共查询到20条相似文献,搜索用时 15 毫秒
1.
2.
Carbon disulfide (CS2) was determined at trace levels by its induction effect on the reaction of triiodide with azide in acidic media. The reaction was monitored spectrophotometrically by the decreased absorbance of triiodide over a period of 30 - 180 s from the initiation of the reaction at 350 nm, with calibration linear range of 0.020 - 1.870 microg/ml CS2. The limit of detection is 0.013 microg/ml CS2. A carbon-active column was used for sample solution clean up. The proposed method was successfully applied to the determination of trace carbon disulfide in natural water. 相似文献
3.
Shun Sekimoto Kentaro Hirose Masaki Takimoto Tsutomu Ohtsuki Seiichi Shibata 《Journal of Radioanalytical and Nuclear Chemistry》2012,291(2):457-459
Trace amount of nickel in high-purity iron and iron oxide samples was determined by photon activation analysis (PAA) using
the Electron Linear Accelerator at the Research Center for Electron Photon Science, Tohoku University. It was confirmed that
about 0.015 μg of nickel in the high-purity iron oxide sample could be determined with an experimental uncertainty of 20%
by PAA, that is, it was possible to determine 1% of nickel at least in a few μg of cosmic spherules. PAA was applied to the
nickel-determination in cosmic spherules. Nickel in cosmic spherules was determined by PAA more accurately than by instrumental
neutron activation analysis done in a reactor neutron spectrum with the fluence rate ratio of thermal neutrons to fast of
4–5 which has so far been applied to the analysis of spherule samples. Additionally, trace amount of nickel in the reference
material Giant Clam JCt-1 supplied by the Geological Survey of Japan was determined by PAA with radiochemical treatment. 相似文献
4.
非水溶剂中微量溶解氧的测定 总被引:1,自引:0,他引:1
利用分子氧对联吡啶钌的荧光有淬灭作用的特点,建立了一种灵敏的测定非水体系中微量溶解氧的方法.以甲基三甲氧基硅烷(MTMS)和四乙氧基硅烷(TEOS)为共聚前驱体,以联吡啶钌为荧光指示剂制备了新的有机改性溶胶-凝胶氧敏感膜,并将该膜用于有机体系中溶解氧的测定,响应时间小于30 s.对1,3-丁二醇,丙二醇,丙三醇,PEG-400中溶解氧的测定线性范围分别为0~73.6 mg/L,0~116.4 mg/L,0~205.7 mg/L,0~165.0 mg/L;RSD(n=6)分别为3.5%.5.4%,2.8%和1.0%.该法可用于有机溶剂中溶解氧的测定. 相似文献
5.
The sub- and super-equivalence methods of isotope dilution analysis (SSE-IDA) have been compared with substoichiometric isotope dilution analysis (Subst-IDA) for the determination of a trace amount of antimony by means of a redox reaction. For this comparison, the difference between the amount separated and the theoretical value was determined under various conditions. Under conditions in which the substoichiometric reaction and separation gave unsatisfactory results, accurate determination could still be performed by SSE-IDA. The reason for this is discussed. 相似文献
6.
The substoichiometric method is applied to simple radiometric analysis. Two methods-the standard reagent method and the standard
sample method-are proposed. The validity of the principle of the methods is verified experimentally in the determination of
silver by the precipitation method, or of zinc by the ion-exchange or solvent-extraction method. The proposed methods are
simple and rapid compared with the conventional superstoichiometric method.
The University has moved and changed its name and address as lollows: Institute of Chemistry, The University of Tsukuba 300-31
Sakura-mura, Ibaraki Japan. 相似文献
7.
8.
We report on the elaboration of macroporous antimony film electrodes. The strategy to create macroporous electrodes is based on the replication of colloidal crystal templates. These electrodes of controlled porosity show an increased internal electroactive area and a significantly improved electrochemical performance. The application of this novel electrochemical sensor for the sensitive quantification of traces of heavy metals has been demonstrated in combination with differential pulse anodic stripping voltammetry in model solutions. 相似文献
9.
