方法的校准曲线线性关系良好(r=0.9944—0.9999),方法的回收率(n=6)在94.5%—107.7%之间。提宗龙胆花中K、Ca、Mg、Fe等元素含量均较高,研究结果为提宗龙胆这一传统藏药的合理开发与利用提供了可靠依据。     

Assessment of three digestion procedures for Zn contents in Pakistani soil by flame atomic absorption spectrometry

Evaluation of three different digestion procedures for accurate determination of elemental concentration in soils was undertaken. The digestion procedures, two leaching and a total dissolution processes were compared for twenty-one soil samples. The soil standard reference materials (SRMs), IAEA Soil-5 and IAEA Soil-7 were analysed for quality control purposes. Zinc (Zn) was analysed using flame atomic absorption spectrometry (FAAS). Precise analysis was accomplished in the SRM and soil samples, which was better than 4.7% for leaching and total dissolution procedure. Compared with the elemental concentration in soil samples, HF–HClO₄ procedure achieved greater accuracy, where as HNO₃–H₂O₂ and HNO₃–H₂SO₄–HCl procedures were comparable with slight variation in a few samples.     

Human Enamel and Dentin: Effect of Gender,Geographic Location and Smoking Upon Metal Concentrations

Abstract

The goal of this study was to determine the content of 12 metals in 23 samples of teeth from two cities in Bosnia and Herzegovina (B&H): Sarajevo, a capital city with heavy traffic, industrial facilities, and long periods of smog during winter and Bihac, a picturesque small city, with no industrialization, settled among vivid national park and rivers. The teeth were separated into enamel and dentin. Dissolution of samples was performed in concentrated HNO₃ with the addition of H₂O₂ followed by flame atomic absorption spectroscopy (FAAS) analysis. The results showed expected high contents of Ca, Na, Mg, and K, while elevated contents of Cu, Fe, and Zn were present in some samples. K and Na showed uniform distributions throughout enamel and dentin. Alkaline and earth-alkaline metals showed significant positive correlations. Zinc and manganese exhibited differences in the dentin content based on the place of residence. Zinc also displayed statistically significant differences between smokers’ and nonsmokers’ dentin samples. The differences were more pronounced between intra groups (within one sample) than for inter groups (within different groups, such as location, gender, and smoking).