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分光光度法测定铝的进展 总被引：11，自引：0，他引：11
分光光度法以仪器价廉、操作简单、快速等优点而具有广泛的实用价值，成为测定铝常用的分析方法。除原有显色体系的应用扩展外，新显色剂及新的铝光度分析体系的建立，以及各种新型分析测试技术的发展促进了铝的光度分析技术灵敏度提高、选择性增强。文章综述了国内近年来（2000-2004年）普通分光光度法、动力学分光光度法、固相及析相富集分光光度法、导数分光光度法用于测定铝的研究进展。引用文献32篇。 相似文献
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国内铁的光度分析之进展 总被引：4，自引：0，他引：4
综述了近年来我国铁的光度分析的新的进展内容包括常规光度法,萃取离心光度法,动力学光度法,双波长光度法,固相光度法、等。引用文献１０６篇。 相似文献
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4,5-二溴苯基萤光酮和CTMAB分光光度法测定锰 总被引：1，自引：0，他引：1
锰的分光光度测定常用的有高锰酸盐法。最近有人合成了4,5-二溴苯基萤光酮(简称Br-PF),已用于铌、钨、钼、锡、钛、铬、钒等的分光光度分析。本文在pH9,用Br-PF-CTMAB光度法测定锰(Ⅱ),灵敏度高,ε_(590)=1.37×10~5,已应用于矿石及水样中微量锰的测定,得到了满意的结果。 实验部分 相似文献
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金的分光光度分析的进展 总被引：1，自引：0，他引：1
分光光度法在金的测定中应用广泛。随着高灵敏度显色剂的合成和新的测定方法的出现,该法已应用到化探样品中痕量金的测定。本文收集文献70篇介绍了近年来金的分光光度分析的进展情况, 相似文献
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<正> 偶氮氯膦Ⅰ作为镁的光度测定试剂,已引起分析界注意,并被成功地应用于球墨铸铁中镁的测定。本文试图将其应用于矿物原料分析中。在磷矿高钙低镁情况下,不分离干扰元素,以三乙醇胺掩蔽Fe、Al、Ti、稀土,以EGTA-Pb掩蔽钙,酒石酸抑制磷酸盐沉淀,于乙醇胺-盐酸缓冲介质中进行镁的直接光度法测定,获得初步成功。 相似文献
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吸光光度法(Absorption photometry)由于具有简便、快速、灵敏、选择性好,且可测元素多等优点,到目前人们仍乐于采用。近年来又出现了导数分光光度、双波长分光光度、流动注射分析、光导纤维化学传感器和以微电流扩展标尺的全差示光度法等新技术,致使这门分析技术至今仍具有强大的生命力。 差示光度法早已成为吸光光度法的一个重要分支。1949年Hiskey首次提出时主要用于高含量组分的精确测定。为了提高低含量组分的测定精度, 相似文献
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痕量铜的催化动力学光度分析进展 总被引：1，自引：1，他引：1
综述了1996－2000年测定痕量铜的催化动力学光度法，包括催化显色光度法、催化褪色光度法、阻抑动力学光度法、催化荧光光度法、催化化学发光光度法。 相似文献
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Keely BJ Harris PG Popp BN Hayes JM Meischner D Maxwell JR 《Geochimica et cosmochimica acta》1994,58(17):3691-3701
The tetrapyrroles in a highly immature Late Pliocene lacustrine sediment (Willershausen, Germany) show a simple distribution of both chlorin and porphyrin components as the free bases. The major components are C32 desoxophylloerythroaetioporphyrin (DPEP), a C33 bicycloalkano porphyrin, the chlorin analogue of the latter, and desoxophylloerythrin and its chlorin counterpart. The structure of the novel bicycloalkano chlorin was determined using a combination of two-dimensional phase-sensitive COSY NMR and nOe studies. Measurements of delta 13C and other data indicate that DPEP and the bicycloalkano porphyrin were derived from the chlorophyll(s) of photosynthetic organisms utilising a common source of CO2, probably diatoms. The occurrence of DPEP and other minor alkyl porphyrins indicates that the chlorophyll defunctionalisation pathway leading to these components can occur at low temperature and was probably biologically mediated, as was the condensation leading to the fused ring components. 相似文献
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Yutaka KANAI Noboru IMAI Shigeru TERASHIMA 《Geostandards and Geoanalytical Research》1986,10(1):73-76
The uranium contents of 36 geological reference samples have been determined by fluorimetry after ion-exchange separation, and spectrophotometry using Arsenazo III after solvent extraction with tri-n-octylphosphine oxide. The agreement between present results and published data is generally good. The methods of fluorimetry and spectrophotometry proved very convenient in the determination of uranium in geological materials. 相似文献
