Annali di chimica最新文献_第10页

Simultaneous Spectrophotometric Determination of Cobalt and Nickel by Partial Least Square Regression in Micellar Media 偏最小二乘回归在胶束介质中同时分光光度测定钴和镍

Annali di chimica Pub Date : 2007-02-12 DOI: 10.1002/adic.200790008

Varinder Kaur, Ashok Kumar Malik, Neelam Verma

引用次数: 9

Analytical Procedure for the Simultaneous Voltammetric Determination of Trace Metals in Food and Environmental Matrices. Critical Comparison with Atomic Absorption Spectroscopic Measurements 食品和环境基质中痕量金属的同时伏安测定分析方法。原子吸收光谱测量的关键比较

Annali di chimica Pub Date : 2007-02-12 DOI: 10.1002/adic.200790000

Dora Melucci, Giancarlo Torsi, Clinio Locatelli

{"title":"Analytical Procedure for the Simultaneous Voltammetric Determination of Trace Metals in Food and Environmental Matrices. Critical Comparison with Atomic Absorption Spectroscopic Measurements","authors":"Dora Melucci, Giancarlo Torsi, Clinio Locatelli","doi":"10.1002/adic.200790000","DOIUrl":"10.1002/adic.200790000","url":null,"abstract":"An analytical procedure fit for the simultaneous determination of copper (II), chromium(VI), thallium(I), lead(II), tin(II), antimony(III), and zinc(II) by square wave anodic stripping voltammetry (SWASV) in three interdependent environmental matrices involved in foods and food chain as meals, cereal plants and soils is described. The digestion of each matrix was carried out using a concentrated HCl-HNO3-H2SO4 (meals and cereal plants) and HCl-HNO3 (soils) acidic attack mixtures. 0.1 mol/L dibasic ammonium citrate pH 8.5 was employed as the supporting electrolyte. The voltammetric measurements were carried out using, as working electrode, a stationary hanging mercury drop electrode (HMDE) and a platinum electrode and an Ag|AgCl|KClsat electrode as auxiliary and reference electrodes, respectively. The analytical procedure was verified by the analyses of the standard reference materials: Wholemeal BCR-CRM 189, Tomato Leaves NIST-SRM 1573a and Montana Soil Moderately Elevated Traces NIST-SRM 2711. For all the elements in the certified matrix, the precision as repeatability, expressed as relative standard deviation (sr %) was lower than 5 %. The accuracy, expressed as percentage relative error (e %) was of the order of 3-7 %, while the detection limits were in the range 0.015-0.103 μg/g. Once set up on the standard reference materials, the analytical procedure was transferred and applied to commercial meal samples, cereal plants and soils samples drawn in sites devoted to agricultural practice. A critical comparison with spectroscopic measurements is also discussed.","PeriodicalId":8193,"journal":{"name":"Annali di chimica","volume":"97 3-4","pages":"141-151"},"PeriodicalIF":0.0,"publicationDate":"2007-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/adic.200790000","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"27003570","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: 11

Photodegradation of Xenobiotic Compounds Relevant to Estuarine Waters 与河口水域有关的外生化合物的光降解

Annali di chimica Pub Date : 2007-02-12 DOI: 10.1002/adic.200790013

Serge Chiron, Claudio Minero, Davide Vione

引用次数: 10

Contents: Annali di Chimica 3-4/2007 内容：《化学年鉴》3-4/2007

Annali di chimica Pub Date : 2007-02-12 DOI: 10.1002/adic.200790011

引用次数: 0

Morphological and Physiological Responses of Barley Plants Grown on Soils Characterised by Metal Toxicity and Metal Deficiency 大麦在金属中毒和金属缺乏土壤上生长的形态和生理响应

Annali di chimica Pub Date : 2007-02-12 DOI: 10.1002/adic.200790001

Daniela Deriu, Nicoletta Calace, Bianca Maria Petronio, Marco Pietroletti

{"title":"Morphological and Physiological Responses of Barley Plants Grown on Soils Characterised by Metal Toxicity and Metal Deficiency","authors":"Daniela Deriu, Nicoletta Calace, Bianca Maria Petronio, Marco Pietroletti","doi":"10.1002/adic.200790001","DOIUrl":"10.1002/adic.200790001","url":null,"abstract":"Aim of this work was to investigate which are the effects on barley crops grown on two different soils: a soil lacking in Cu, an essential micronutrient (A) and a naturally polluted soil rich in lead, zinc, copper (B). In particular we investigated the relationship between some ecophysiological parameters such as biomass, chlorophyll concentration and guaiacolo peroxidase activity and the chemical-physical properties of the soils like pH, organic matter and heavy metal content. Because metals uptake by plants is strongly correlated with the bioavailable fraction rather then their total amount in a soil, we have measured also metal exchangeable forms, using a single extraction method (MgCl2 as extractant). Plants grown on soil B showed a metal content higher than background limits, whereas plants grown on soil A were characterised by a background Fe and Zn concentrations and by a tolerant Pb concentration. Conversely, Cu content in tissues of plants grown in soil A is found to be under the background limits. Copper-deficiency plants present chlorotic leaves followed by a reduced clorophyll content, while plants grown on metals contaminated soil showed an increase of peroxidase activity.","PeriodicalId":8193,"journal":{"name":"Annali di chimica","volume":"97 3-4","pages":"153-162"},"PeriodicalIF":0.0,"publicationDate":"2007-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/adic.200790001","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"27003502","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

Automated On-Line Preconcentration of Palladium on Different Sorbents and its Determination in Environmental Samples 环境样品中钯在不同吸附剂上的自动在线富集及其测定

