氢化物发生电热原子吸收法测食品中微量锑铋

本文将电热氢化物原子吸收光谱技术应用于食品中微量锑铋测定，检出限可达ｐｐｂ级。探讨了补测元素价态，预还原条件等因素对测定灵敏度的影响，并应用于罐头食品中微量锑铋分析。     

氢化物发生-电感耦合等离子体原子发射光谱法测定钢中微量砷、锑、铋

样品经盐酸-硝酸(3+1)溶液溶解,高氯酸冒烟后,用氢化物发生-电感耦合等离子体原子发射光谱法测定钢中微量砷、锑和铋的含量。研究了介质的酸度、硼氢化钾的浓度对3种元素信号强度的影响,并考察了其他元素对3元素测量的化学干扰。选择波长为189.042,217.58,223.06nm的3条谱线依次作为测定砷、锑和铋的分析线。砷、锑和铋的检出限(3s/k)分别为0.48,3.5,2.0μg.L-1。应用此法测定2个标准样品(GSBH40064-93和BH4265)中3种元素的含量,测定值与标准值相一致。     

火焰原子吸收光谱法测定粗铜中痕量铋、锑

粗铜样品经硝酸溶解,所得样品溶液中的铜离子在过量氨水中生成可溶性铜氨络离子,而铋、锑则以氢氧化铁和氢氧化镧作载体共沉淀,实现了富集铋、锑并与铜分离。基于此提出了原子吸收光谱法同时测定粗铜中的微量铋、锑。对浓盐酸的用量,硝酸铁和硝酸镧的加入量等试验条件进行了优化。铋的质量浓度在10 mg.L-1以内、锑的质量浓度在5 mg.L-1以内分别与其吸光度呈线性关系,检出限(3s)分别为0.06,0.04 mg.L-1,相对标准偏差(n=10)均小于2.0%。     

吸光光度法连续测定铜电解液中微量锑和铋

在多数情况下 ,锑和铋以有害痕量元素存在于电解液和金属材料中。在铜电解液中 ,锑和铋的含量决定电解铜的质量 ,当它们的含量达到一定值时 ,电解池中阳极 (粗铜 )的残极率上升 ,同时阴极 (精铜 )表面起瘤 ,从而造成精铜纯度下降 ,故需严格控制锑和铋的含量[1 ] 。吸光光度法测定锑和铋的方法虽有不少报道 ,但大多数是单独测定锑或铋 ,连续测定锑和铋[2 ] 的方法也有报道。为了提高分析速度 ,本文在文献 [3]的基础上 ,研究了在聚乙烯醇存在下 ,硫脲和硫氰酸钾掩蔽 Cu( )等干扰离子 ,碘化钾吸光光度法连续测定锑和铋的含量 ,操作简便 ,线性…     

铜电解液中锑铋的测定

电解液中锑、铋通常以沉淀法富集分离后,用碘化钾光度法测定铋;用结晶紫萃取光度法测定锑,方法不甚简便。锑、铋与碘化钾和硫脲均能生成黄色络合物,可用作各自的光度法测定,但两元素相互干扰严重。我们考察了酸度对锑、铋与碘化钾和硫脲络合物显色的影响。试验结果如图所示,铋络合物显色不受酸度影响,而锑络合物显色则明显受酸度影响。在     

乙酸乙酯萃取-氢化物发生-原子荧光光谱法测定金锭中锑和铋

1引言铋和锑是金锭中的主要杂质元素,依据国家金锭标准[1],铋和锑是必检项目。测试铋和锑的国家标准方法[2]不可同时测定,且检出限太高,对于高纯金锭无法做到精确测定。氢化物发生-原子荧光光谱法具有灵敏度高、检出限低、仪器相对便宜的优点,已广泛应用于冶金、地质和生物样品分析[3,4]。本研究采用乙酸乙酯萃取-氢化物发生-原子荧光光谱     

矿石中微量铅锡锑铋镉的光谱定量测定

用化学法测定矿石中微量铅锡锑铋镉的手续繁琐。文献曾利用戴帽电极分析氧化铌中杂质,但操作麻烦费时结果不够理想。本法采用带芯的戴帽电极,用焦硫酸钾:炭粉=1∶6为缓冲剂,试样与缓冲剂之比为1∶2,直流阳极激发,在一米光栅光谱仪上摄谱,用二级光谱,其测定下限:铅、锡、铋为1—3ppm,镉10ppm,锑30ppm。一次摄谱11个结     

