火焰原子吸收法测定珠光颜料中的有毒、有害元素

本文采用火焰原子吸收法对珠光颜料中的有毒、有害元素Cd、Pb的含量进行测定,该方法简便、快速,具有良好的精密度和准确度。Pb和Cd的相对标准偏差分别为:6.98%和4.53%,回收率分别为101.0%和99.64%。     

FAAS法测定碳酸镉中的杂质含量

本文采用火焰原子吸收法对碳酸镉中的K、Na、Ca、Mg、Pb、Zn和Fe 7种杂质元素进行测定,方法简单、快速、干扰小,具有较高的准确性和精密度。各元素的相对标准偏差为:2.69％～6.38％,加标回收率为95.0％～105％。     

介质辅助微波消解用于火焰原子吸收测定沸石分子筛中Na

利用介质辅助微波消解溶样,火焰原子吸收测量,准确测定分子筛中Na含量,加标回收率在92%~102%之间。介质辅助微波消解可使消解和赶酸一次进行,具有快速高效、酸消耗量小、安全清洁等优点。     

火焰原子吸收法测定硅酸盐材料中的钙和镁

本文采用氢氧化钠熔融硅酸盐样品,通过加入适当的干扰释放剂,用原子吸收法测定了硅酸盐样品中钙、镁的含量,方法具有操作简单快速和较高的精密度和准确度。     

火焰原子吸收光谱法测定铝及铝合金中镉

研究了火焰原子吸收光谱法测定铝及铝合金中镉的方法。此方法重现性好，干扰少，操作简便、快速。用盐酸－过氧化氢溶解试料，在盐酸介质中于原了吸收分光光度计228．8nm处，用空气一乙炔贫燃火焰进行测定。对测定条件、酸度影响、共存元素的干扰及消除进行了试验。并选一了最佳测定条件。试验表明：在0．12mol/L-2.4mol/L的盐酸溶液中测定镉效果最好，大量铝对镉的测定产生干扰，可通过配制铝基体标准工作曲线消除。Cr2O^2-7对镉的测定产生严重负干扰，10g/L的镧盐可消除Cr2O^2-7对镉的干扰，在选定的条件下进行试料分析，其RSD＝2．6％（n=6）加标回收率为97．0％－103．05，精密度和准确度都右到了满意的效果。     

火焰原子吸收光谱法测定锑矿中的锌量

文章采用火焰原子吸收光谱法测定锑矿中的锌量，主要讨论了酸介质和共存元素干扰的影响。该方法操作简便、迅速、稳定性好、精密度高，回收率在98％～102％之间，适用于锑矿中锌的分析。     

火焰原子吸收分光光度法测定蔬菜中铜锌铅

蔬菜经过处理之后,在选定条件下,应用火焰原子吸收分光光度法同时测定蔬菜中铜、锌、铅的含量,方法简便、快速.三种元素的含量分别为0.5128 mg/Kg、0.8023mg/Kg、0.1028 mg/Kg,精密度RSD小于1.4%,加标回收率在92.3%～97.2%之间,结果令人满意.     

Room temperature ionic liquid,cetyl pyridinium naphthenate,supported cloud point extractive separation and ultra trace determination of copper in blood and environmental samples

A new unconventional room temperature ionic liquid, cetyl pyridinium naphthenate (CPN) was synthesized and was ascertained by IR, NMR and CHN analysis. Cloud point extraction of Cu(II) was carried out by using CPN for a synergistic enhancement effect. Triton X 100 was used as surfactant in cloud point extraction and cloud point temperature was 750 C. Quantification was carried out by FAAS. The mean recovery, enrichment factor, tolerance limit, RSD, LOD and LOQ were found to be 99.8%, 40, 1000 ppm, 0.15%, 27 ppt and 93 ppt respectively. Method was validated by analyzing natural water and blood samples.     

黄皮叶中5种重金属元素的含量测定

黄皮叶药材经硝酸－高氯酸（10＋2）湿法消解后,采用原子吸收分光光度法测定铜元素含量,采用原子荧光法测定砷、汞、铅、镉元素的含量,建立了黄皮叶药材中5种重金属元素的含量测定方法,并测定了不同产地及批次黄皮叶药材中这5种元素的含量。5种元素回收率在94．25％～104．1％之间,8批黄皮叶中铜、砷和铅元素含量均低于国家限量标准,部分产地和批次药材中的重金属汞、镉元素含量高于国家限量标准。     

Determination of gold and palladium in environmental samples by FAAS after dispersive liquid–liquid microextraction pretreatment

A new dispersive liquid–liquid microextraction (DLLME) method is proposed for rapid separation, simultaneous extraction and preconcentration of gold and palladium at ultra trace amounts. The extraction of the analytes was performed in the presence of 5-[(E)-(2,6-diaminopyridine-3-yl)diazenyl]-1,3,4-thiadiazole-2-thiol (DAT) as chelating agent. Chloroform and acetone were used as extraction and dispersive solvents, respectively. The variables affecting the complexation and extraction conditions were optimized. The calibration curves were linear in the range of 1.1–85 and 0.9–124 μg L⁻¹ with the detection limits of 0.4 and 0.6 μg L⁻¹, and with the enrichment factors of 94 and 113 for Au and Pd, respectively. The precision (RSD%) was better than 2.4%. The accuracy of the method was verified by analysing the certified standard reference material (CDN–PGMS-10). The results show that the dispersive liquid–liquid microextraction pretreatment is a sensitive, rapid, simple and safe method for the separation/preconcentration of gold and palladium.