Journal of Chromatography & Separation Techniques最新文献_第9页

Detection and Quantification of Inorganic and Organic Anions in Natural, Potable, and Wastewaters in Northern New York Using Capillary Zone Electrophoresis and Indirect UV Detection. 用毛细管区带电泳和间接紫外检测法检测和定量纽约北部天然、饮用水和废水中的无机和有机阴离子。

Journal of Chromatography & Separation Techniques Pub Date : 2017-04-01 Epub Date: 2017-05-30 DOI: 10.4172/2157-7064.1000361

Lara Varden, Britannia Smith, Fadi Bou-Abdallah

{"title":"Detection and Quantification of Inorganic and Organic Anions in Natural, Potable, and Wastewaters in Northern New York Using Capillary Zone Electrophoresis and Indirect UV Detection.","authors":"Lara Varden, Britannia Smith, Fadi Bou-Abdallah","doi":"10.4172/2157-7064.1000361","DOIUrl":"https://doi.org/10.4172/2157-7064.1000361","url":null,"abstract":"<p><p>Capillary zone electrophoresis (CZE) is a sensitive and rapid technique used for determining traces of inorganic and organic anions in potable, natural, and wastewaters. Here, CZE with indirect UV-diode array detection (CZE-DAD) was employed with a background electrolyte system comprising of an Agilent Technologies proprietary basic anion buffer at pH 12.0 and a forensic anion detection method. The limits of detection (LOD) for this method ranged between 3 and 5 ppm and involved hydrodynamic injection of 50 mbar for 6 s with a negative polarity separation voltage of -30 kV at 30°C, a detection wavelength of 350 nm and indirect reference of 275 nm. Fourteen different anions were checked for in the water samples that were examined and included bromide, chloride, thiosulfate, nitrate, nitrite, sulfate, azide, carbonate, fluoride, arsenate, phosphate, acetate, lactate, and silicate. The water samples were collected from Northern New York towns and the Raquette River water system, the third longest river in New York State and the largest watershed of the central and western Adirondacks. The concentrations detected for these anions ranged from <5.0 ppm to 260 ppm.</p>","PeriodicalId":15534,"journal":{"name":"Journal of Chromatography & Separation Techniques","volume":"8 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.4172/2157-7064.1000361","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"35630518","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Comments on Chemical Analysis of Limestone and Dolomite UsingCapillary Electrophoresis 毛细管电泳法分析石灰石和白云石化学研究进展

Journal of Chromatography & Separation Techniques Pub Date : 2017-03-20 DOI: 10.4172/2157-7064.1000359

Rathore Dps

引用次数: 0

Development and Validation of High Performance Thin LayerChromatography for Determination of Esomeprazole Magnesium inHuman Plasma 高效薄层色谱法测定埃索美拉唑镁非人血浆的建立与验证

Journal of Chromatography & Separation Techniques Pub Date : 2017-03-20 DOI: 10.4172/2157-7064.1000360

Gosavi Sm, T. Ma

引用次数: 1

Development and Application of Liquid Chromatography in Life Sciences 液相色谱在生命科学中的发展与应用

Journal of Chromatography & Separation Techniques Pub Date : 2017-03-17 DOI: 10.4172/2157-7064.1000358

B. Zhu, Ying Chen

引用次数: 8

Comments on: Simultaneous Separation and Preconcentration of RareEarth Elements on Activated Carbon for its Determination by ICP-OES inBeneficiation Products 在活性炭上同时分离和富集稀土元素，并用ICP-OES法测定选矿产品中的稀土元素

Journal of Chromatography & Separation Techniques Pub Date : 2017-03-16 DOI: 10.4172/2157-7064.1000357

Rathore Dps

{"title":"Comments on: Simultaneous Separation and Preconcentration of RareEarth Elements on Activated Carbon for its Determination by ICP-OES inBeneficiation Products","authors":"Rathore Dps","doi":"10.4172/2157-7064.1000357","DOIUrl":"https://doi.org/10.4172/2157-7064.1000357","url":null,"abstract":"Comments on simultaneous separation and preconcentration of rare earth elements on activated carbon/charcoal for its determination by ICP-OES in beneficiation products and different geological matrices has been presented. The manuscript published on benefication products is lacking in any innovation, originality or novelty over the earlier published paper titled “Determination of Rare earth elements in different geological matrices by ICP-AES after solid phase micro extraction on activated charcoal” by Murty, Mohanta and Radhamani published in the journal, Atomic Spectroscopy. There is a repetition of the “The unique feature of the method’ in the above cited manuscript and also in his earlier publication titled “A single stage simultaneous separation and preconcentration of rare earth elements on activated carbon for its determination by ICP-OES after wet ashing–application to soil samples by Chakrapani, Mahanta, Hanuman, Srivastava published in the journal “Exploration and Research for Atomic Minerals on bromoheavies. Moreover, there are contradictory and misleading statements /findings on the role of AC as adsorbent, amount of AC and desorption of REEs from AC in the published papers by Chakrapani et al. [1] and other authors from AMD laboratories. The findings have previously published elsewhere without proper cross referencing /justification in manuscripts. The desorption of REEs from AC simply by treating AC with 3.2 M HNO3 is the best analytical protocol, thus avoiding the tedious and time consuming operation of ashing AC. Moreover, regenerated AC can be re-used for further experiments. Dry-ashing of the charcoal pellet is the alternate option and can be completed in 1 hr. Wet-ashing of charcoal pellet with HNO3 and HClO4 involves toxic acids fuming, is a health hazard and may lead to serious explosions. Separation of rare earth metals through biosorption using low cost biomaterials or modified AC will continue to remain a greatest challenge.","PeriodicalId":15534,"journal":{"name":"Journal of Chromatography & Separation Techniques","volume":"4 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2017-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76027919","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

