Annali di chimica最新文献

Author Index / Subject Index 2007 作者索引/主题索引2007

Annali di chimica Pub Date : 2007-11-20 DOI: 10.1002/adic.200790115

引用次数: 0

Potentiometric Investigation of Silver (I) Complexation by Arginine 精氨酸络合银的电位学研究

Annali di chimica Pub Date : 2007-11-20 DOI: 10.1002/adic.200790111

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

引用次数: 8

Study of Heavy Metal Speciation in Sediments Impacted with Crude Oil in the Niger Delta, Nigeria 尼日利亚尼日尔三角洲原油影响下沉积物中重金属形态研究

Annali di chimica Pub Date : 2007-11-20 DOI: 10.1002/adic.200790101

Chukwujindu Maxwell Azubuike Iwegbue, Francis Ofurum Arimoro, Sarah Onyenibe Nwozo

引用次数: 13

Catalytic-Kinetic Determination of Silver(I) Using Hexacyanoferrate(II) and 2,4,6-Tripyridyl-1,3,5-Triazine(TPTZ) 六氰铁酸盐(II)和2,4,6-三吡啶-1,3,5-三嗪(TPTZ)催化动力学测定银(I)

Annali di chimica Pub Date : 2007-11-20 DOI: 10.1002/adic.200790106

K.P.P.R. Mohan Reddy, P. Govind Chowdary, V. Krishna Reddy, P. Raveendra Reddy

{"title":"Catalytic-Kinetic Determination of Silver(I) Using Hexacyanoferrate(II) and 2,4,6-Tripyridyl-1,3,5-Triazine(TPTZ)","authors":"K.P.P.R. Mohan Reddy, P. Govind Chowdary, V. Krishna Reddy, P. Raveendra Reddy","doi":"10.1002/adic.200790106","DOIUrl":"10.1002/adic.200790106","url":null,"abstract":"A highly sensitive and selective kinetic spectrophotometric method is proposed for the determination of silver in nanogram quantities. The method is based on catalytic activity of silver(I) in enhancing the green colour formation between potassium ferrocyanide and 2,4,6-tripyridyl-1,3,5-triazine (TPTZ) which is otherwise a very slow reaction at pH 2.0. The absorbance spectrum of the green coloured solution in presence of silver showed two peaks of almost equal intensity one at 405 nm and another at 600 nm. At both the wavelengths the absorbance of the experimental solution increased proportionally with the amount of silver(I) in the range 5 – 410 ng mL-1 and 10 – 610 ng mL-1 respectively. Other experimental conditions like pH, reagent concentration, ferrocyanide concentration and effect of time for obtaining maximum reaction rate were optimized. The molar absorptivity, Sandell's sensitivity, detection limit, determination limit and relative standard deviation (n = 8) were determined as 1.57 × 106 L mol-1 cm-1, 0.065 ng cm-2, 1.6 ng mL-1, 4.8 ng mL-1 and 0.81 % respectively. The effect of various diverse ions on the determination of silver was studied. The method was applied for the determination of silver in alloys, biological samples, effluents, real water and in ayurvedic medicines.","PeriodicalId":8193,"journal":{"name":"Annali di chimica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/adic.200790106","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88156993","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: 6

Characterization of Activated Carbon and Application of Copper Removal from Drinking Water 活性炭的表征及其在饮用水除铜中的应用

Annali di chimica Pub Date : 2007-11-20 DOI: 10.1002/adic.200790114

Yasemen Kutmen Kalpakli, İkbal Koyuncu

引用次数: 0

Editorial: Annali di Chimica 11-12/2007 编辑:《化学年鉴》11-12/2007

Annali di chimica Pub Date : 2007-11-20 DOI: 10.1002/adic.200790117

Francesco De Angelis

引用次数: 0

Contents: Annali di Chimica 11-12/2007 内容：《化学年鉴》 11-12/2007

Annali di chimica Pub Date : 2007-11-20 DOI: 10.1002/adic.200790116

引用次数: 0

PVC Matrix Membrane Sensor for Potentiometric Determination of Triphenyltetrazolium Chloride and Ascorbic Acid PVC基质膜传感器电位法测定氯化三苯四唑和抗坏血酸

