Annali di chimica最新文献_第2页

Kinetic-Catalytic and Spectrophotometric Determination of Hg(II) Using its Catalytic Effect on Ligand Substitution Reaction between Hexacyanoferrate(II) and Pyrazine 六氰铁酸盐(II)与吡嗪之间配体取代反应的动力学催化及光度法测定汞(II

Annali di chimica Pub Date : 2007-11-20 DOI: 10.1002/adic.200790103

Radhey Mohan Naik, Pradeep Kumar Singh, Richa Rastogi, Ruchi Singh, Abhinav Agarwal

{"title":"Kinetic-Catalytic and Spectrophotometric Determination of Hg(II) Using its Catalytic Effect on Ligand Substitution Reaction between Hexacyanoferrate(II) and Pyrazine","authors":"Radhey Mohan Naik, Pradeep Kumar Singh, Richa Rastogi, Ruchi Singh, Abhinav Agarwal","doi":"10.1002/adic.200790103","DOIUrl":"10.1002/adic.200790103","url":null,"abstract":"A sensitive, simple and rapid spectrophotometric method for the determination of mercury (II) based on its catalytic effect on the abstraction of coordinated cyanide from hexacyanoferrate (II) by pyrazine has been developed using fixed time procedure. The extent of the reaction is monitored spectrophotometrically by measuring the increase in absorbance at λmax=440 nm of the yellow colored complex, [Fe(CN)5Pz]3− under the reaction conditions; [Fe(CN)6]4−=7.2×10−3 mol L−1, [Pz]=3.75×10−4 mol L−1, temperature=25.0±0.1 °C, pH= 2.50±0.02 and I=0.1 mol L−1(KNO3). The experimental rate data under the conditions used in the present study exhibited a linear dependence between absorbance and [Hg2+] catalyst in the range 5.065–50.15 ng mL−1. The detection limit is found to be 4.01 ng mL−1. The maximum relative standard deviations and percentage errors for mercury(II) determination are found to be 2.2 and 3 % respectively. The percentage recoveries are found to be in the range of 99–102 %. Analytical data fordetermination of mercury(II) is presented together with the application of proposed method in water spiked synthetic mixtures. The validity of the proposed method is tested by comparing the results obtained by present method with atomic absorption spectrometry.","PeriodicalId":8193,"journal":{"name":"Annali di chimica","volume":"97 11-12","pages":"1169-1179"},"PeriodicalIF":0.0,"publicationDate":"2007-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/adic.200790103","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75345468","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Investigation of Distribution of Heavy Metals between Blood Plasma and Blood Cells 重金属在血浆和血细胞中的分布研究

Annali di chimica Pub Date : 2007-11-20 DOI: 10.1002/adic.200790118

Stasys Tautkus, Algimantas Irnius, Danute Speiciene, Jurgis Barkauskas, Aivaras Kareiva

引用次数: 5

Highly Thiocyanate-Selective Membrane Electrode Based on the Bis(Benzoylacetone) propylenediimine Copper(II)Complex 基于双(苯甲酰丙酮)丙二亚胺铜(II)配合物的高硫氰酸盐选择性膜电极

Annali di chimica Pub Date : 2007-11-20 DOI: 10.1002/adic.200790105

Behzad Rezaei, Soraya Meghdadi, Vajihe Nafisi, Saeid Bagherpour

{"title":"Highly Thiocyanate-Selective Membrane Electrode Based on the Bis(Benzoylacetone) propylenediimine Copper(II)Complex","authors":"Behzad Rezaei, Soraya Meghdadi, Vajihe Nafisi, Saeid Bagherpour","doi":"10.1002/adic.200790105","DOIUrl":"10.1002/adic.200790105","url":null,"abstract":"A potentiometric thiocyanate-selective sensor based on copper(II) bis(benzoylacetone)propylenediimine complex as a new neutral carrier for a thiocyanate-selective electrode is reported. The response mechanism is discussed in view of the UV spectroscopy technique. The sensor displays a near Nernestian slope of -57.4 ± 0.5 mV per decade. The working concentration range of the electrode is 8.0×10-7-1.0×10-1 M with a detection limit of 7.4×10-7 M. The response time of the sensor in the all concentration ranges is very short (5-10 s). The response of the sensor is independent of pH, in the pH range of 1.7–11.5. The best performance was obtained with a membrane composition of 32.69 % PVC, 57.34 % dibutyl phthalate, 6.82 % complex and 3.15 % methyltrioctylammonium chloride (MTOAC) as additive. The proposed electrode is more selective than other proposed methods for determination of thiocyanate ion over a wide variety of common inorganic and organic anions and it was successfully applied to direct determination of thiocyanate in the presence of other anions in biological, water and waste water samples.","PeriodicalId":8193,"journal":{"name":"Annali di chimica","volume":"97 11-12","pages":"1191-1205"},"PeriodicalIF":0.0,"publicationDate":"2007-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/adic.200790105","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82316557","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Electrochemical Oxidation and Determination of Norepinephrine in the Presence of Ascorbic Acid and Uric Acid at a Poly(Calconcarboxylic Acid)-Modified Electrode 聚钙羧酸修饰电极上抗坏血酸和尿酸存在下去甲肾上腺素的电化学氧化和测定