HCl沉淀分离-氢化物发生-原子荧光光谱法测定银锭中锑和铋

采用氢化物发生-原子荧光光谱法同时测定银锭中铋和锑。用HCl沉淀分离银,滤液还原后利用氢化物发生-原子荧光光谱法测定铋和锑。方法检出限:Bi和Sb分别为0.02mg/kg和0.002mg/kg;回收率91%～96%;RSD小于1.2%。方法能同时准确测定铋和锑且检出限极低,测定结果与国家标准方法一致。     

4,5-二溴苯基萤光酮-溴化十六烷基三甲铵荧光熄灭法测定微量锑

自1978年Ahtohobnu等人合成4,5-二溴苯基萤光酮(DBPF)以来,它已作为一种灵敏的试剂广泛地应用于分光光度测定,文献[2]报道了用此试剂进行锑的光度法测定。但是这种试剂在荧光分析上的应用尚未见报道。本文利用了Sb(Ⅲ)对DBPF-CTMAB体系荧光的熄灭作用,建立微量锑的荧光分析方法,并应用于铜合金中微量锑的测定,获得良好的结果。     

双喷雾器在原子吸收光谱分析中的应用——微量锑的测定

氢化法原子吸收光谱测定砷、锑、铋等痕量元素是一种较灵敏的分析方法。但方法需要专门的仪器装置和惰性气体,线性范围窄且干扰多。为克服这些缺点,本文研究出一种双喷雾器原子化器并应用于测定岩石矿物中的微量锑,研究了用自己的装置测定锑的最佳条件、预还原剂的影响和溶液的稳定情况,对共存离子的影响及消除也进行了探讨。从而达到了简化手续、避免浪费和提高仪器利用率的目的。一、仪器装置及工作条件自制的GSD-1型原子吸收分光光度计,带有两     

Inter-element interferences in the determination of arsenic and antimony by hydride generation atomic absorption spectrometry with a quartz tube atomizer

The interferences between arsenic and antimony on each other during the hydride generation atomic absorption spectrometry (HGAAS) determination of arsenic and antimony using a quartz tube atomizer (QTA) were examined. In order to eliminate or reduce such interferences by selective heat decomposition of arsine and stibine, a Pyrex adsorption U-tube trap containing glass wool was placed between the drying tube and the quartz tube atomizer. Although at 250 °C stibine decomposes and is held almost completely by the trap, arsine is also decomposed to an extent of 24% and, therefore, thermal decomposition is not useful to eliminate antimony interference on arsenic determination. The effect of coating the glass wool in the U-tube with antimony on the arsenic suppression of the antimony signal was studied. The results showed that the antimony coating in the U-tube could not hold arsenic effectively and its interference on the antimony signal could not be eliminated by this means. In the second part of the study, oxygen was supplied to the quartz tube atomizer during atomization in order to study the effect of supplying oxygen on the antimony signal and on the interference of arsenic in the antimony determination. Sensitivity was increased in the presence of oxygen and interferences of arsenic on antimony determination was decreased by about 10% when oxygen was supplied. It was also observed that the extent of interferences depended mainly on the interferent concentration rather than the analyte concentration.     

Determination of Antimony(III) and Total Antimony in Aqueous Samples by Electrothermal Atomic Absorption Spectrometry After Dispersive Liquid–Liquid Microextraction (DLLME)

Dispersive liquid–liquid microextraction (DLLME) technique combined with electrothermal atomic absorption spectrometry (ET-AAS) was proposed for determination of antimony(III) and total antimony at very low concentrations in water samples. The N-benzoyl-N-phenylhydroxylamine (BPHA) was used as a chelating agent, and chloroform and ethanol were used as extraction and disperser solvents, respectively. The effect of various experimental parameters on the extraction and determination was investigated. The detection limits (3σ) were 0.005 μg L^?1 for Sb(III) and 0.008 μg L^?1 for total Sb. The developed method was applied successfully to the determination of Sb(III) and total Sb in natural water samples.     