Annali di chimica Pub Date : 2007-02-12 DOI: 10.1002/adic.200790010

Fuensanta Sánchez Rojas, Catalina Bosch Ojeda, José Manuel Cano Pavón

引用次数: 4

Potentiometric Batch and Flow Injection Analysis of Betaine Hydrochloride 盐酸甜菜碱的间歇和流动注射电位分析

Annali di chimica Pub Date : 2007-02-12 DOI: 10.1002/adic.200790006

Sayed S. Badawy, Ahmed F. A. Youssef, Ali A. Mutair

{"title":"Potentiometric Batch and Flow Injection Analysis of Betaine Hydrochloride","authors":"Sayed S. Badawy, Ahmed F. A. Youssef, Ali A. Mutair","doi":"10.1002/adic.200790006","DOIUrl":"10.1002/adic.200790006","url":null,"abstract":"Novel PVC membrane electrodes for the determination of betaine ion based on the formation of betaine-tetraphenylborate (Be-TPB) and betaine-phosphotungstate (Be-PT) ion-exchangers as electroactive materials are described. The sensors show a fast, stable, near Nernstian response for 6.92 × 10-6 to 7.94 × 10-3 M and 1.0 × 10-4 to 1.0 × 10-2 M betaine hydrochloride (Be.Cl) in case of Be-TPB electrode applying batch and flow injection analysis (FIA), respectively, and 2.95 × 10-5 to 2.26 × 10-3 M and 3.16 × 10-5 to 1.0 × 10-2 M in case of Be-PT electrode for batch and FIA electrodes, respectively, at 25 °C over the pH range of 3.5-10 with a cationic slope of 60.2 and 59.1 mV decade-1 and a fast potential response of ≤ 15 s. The lower detection limits are 7.94 × 10-6 and 3.18 × 10-5 M Be.Cl for Be-TPB and Be-PT electrodes, respectively. Selectivity coefficient data for some common inorganic cations, sugars, amino acids and the components other than betaine, of the mixed drug investigated show negligible interference. The electrodes have been applied to the direct potentiometric determination of betaine hydrochloride in water and in a pharmaceutical preparation under batch and FIA conditions. Potentiometric titrations of Be.Cl with NaTPB and PTA as titrants were monitored with the developed betaine electrodes as an end point indicator electrode. The determination of Be.Cl shows an average recovery of 100.8 % with mean relative standard deviation of 0.61 %. The effect of temperature on the electrodes was also studied.","PeriodicalId":8193,"journal":{"name":"Annali di chimica","volume":"97 3-4","pages":"213-225"},"PeriodicalIF":0.0,"publicationDate":"2007-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/adic.200790006","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"27005730","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: 0

Notices to Authors: Annali di Chimica 3-4/2007 作者须知:《化学年鉴》2007年4月3日

Annali di chimica Pub Date : 2007-02-12 DOI: 10.1002/adic.200790012

引用次数: 0

Dioxouranium(VI)-Carboxylate Complexes. Speciation of UO22+-1,2,3-Propanetricarboxylate System in NaClaq at Different Ionic Strengths and at T = 25 °C Dioxouranium (VI)羧酸盐复合物。不同离子强度下UO22+-1,2,3-丙基羧酸盐体系在NaClaq中的形态

Annali di chimica Pub Date : 2007-02-12 DOI: 10.1002/adic.200790002

Francesco Crea, Concetta de Stefano, Demetrio Milea, Silvio Sammartano

{"title":"Dioxouranium(VI)-Carboxylate Complexes. Speciation of UO22+-1,2,3-Propanetricarboxylate System in NaClaq at Different Ionic Strengths and at T = 25 °C","authors":"Francesco Crea, Concetta de Stefano, Demetrio Milea, Silvio Sammartano","doi":"10.1002/adic.200790002","DOIUrl":"10.1002/adic.200790002","url":null,"abstract":"The formation constants of dioxouranium(VI) - 1,2,3-propanetricarboxylate [tricarballylate (3-), TCA] complexes were determined in NaCl aqueous solutions at 0 ≤ I / mol L-1 ≤ 1.0 and t = 25 °C, by potentiometry, ISE-[H+] glass electrode. The speciation model obtained at each ionic strength includes the following species: ML-, MLH0, ML24- and ML2H3- (M = UO22+ and L = TCA). The dependence on ionic strength of protonation constants of 1,2,3-propanetricarboxylate and of the metal-ligand complexes was modeled by the SIT (Specific ion Interaction Theory) approach and by the Pitzer equations. The formation constants at infinite dilution are [for the generic equilibrium p UO22+ + q (L3-) + r H+ = (UO22+)p(L)qHr(2p−3q+r); βpqr]: log β110 = 6.222±0.030, log β111 = 11.251±0.009, log β121 = 7.75±0.02, log β121 = 14.33±0.06. The sequestering ability of 1,2,3-propanetricarboxylate towards UOUO22+ was quantified by using a sigmoid Boltzman type equation.","PeriodicalId":8193,"journal":{"name":"Annali di chimica","volume":"97 3-4","pages":"163-175"},"PeriodicalIF":0.0,"publicationDate":"2007-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/adic.200790002","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"27003573","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

Determination of Cobalt at ng ml-1 Level in Water Using the Electrophilic Substiution Complexation between Co(II) and Chlorophosphonazo- p-Cl-Cu(II) Complex 用Co(II)和氯磷偶氮- p-Cl-Cu(II)配合物之间的亲电取代络合测定水中ng ml-1水平的钴

Annali di chimica Pub Date : 2007-02-12 DOI: 10.1002/adic.200790009

Xue-Tao Zhao, He-Ping Zhao, Yi-Quan Le, Teng Zeng, Hong-Wen Gao

引用次数: 4