Annali di chimica Pub Date : 2007-11-20 DOI: 10.1002/adic.200790107

Hong Yao, Yuanyuan Sun, Xinhua Lin, Yuhai Tang, Liying Huang

引用次数: 5

A Modified Glassy Carbon Electrode for Hydrogen Peroxide Sensing 过氧化氢传感用改性玻碳电极

Annali di chimica Pub Date : 2007-11-20 DOI: 10.1002/adic.200790108

Cai-yun Zheng, Shui-hong Chen, Yong-jia Shang, Mao-guo Li

{"title":"A Modified Glassy Carbon Electrode for Hydrogen Peroxide Sensing","authors":"Cai-yun Zheng, Shui-hong Chen, Yong-jia Shang, Mao-guo Li","doi":"10.1002/adic.200790108","DOIUrl":"10.1002/adic.200790108","url":null,"abstract":"In this paper, 4-ferrocenyl benzoic acid (FcBA) was synthesized and the electrochemical behaviors of the synthesized ferrocenyl derivative were studied; Then, the multi-wall carbon nanotubes (MWCNTs) coated FcBA modified glassy carbon (MWCNTs/FcBA/GC) electrode was prepared conveniently and the as-prepared modified electrode was characterized with both electrochemical impedance spectroscopy (EIS) and transmission electron microscopy (TEM). The results suggested that FcBA could coat the MWCNTs tightly in dimethylformamide (DMF) and the coated MWCNTs could be strongly adsorbed on the surface of glass carbon (GC) electrode. The MWCNTs/FcBA/GC electrode exhibited an excellent electrocatalytic activity toward the reduction of hydrogen peroxide. The modifiedelectrode was hence used for the determination of hydrogen peroxide by differential pulse voltammetry (DPV). The linear range of the modified electrode was 2.5×10-6 and 5.0×10-4 mol/l, and the detection limit was estimated to be of 4.8×10-7 mol/l when the signal-to-noise ratio was 3. Further studies indicated that the modified electrode was of a fast response, high sensitivity, good reproducibility, and long-term stability.","PeriodicalId":8193,"journal":{"name":"Annali di chimica","volume":"97 11-12","pages":"1227-1235"},"PeriodicalIF":0.0,"publicationDate":"2007-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/adic.200790108","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85442400","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Measurements of lower Carbonyls and Hydrocarbons at Ny-Alesund, Svalbard 斯瓦尔巴群岛新奥勒松低羰基和碳氢化合物的测量

Annali di chimica Pub Date : 2007-09-04 DOI: 10.1002/adic.200790087

Rosanna Mabilia, Vincenzo Di Palo, Claudio Cassardo, Carla Ciuchini, Antonello Pasini, Massimiliano Possanzini

