Annali di chimica最新文献_第7页

Background Atmospheric Levels of Aldehydes, BTEX and PM10 Pollutants in a Medium-Sized City of Southern Italy 意大利南部一个中型城市大气中醛类、BTEX和PM10污染物的背景水平

Annali di chimica Pub Date : 2007-07-02 DOI: 10.1002/adic.200790045

Pasquale Iovino, Stefano Salvestrini, Sante Capasso

引用次数: 7

Poly (3-(3-Pyridyl) Acrylic Acid) Modified Glassy Carbon Electrode for Simultaneous Determination of Dopamine, Ascorbic Acid and Uric Acid 聚(3-(3-吡啶基)丙烯酸修饰玻碳电极同时测定多巴胺、抗坏血酸和尿酸

Annali di chimica Pub Date : 2007-07-02 DOI: 10.1002/adic.200790051

Yuzhong Zhang, Shao Su, Yan Pan, Liping Zhang, Yuejuan Cai

{"title":"Poly (3-(3-Pyridyl) Acrylic Acid) Modified Glassy Carbon Electrode for Simultaneous Determination of Dopamine, Ascorbic Acid and Uric Acid","authors":"Yuzhong Zhang, Shao Su, Yan Pan, Liping Zhang, Yuejuan Cai","doi":"10.1002/adic.200790051","DOIUrl":"10.1002/adic.200790051","url":null,"abstract":"Trans-3-(3-pyridyl) acrylic acid (PAA) was deposited on glassy carbon electrode (GCE) by electropolymerization in pH 7.0 phosphate buffer solution (PBS). The poly (3-(3-pyridyl) acrylic acid) (PPAA) film modified glassy carbon electrode shows an excellent electrochemical response for dopamine (DA), ascorbic acid (AA) and uric acid (UA). The cyclic voltammetry oxidation peaks for DA and AA, DA and UA, AA and UA are separated by 150 mV, 130 mV and 280 mV, respectively. This permits the simultaneous determination of AA, DA and UA. The interference of AA with the determination of DA could be eliminated because of the electrostatic interaction between DA cations and the negatively charged PPAA film at pH 7.0. The anodic peak currents of DA, AA and UA increase linearly with concentration in the range of 1-40 μmol L-1, 10-400 μmol L-1 and 1.6-80 μmol L-1, respectively, with a correlation coefficient (r) always higher than 0.998. The detection limit is 0.06 μmol L-1, 0.8 μmol L-1 and 1.1 μmol L-1 for DA, AA and UA, respectively.","PeriodicalId":8193,"journal":{"name":"Annali di chimica","volume":"97 8","pages":"665-674"},"PeriodicalIF":0.0,"publicationDate":"2007-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/adic.200790051","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40999704","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: 16

Notices to Authors: Annali di Chimica 8/2007 作者须知:化学年鉴8/2007

Annali di chimica Pub Date : 2007-07-02 DOI: 10.1002/adic.200790063

引用次数: 0

Solid-Phase Extraction and Spectrophotometric Determination of Mercury with 6-Mercaptopurine in Environmental Samples 6-巯基嘌呤固相萃取光度法测定环境样品中的汞

Annali di chimica Pub Date : 2007-07-02 DOI: 10.1002/adic.200790052

Mohammad Saber-Tehrani, Hamid Hashemi-Moghaddam, S. Waqif Husain, Karim Zare

{"title":"Solid-Phase Extraction and Spectrophotometric Determination of Mercury with 6-Mercaptopurine in Environmental Samples","authors":"Mohammad Saber-Tehrani, Hamid Hashemi-Moghaddam, S. Waqif Husain, Karim Zare","doi":"10.1002/adic.200790052","DOIUrl":"10.1002/adic.200790052","url":null,"abstract":"A highly selective, sensitive and rapid method for the determination of trace amounts of inorganic mercury based on the reaction of Hg (II) with 6-mercaptopurine and the solid phase extraction of the complex on C18 membrane disks was developed. The 6-mercaptopurine selectively reacts with Hg (II) to form a complex in the pH range of 5-8. This complex was preconcentrated by solid phase extraction with C18 disks. An enrichment factor of 100 was achieved. The molar absorptivity of the complex is 0.26 ×10-6 L. mol-1. cm-1 measured at 315 nm. The Beer's law is obeyed in the concentration range of 0.002 – 0.048 μg mL-1. The relative standard deviation for eleven-replicated measurement of 0.04 μg mL-1 is 1.5 %. The detection limit is 0.001 μg mL-1 in the water samples. The advantage of the method is that the determination of Hg (II) is free from interference of almost all the cations and anions found in environment and wastewater samples. The determination of Hg (II) in water samples of different origins and marine sediment were carried out by the present method and cold vapor atomic absorption spectrometry (CVAAS). Also the method's accuracy was investigated by using SRM 2709. The obtained results by the present procedure were in good agreement with those of the CVAAS and certified value, so that the applicability of the proposed method was confirmed for the real samples.","PeriodicalId":8193,"journal":{"name":"Annali di chimica","volume":"97 8","pages":"675-683"},"PeriodicalIF":0.0,"publicationDate":"2007-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/adic.200790052","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40998556","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: 3