Annali di chimica Pub Date : 2007-11-20 DOI: 10.1002/adic.200790110

Gamal Abdel-Hafiz Mostafa

{"title":"PVC Matrix Membrane Sensor for Potentiometric Determination of Triphenyltetrazolium Chloride and Ascorbic Acid","authors":"Gamal Abdel-Hafiz Mostafa","doi":"10.1002/adic.200790110","DOIUrl":"10.1002/adic.200790110","url":null,"abstract":"The construction and performance characteristic of a potentiometric PVC membrane sensor for the determination of triphenyltetrazolium chloride (TPTCl) is described. The sensor is based on the use of triphenyltetrazolium (TPT)-tetraphenylborate (TPB) ion pair as ion exchange sites in PVC matrix in presence of dioctylphathalte as plasticizer. The TPT membrane sensor shows a stable, near-Nernestian response for 6×10-6 - 1×10-2 M TPTCl at 25 °C over the pH range 3-10 with cationic slope of 57.0 ± 0.5. The lower detection limit is 4×0-6M and the response time is 10-30 sec. Selectivity coefficients for TPTCl relative to a number of different cations and anions were investigated, which there is negligible interferences. However, iodide, bromide and thiocyanate were interfering. The determination of 2.0- 3340.0 μg/ml of TPTCl in aqueous solutions shows an average recovery of 98.5 % and a mean relative standard deviation of 1.9 at 160μg/ml. The proposed method has been used for indirect potentiometric determination of ascorbic acid in its pharmaceutical formulations which are comparable favorably with those of British pharmacopoeia method. Precipitation titrations involving TPTCl as titrant are monitored with NaTPB using the proposed membrane sensor; the inflection break is about 300 mV.","PeriodicalId":8193,"journal":{"name":"Annali di chimica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/adic.200790110","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75669831","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

Flotation Separation and Flame Atomic Absorption Spectrometric Determination of Trace Amount of Lead in Some Environmental Samples 浮选分离-火焰原子吸收光谱法测定环境样品中痕量铅

Annali di chimica Pub Date : 2007-11-20 DOI: 10.1002/adic.200790112

Mohammad Saeid Hosseini, Reyhaneh Hassan-ABADI

{"title":"Flotation Separation and Flame Atomic Absorption Spectrometric Determination of Trace Amount of Lead in Some Environmental Samples","authors":"Mohammad Saeid Hosseini, Reyhaneh Hassan-ABADI","doi":"10.1002/adic.200790112","DOIUrl":"10.1002/adic.200790112","url":null,"abstract":"A flotation method based on formation of an ion-associate complex between ferroin and Pb(II)-thiosulfate complex is proposed for the quantitative separation and preconcentration of Pb(II) content in various environmental samples. The flotation process was carried out using a 250-mL aliquot of the aqueous solution at the buffering pH of 8.50 in which the ion-associate complex was floated at the interface of the aqueous/xylene phases. The ion-associate complex was then dissolved in 5 mL of acidic solution of 0.05 M KClO3 and the Pb(II) content was determined by flame atomic absorption spectrometry (FAAS). By this method, a preconcentration factor of 50 can be achieved so that the determination of trace amounts of Pb(II) ions is feasible in the range of 1×10-7 to 1.2×10-6 M. The LOD and RSD (n=7) were obtained as 1.5×10-8 M and 1.5 %, respectively. It was found that a large number of cations and anions even at high considerably foreign ion/Pb(II) ratios were not interfered. In treatment with a SRM water sample and a synthetic liquid extract of vegetable, the recoveries were more than 95 %s, which confirmed validity of the method. The method was satisfactorily applied for determining of trace amount of Pb(II) in some complex matrices.","PeriodicalId":8193,"journal":{"name":"Annali di chimica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/adic.200790112","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73105277","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 Quats in Beverages and Urine Samples by Capillary Zone Eletrophoresis 毛细管带电泳法测定饮料和尿液样品中的钾含量

Annali di chimica Pub Date : 2007-11-20 DOI: 10.1002/adic.200790102

Jatinder Singh Aulakh, Agnes Fekete, Ashok Kumar Malik, Ph. Schmitt-Kopplin, R.K Mahajan

{"title":"Determination of Quats in Beverages and Urine Samples by Capillary Zone Eletrophoresis","authors":"Jatinder Singh Aulakh, Agnes Fekete, Ashok Kumar Malik, Ph. Schmitt-Kopplin, R.K Mahajan","doi":"10.1002/adic.200790102","DOIUrl":"10.1002/adic.200790102","url":null,"abstract":"Conditions have been developed for simultaneous determination of paraquat (PQ) and diquat (DQ) by capillary zone electrophoresis (CZE) with diode array detector (DAD) after their preconcentration by solid phase extraction using Megabond Elut C18 and Strata X 33 μm Polymeric sorbent cartridges. Conditions were optimised with reference to pH, EDTA concentration in sodium acetate acetic acid buffer of pH (3.8) with 3-8 % of methanol, ethanol and acetonitrile as organic modifier in the background electrolyte. UV detection with variable wavelength was used to determine each compound at its maximum absorption providing an excellent sensitivity. The recovery of these compounds from water samples spiked at different levels was more than 90 %. The limit of detection (S/N=3) obtained for milli-Q water when spiked with standards was 0.17 ppm for DQ and 0.19 ppm for PQ, in tap water samples it was found to be 0.27 ppm for DQ and 0.31 ppm for PQ, in cola beverages it was found to be 0.29 ppm for DQ and 0.35 ppm for PQ, and for the urine samples it was 0.36 ppm for diquat and 0.41 ppm for the PQ without preconcentration. After preconcentration using polymeric cartridge the detection limit was reduced to 2.5 ppb for DQand 3 ppb for PQ for the milli-Q water. These detection limits allows for the analysis of these compounds at the levels established by the US Environmental Protection agency.","PeriodicalId":8193,"journal":{"name":"Annali di chimica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/adic.200790102","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80454801","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: 2