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Abelsonite has been obtained from five widely separated cores in the Green River Formation of Utah. Each occurrence was in fractures or bedding plane partings of lean oil shales. High resolution mass spectra show that the abelsonite samples are vitually identical from core to core and consist largely of the nickel complex of a C-31 porphyrin of DPEP type. 1H-NMR spectra of some of the samples have been recorded and are compared with spectra of several model nickel porphyrin complexes. From these spectra it is deduced that abelsonite is largely the nickel complex of a nor-DPEP. Abelsonite is believed to differ from nickel DPEP in having a methyl substituent in place of an ethyl substituent at either carbon 3 or 8. Abelsonite is shown not to have a hydrogen substituent on any pyrrolic carbon. A chlorophyll origin of abelsonite is thus indicated. Abelsonite appears to have been introduced into the fractures and bedding planes of the rocks in which it is found subsequent to their lithification, as porphyrins different from abelsonite were extracted from shales associated with abelsonite. 相似文献
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采用微型氢化物发生装置-冷原子吸收分光光度法测定了焊锡料及纽扣电池中的汞。在酸性介质中,用硼氢化钾将汞离子还原为汞原子,用载气将汞蒸气导入石英管,原子吸收分光光度计在波长253.7 nm处进行测定。选择了实验条件,对共存离子的干扰等进行了考察。方法的检出限为0.34 ng/mL,11次测定的相对标准偏差(RSD)小于6%,加标回收率为94.4%~104.7%。 相似文献
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巯基棉富集-分光光度法测定铂 总被引：2，自引：1，他引：1
样品溶解后,加入还原剂氯化亚锡及助吸附剂水合肼,用巯基棉吸附微量铂。吸附物灰化后,灰分用王水溶解,溶液用双十二烷基二硫代乙酰胺(DDO)分光光度法测定铂。方法检出限为0.2μg/g(10.0g样品),铂量在0~20μg/g线性关系较好。方法经国家一级标准物质验证,铂的测定结果与标准值相符,12次测定的相对标准偏差(RSD)小于10%。 相似文献
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The objective of this project is to quantify selected transitions in the diagenetic pathways of chlorophyll in deep ocean sediments, initially the aromatization from phorbides (unstable) to porphyrins (stable), using a model system which closely resembles the compounds identified in oceanic sediments. We determined the kinetic parameters for the aromatization of deoxomesopyropheophorbide a methyl ester (DOMPP) to deoxophylloerythrin methyl ester (DPE) in the presence of Cu(II) in a series of solvents ranging from highly polar and protic to nonpolar and aprotic, representing varying sedimentary environments. With Cu(II) in ethanol, the aromatization occurs through a pathway which involves a relatively slow initial formation of CuDOMPP, rapid aromatization to CuDPE, and finally an equilibrium reaction in the presence of clay which induces demetalation to form the free base DPE. Based on our model studies, only DOMPP, CuDPE and some DPE would be detected in significant quantities in more polar, protic sedimentary environments on a geologic time scale, although the story might be different with changed environment polarity. Our model studies may ultimately reconcile laboratory observations with those based on DSDP cores which appear to indicate that the diagenetic sequence proceeds from phorbide to free base porphyrin, followed by metalation of the porphyrin. 相似文献
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