氢化物发生-原子荧光光谱法同时测定水中砷和锑

建立在硝酸介质中用氢化物发生-原子荧光光谱法同时测定水中砷和锑的方法。优化了仪器工作条件、酸度、硼氢化钾及还原剂浓度。砷、锑的线性范围为0～10．0μg／L;检出限分别为0．02,0．01μg／L;测定结果的相对标准偏差分别为1．77％～3．72％,2．95％～4．87％（n=6）;加标回收率分别为98％106％,96％105％。该法操作简便,灵敏度高,快速,便于推广,适用于水中砷和锑的同时测定。     

Differential determination of antimony(III) and antimony(V) by solvent extraction-spectrophotometry with mandelic acid and Malachite Green, based on the difference in reaction rates

Highly sensitive and reproducible extraction-spectrophotometric methods for differential determination of antimony(III) and antimony(V) were investigated. It was found that antimony(III) reacts easily with mandelic acid to form a complex anion extractable into chlorobenzene with Malachite Green from weakly acidic media (pH 2.2-3.5) at room temperature, whereas antimony(V) reacts only slowly, and heating for 15 min at 45 degrees is needed to obtain maximum sensitivity. The significant difference between the rates of reaction of mandelic acid with antimony(III) and antimony(V) was applied to the differential determination of these two species. The calibration graph was linear over the range 0.15-6.0 mug for antimony(III), and 0.20-10 mug for antimony(V).     

滤纸还原–硫酸铈滴定法测定含锑铅精矿中锑

建立滤纸还原-硫酸铈滴定法测定含锑铅精矿中锑含量的方法。采用硫酸、硝酸溶解样品,以滤纸作还原剂,在盐酸介质中,用磷酸掩蔽高价铁,以甲基橙和亚甲基蓝为指示剂,于80~90℃下,用硫酸铈标准溶液滴定至溶液突变至亮蓝色(铁含量高时为黄绿色)为终点。在实验条件下对3个含锑铅精矿样品进行分析,测定结果的相对标准偏差为0.7%~2.2%(n=8),加标回收率为95%~106%。分别采用该方法和锑矿石中锑的国家标准分析方法GB/T 15925-2010对含锑铅精矿样品进行测定,两种方法的测定值基本一致,相对误差为1.4%~4.5%。该方法准确度高,精密度好,成本低,适用于铅精矿中锑含量的测定。     

Spectrofluorimetric Determination of Antimony

Abstract

A spectrofluorimetric procedure for the determination of micromolar concentrations of antimony(III) was devised based on its reduction of cerium(IV) to produce fluorescent cerium(III). The method was optimized and the reaction was fast enough in hydrochloric acid media without the need for iodide or osmium(VIII) as catalysts. Linear calibration graphs were obtained in the range 1-10 10^?6M. The standard deviation for determining 5 × 10^?6M antimony(III)(10 times) was 1.43 × 10^?7M and the relative error was -3.4 %. The method was applied to the determination of antimony(III) in its mixture with antimony(V), total antimony was later determined after reduction with mercury metal in deoxygenated solutions. The affect several reducing agents on the determination of antimony-was also examined.     

氢化物发生-双道原子荧光光谱法同时测定钢中砷和锑

建立了一种氢化物发生双道原子荧光光谱法同时测定钢中痕量砷和锑的方法．对实验条件进行了优化,在最佳工作条件下,砷和锑的检出限分别为0．012ng／g和0．034ng／g,RSD分别为1．24％和1．97％．将本法应用于钢中的砷和锑的测定,采用加标回收实验控制方法的准确性,砷的回收率为96％～98％,锑的回收率98％～102％．     

Determination of antimony content in natural water by graphite furnace atomic absorption spectrometry after collection as antimony(III)-pyrogallol complex on activated carbon

Antimony(III) was preconcentrated on activated carbon (AC) as the antimony(III)–pyrogallol complex. Prior to the preconcentration, antimony(V) was reduced to antimony(III) with potassium iodide and ascorbic acid. The antimony adsorbed on the AC was determined by graphite furnace atomic absorption spectrometry as an AC suspension. The method was applied to differential determination of trace amounts of antimony in natural water.     

Selective separation and differential determination of antimony(III) and antimony(V) by solvent extraction with N-benzoyl-N-phenylhydroxylamine and graphite-furnace atomic-absorption spectrometry using a matrix-modification technique

If copper is used as a matrix modifier for the determination of antimony, the ashing temperature for antimony in aqueous solution and a BPHA-CHCl(3) extract can be raised to 1300 degrees and 1100 degrees , respectively. A selective procedure for separating antimony(III) from antimony(V) by extraction with BPHA in chloroform is described, along with the conditions for preserving trace antimony in water samples. The recommended method has been applied satisfactorily to the determination of antimony(III) and antimony(V) in various types of water at sub-ng/ml levels.     

共价氢化物与汞离子反应的研究 Ⅰ 痕量锑高灵敏度的分析新方法

本文提出了一个氢化物发生一冷原子荧光法间接测定痕量锑的新方法。考察了各种实验条件,并将此法用于水及沉积物标样分析,结果令人满意,对水中锑检出限为0.1μg/L,回收率96％～102％。