Simultaneous Spectrophotometric Determination of Phosphate and Silicate by Using Principal Component Artificial Neural Network 主成分人工神经网络同时分光光度法测定磷酸盐和硅酸盐

Annali di chimica Pub Date : 2007-07-02 DOI: 10.1002/adic.200790056

Kobra Zarei, Morteza Atabati, Mehdi Nekoei

引用次数: 3

Speciation of Phytate Ion in Aqueous Solution. Trimethyltin(IV) Interactions in Self Medium† 植酸离子在水溶液中的形态。三甲基锡(IV)在自介质中的相互作用

Annali di chimica Pub Date : 2007-07-02 DOI: 10.1002/adic.200790048

Francesco Crea, Pasquale Crea, Demetrio Milea, Nunziatina Porcino, Silvio Sammartano

{"title":"Speciation of Phytate Ion in Aqueous Solution. Trimethyltin(IV) Interactions in Self Medium†","authors":"Francesco Crea, Pasquale Crea, Demetrio Milea, Nunziatina Porcino, Silvio Sammartano","doi":"10.1002/adic.200790048","DOIUrl":"10.1002/adic.200790048","url":null,"abstract":"In this paper the results of a potentiometric (ISE-[H+] glass electrode) investigation at t = 25 °C on the complexing ability of phytate towards trimethyltin(IV) (tmt) and on the acid-base properties of tmt at high metal concentration (0.050 and 0.075 mol L-1) are reported. First we determined the hydrolytic constants of tmt in aqueous solution without further addition of background salt (self medium); in these experimental conditions we verified the formation of the following hydrolytic species: tmt(OH)0, tmt(OH)2- and the binuclear species (tmt)2(OH)+. Successively, we studied the complex formation constants obtained from the interaction of phytate anion with tmt in the same experimental conditions of hydrolytic measurements; the speciation model obtained takes into account several polynuclear species (tmtH5Phy6-; tmt2H5Phy5-; tmt3H4Phy5-; tmt3H5Phy4-; tmt4H6Phy2-; tmt5HPhy6-). A comparison with literature data is reported too.","PeriodicalId":8193,"journal":{"name":"Annali di chimica","volume":"97 8","pages":"635-645"},"PeriodicalIF":0.0,"publicationDate":"2007-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/adic.200790048","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40999160","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: 8

Analysis of Mural Paintings in Istria 伊斯特拉壁画分析

Annali di chimica Pub Date : 2007-07-02 DOI: 10.1002/adic.200790050

G.A. Mazzocchin, D. Rudello, N. Maraković, I. Marić

引用次数: 4

Papaverine PVC Membrane Ion-Selective Electrodes Based on its Ion-Exchangers with Tetraphenylborate and Tetrathiocyanate Anions 基于四苯基硼酸盐和四硫氰酸盐离子交换剂的罂粟碱PVC膜离子选择电极