{"title":"Measurements of lower Carbonyls and Hydrocarbons at Ny-Alesund, Svalbard","authors":"Rosanna Mabilia, Vincenzo Di Palo, Claudio Cassardo, Carla Ciuchini, Antonello Pasini, Massimiliano Possanzini","doi":"10.1002/adic.200790087","DOIUrl":"10.1002/adic.200790087","url":null,"abstract":"Measurements of gaseous organic compounds were carried out near Ny-Alesund, in the Norwegian Arctic, during September 2004. Twenty alkanes, alkenes and aromatic hydrocarbons from ethane to toluene and six aldehydes and ketones from formaldehyde to butanal, were identified and quantified in air samples. Hydrocarbons showed a quite uniform distribution, with ethane being by far the most abundant component (>1 ppb), followed by propane (>0.4 ppb) and butanes (>0.3 ppb), while for unsaturated homologues, except ethene, concentrations never exceeding 0.05 ppb were observed. This distribution confirmed that hydrocarbon depletion during the transport time from Europe into the Arctic was depending upon their atmospheric lifetimes, calculated relatively to the OH reactivity scale. The presence of short lived hydrocarbons could be associated to local sources of anthropogenic and/or biogenic origin. Although the local air photochemistry played a primary role in the production of lower aldehydes in late summer, the observed mixing ratios of formaldehyde (in the 0.25 – 0.50 ppb range) could not be fully explained by known gas-phase chemistry. In this case additional sources, such as fluxes of formaldehyde from snow pack to the atmosphere and/or local anthropogenic activities, were to be taken into consideration. The possible influences of these sources on HCHO mixing ratios were analysed by means of a backward-trajectory circulation model.","PeriodicalId":8193,"journal":{"name":"Annali di chimica","volume":"97 10","pages":"1027-1037"},"PeriodicalIF":0.0,"publicationDate":"2007-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/adic.200790087","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"27186682","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Notices to Authors: Annali di Chimica 10/2007 作者须知:化学年鉴10/2007

Annali di chimica Pub Date : 2007-09-04 DOI: 10.1002/adic.200790098

引用次数: 0

The Effects of Some Operational Parameters in Photodegradation of Benzylamine and Aniline and Their Kinetics in Aqueous Suspension of TiO2 and Pt–Loaded TiO2 部分操作参数对TiO2和pt负载TiO2水悬浮液中苯胺和苯胺光降解动力学的影响

Annali di chimica Pub Date : 2007-09-04 DOI: 10.1002/adic.200790086

Morteza Montazerozohori, Mohammad Hossein Habibi, Shiva Joohari, Vida Khodadostan

{"title":"The Effects of Some Operational Parameters in Photodegradation of Benzylamine and Aniline and Their Kinetics in Aqueous Suspension of TiO2 and Pt–Loaded TiO2","authors":"Morteza Montazerozohori, Mohammad Hossein Habibi, Shiva Joohari, Vida Khodadostan","doi":"10.1002/adic.200790086","DOIUrl":"10.1002/adic.200790086","url":null,"abstract":"Photocatalytic degradation of benzylamine and aniline on TiO2, Pt-modified TiO2, ZnO and ZnS in aqueous solution has been investigated. The degradation of the compounds follows a pseudo-first-order kinetics according to Langmuir-Hinshelwood model. The degradation process of benzylamine and aniline was evaluated by ninhydrin spectrophotometric method using UV-visible spectrophotometer in λmax= 538 and 525 nm, respectively. The results showed the order of Pt/TiO2> TiO2> ZnO> ZnS for photocatalytic activity. In addition increasing of the Pt-loading was found to enhance the degradation rate of the compounds up to the optimal amount of 5wt. % onto the surface of TiO2 so that the rates of degradation were increased about two times. Rate constants for photodegradation of benzylamine and aniline were found to be 1.4×10-3 min-1 and 0.7×10-3 min-1 for TiO2 as photocatalyst, while 2.7×10-3 min-1 and 1.7×10-3min-1 for (5 wt.%) Pt/TiO2 as photocatalyst. Running the reactions in various pH (5-11), indicated that the pH= 8 and 10 or Higher are the optimum pH for photocatalytic degradation of benzylamine and aniline respectively. The effects of some other parameters such as amount of photocatalyst, flux of oxygen and irradiation time were evaluated. Furthermore, the Langmuir-Hinshelwood rate constant kr and adsorption constant KA for the titled compounds are reported.","PeriodicalId":8193,"journal":{"name":"Annali di chimica","volume":"97 10","pages":"1015-1026"},"PeriodicalIF":0.0,"publicationDate":"2007-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/adic.200790086","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"27186681","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 9

Potentiometric Membrane Sensor for the Selective Determination of Pethidine in Pharmaceutical Preparations and Biological Fluids 选择性测定药物制剂和生物液体中哌替啶的电位膜传感器

Annali di chimica Pub Date : 2007-09-04 DOI: 10.1002/adic.200790090

Abdalla Shalaby Prof., Maha El-Tohamy, Magda El-Maamly, Hassan Y. Aboul-Enein Prof.

引用次数: 8

An Investigation on Calcium (II) Oxalate as Solubility and Universal Standard 草酸钙作为溶解度和通用标准的研究

Annali di chimica Pub Date : 2007-09-04 DOI: 10.1002/adic.200790092

Marco Antonilli, Emilio Bottari, Maria Rosa Festa, Lorella Gentile

引用次数: 2