Determination of trace amounts of antimony in geological materials by atomic absorption spectrometry
For the determination of traces of antimony in rocks and soils, dried samples are heated with ammonium iodide to volatilize antimony triiodide, which is then taken up with 10% hydrochloric acid and extracted into TOPO-MIBK. Analysis is completed by atomic absorption spectrometry. The range is 1.0–40 p.p.m. Sb, the relative standard deviation being about 10–4%. Up to 20% iron and 2000 p.p.m. Cu, Pb, Zn. Sn, As or Hg do not interfere. 相似文献
10.
建立了双道氢化物发生-原子荧光光谱法同时测定核电用钢中痕量砷和锑的新方法。用王水溶解样品,以2.0 g/L L-半胱氨酸溶液作为预还原剂,在低酸度条件下实现对砷、锑的预还原。用20 g/L硼氢化钾溶液作为还原剂,氢化物发生反应在0.5 mol/L乙酸介质中进行。砷、锑的质量浓度在40μg/L范围与相应的荧光强度呈线性关系,方法的检出限(3s/k)分别为0.032μg/L和0.022μg/L。应用此方法同时测定了核电用钢及不锈钢标准样品中的砷锑含量,并与电感耦合等离子体原子发射光谱法的分析结果作了对比,测定值与标准样品的标准值相符,结果的相对标准偏差(n=8)均小于5.0%。 相似文献
11.
12.
建立了吸附柱分离-离子色谱法测定锑样中微量硫的方法.方法采用王水,氢溴酸,浓HCl等试剂将锑样溶解,并使锑样中的硫转化为SO42-,低温加热蒸干,使锑完全挥发.然后在氧化铝柱上过柱,用氨水洗脱,最后将处理好的样品溶液注入离子色谱系统进行分析测定.优化了离子色谱操作条件,以流速为1.2 mL/min的3.5 mmol/L的Na2CO3与1.0 mmol/L的NaHCO3作为淋洗液,对标准液和样品溶液的测定,线性范围为0.2~100 μg/mL,检出限为0.2 μg/mL,回收率为92.9%~103.1%,该法适合锑样中微量硫的测定. 相似文献
13.
14.
15.
微型氢化物发生-原子吸收光谱法测定纺织品中的痕量砷和锑 总被引:1,自引:0,他引:1
采用三毛细管微型在线氢化发生技术和装置, 建立了氢化物发生-电热石英管原子吸收法测定纺织品中痕量As、 Sb的分析方法. 研究了共存离子对As、 Sb检测的干扰及消除方法. 结果表明: 该方法除Co、 Sn对As和Ni对Sb有干扰外, 其它干扰元素允许量都较大. 采用酒石酸和KI混合掩蔽剂可抑制Co、 Sn对As和Ni对 Sb的干扰. As和Sb的检出限分别为0.7和0.4 ng/L, 已用于测定纺织品中痕量As和Sb的分析. 相似文献
16.
17.
Summary A method is described for the determination of trivalent antimony. It depends on the oxidation of Sb3+ to Sb+ with KMnO4 in sulfuric acid solutions (0.72-3.4N H2SO4) in the presence of fluoride ions and at temperatures below 50°. Amounts of antimony ranging from 15.7gmg to 61 mg can be determined accurately.
Zusammenfassung Eine Methode zur Bestimmung von Sb (III) wurde beschrieben. Sie beruht auf der Oxydation zu Sb(V) mit Permanganat in schwefelsaurer Lösung (0,72-3,4N H2SO4) in Gegenwart von Fluorid bei Temperaturen unter 50° C. Mengen zwischen 15,7gmg und 61 mg Antimon lassen sich genau bestimmen.相似文献
18.
19.
20.
T. Bereznai 《Analytica chimica acta》1980,119(1):175-178
New types of correction for chemical yield and counting geometry in conjunction with the comparator method provide significant improvements in reproducibility and sensitivity compared to direct neutron activation analysis. 相似文献