Annali di chimica Pub Date : 2007-07-02 DOI: 10.1002/adic.200790060

Mohammed Noor-Eldeen Abbas, Gamal Abdel-Hafiz Mostafa

{"title":"Papaverine PVC Membrane Ion-Selective Electrodes Based on its Ion-Exchangers with Tetraphenylborate and Tetrathiocyanate Anions","authors":"Mohammed Noor-Eldeen Abbas, Gamal Abdel-Hafiz Mostafa","doi":"10.1002/adic.200790060","DOIUrl":"10.1002/adic.200790060","url":null,"abstract":"The construction and general performance of novel potentiometric membrane ion selective electrodes for determination of papaverine hydrochloride has been described. They are based on the formation of the ion association complexes of papaverine (PA) with tetraphenylborate (TPB)(I) or tetrathiocyanate (TTC)(II) counter anions as electro-active material dispersed in a PVC matrix. The electrodes show fast, stable, near Nernstian response for 1×10-2 to 6×10-5 M and 1×10-2 to 1×10-5 M for PA-TPB and PA-TTC respectively at 25 °C over the pH range of 3-5.0 with a cationic slope of ∼ 56.5±0.5 mV/decade for both sensors respectively. The lower detection limit is 4×10-5 and 8×10-6 M for PA- I and PA-II respectively with fast response time ranging from 20-45 sec. Selectivity coefficients for PA relative to a number of interfering substances were investigated. There is a negligible interference from the studied cations, anions, and pharmaceutical excipients. The determination of 4.0-3000.0 μg/ml of PA in aqueous solutions shows an average recovery of 99.1 % and a mean relative standard deviation of 1.4 at 100 μg/ml. The direct determination of PA in some formulations (Vasorin injection) gave results that compare favorably with those obtained using the British Pharmacopoeia method. Potentiometric titration of PA with sodium tetraphenylborate and potassium thiocyanate as titrants utilizing the papaverine electrode as an end point indicator electrode has been carried out.","PeriodicalId":8193,"journal":{"name":"Annali di chimica","volume":"97 8","pages":"771-780"},"PeriodicalIF":0.0,"publicationDate":"2007-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/adic.200790060","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40998434","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: 5

A Model to Predict the Steady-State Concentration of Hydroxyl Radicals in the Surface Layer of Natural Waters 预测天然水体表层羟基自由基稳态浓度的模型

Annali di chimica Pub Date : 2007-07-02 DOI: 10.1002/adic.200790053

Claudio Minero, Vittorio Lauri, Valter Maurino, Ezio Pelizzetti, Davide Vione

引用次数: 12

A Novel Wire-Type Lead-Selective Electrode Based on Bis (1'-Hydroxy-2'-Acetonaphthone)-2,2'-Diiminodiethylamine 基于双(1′-羟基-2′-乙萘酮)-2,2′-二亚氨基二乙胺的新型导线型铅选择电极

Annali di chimica Pub Date : 2007-07-02 DOI: 10.1002/adic.200790058

Zahra Pilehvari, Mohammad Reza Yaftian, Saeed Rayati, Massoumeh Parinejad

{"title":"A Novel Wire-Type Lead-Selective Electrode Based on Bis (1'-Hydroxy-2'-Acetonaphthone)-2,2'-Diiminodiethylamine","authors":"Zahra Pilehvari, Mohammad Reza Yaftian, Saeed Rayati, Massoumeh Parinejad","doi":"10.1002/adic.200790058","DOIUrl":"10.1002/adic.200790058","url":null,"abstract":"The preparation of a lead-selective electrode based on bis(1'-hydroxy-2'-acetonaphthone)-2,2'-diiminodiethylamine (L) as sensing material is reported. The plasticized PVC membrane containing 30% PVC, 67% ortho-nitrophenyloctylether (NPOE) and 3% ionophore L was directly coated on a graphite rod. This electrode exhibits a nearly Nernstian slope of 27.8±0.2 mV decade-1 over a concentration range 10-6−10-2 M with a detection limit of 4.0×10-7 M. The response time of the electrode was found to be <20 s. The potential of the sensor was independent on pH variations in the range 5-7. The selectivity of the electrode towards lead ions over Na+, K+, Ag+, Ca2+, Sr2+, Fe2+, Co2+, Ni2+, Cu2+, Zn2+, Cd2+, La3+, Sm3+ and Er3+ ions was investigated. The prepared electrode was successfully used as an indicator for titration of a lead solution with a standard solution of EDTA. The applicability of the sensor for Pb2+ measurement in various synthetic and real samples has been also demonstrated.","PeriodicalId":8193,"journal":{"name":"Annali di chimica","volume":"97 8","pages":"747-757"},"PeriodicalIF":0.0,"publicationDate":"2007-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/adic.200790058","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40998562","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: 20