Development of a Method for Regioisomer Impurity Detection andQuantitation within the Raw Material 3-Chloro-5-Fluorophenol by GasChromatography 原料3-氯-5-氟苯酚中区域异构体杂质气相色谱检测与定量方法的建立

Journal of Chromatography & Separation Techniques Pub Date : 2017-03-10 DOI: 10.4172/2157-7064.1000356

J. R. Denton, Yun Chen, T. Loughlin

引用次数: 2

Some Trends in Modern Analytical Chemistry 现代分析化学的一些发展趋势

Journal of Chromatography & Separation Techniques Pub Date : 2017-03-02 DOI: 10.4172/2157-7064.1000355

Y. Zolotov

引用次数: 6

A Simple and Fast Solid-Phase Extraction GC-ECD Method for the RoutineAssessment of Atrazine Residues in Agricultural Produces 快速固相萃取-气相色谱- ecd法测定农产品中莠去津残留量

Journal of Chromatography & Separation Techniques Pub Date : 2017-02-27 DOI: 10.4172/2157-7064.1000353

D. Sharma, Anil Kumar, Mahender

{"title":"A Simple and Fast Solid-Phase Extraction GC-ECD Method for the RoutineAssessment of Atrazine Residues in Agricultural Produces","authors":"D. Sharma, Anil Kumar, Mahender","doi":"10.4172/2157-7064.1000353","DOIUrl":"https://doi.org/10.4172/2157-7064.1000353","url":null,"abstract":"A simple and rapid solid-phase extraction (SPE) supported Gas Chromatographic-Electron Capture Detection (GC-ECD) method has been presented for the routine determination of atrazine in some common agricultural produces. Equivalent to USP G-42 GC stationary phase, DB-35 ms capillary column and ECD detector was selected on the basis of physical and structural characteristics of atrazine. Temperature programming of 20 minutes with 0.8 mL/min optimized gas flow gave maximum number of the theoretical plates (N=104) and high resolution (Rs~2.1 min) with LOD and LOQ values of 0.001 μg/L and 0.1 μg/L respectively. LOQ achieved by the present method is almost below the maximum residue levels recommended by the European legislation. Satisfactory spiked recoveries of the atrazine were obtained from agricultural produces ranging from 82.2 to 97.8% with relative standard deviations below 3.8%. The minimum consumption of solvent (5 mL ethyl acetate) in SPE for residual workup in 5 minutes, with subsequent 20 minutes GC analysis makes the proposed method simple and fast having promise as an excellent economical alternative for the routine analysis of atrazine in environmental samples.","PeriodicalId":15534,"journal":{"name":"Journal of Chromatography & Separation Techniques","volume":"50 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2017-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84898354","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

Direct Determination of N-Nitrosodiethanolamine (NDELA) inEthanolamines by LC-MS-MS LC-MS-MS直接测定n -亚硝基二乙醇胺(NDELA)乙醇胺

Journal of Chromatography & Separation Techniques Pub Date : 2017-02-27 DOI: 10.4172/2157-7064.1000354

G. Kuriakose, Raghun, Anand Ks, S. Al-Shahrani

引用次数: 1

Detection of Growth Hormone Releasing Peptides in Serum by aCompetitive Receptor Binding Assay 竞争受体结合法检测血清中生长激素释放肽

Journal of Chromatography & Separation Techniques Pub Date : 2017-02-21 DOI: 10.4172/2157-7064.1000351

P. Ferro, G. Krotov, I. Zvereva, Pérez Mana, Mateus Ja, J. Segura

{"title":"Detection of Growth Hormone Releasing Peptides in Serum by aCompetitive Receptor Binding Assay","authors":"P. Ferro, G. Krotov, I. Zvereva, Pérez Mana, Mateus Ja, J. Segura","doi":"10.4172/2157-7064.1000351","DOIUrl":"https://doi.org/10.4172/2157-7064.1000351","url":null,"abstract":"The use of small peptides for medical purposes has gained great importance in the last decade. Among these molecules are the growth hormone releasing peptides (GHRPs). These substances are highly sought by cheating athletes because of their ergogenic effects. Thus, GHRPs are listed in the World Antidoping Agency Prohibited List and several methods have been developed for their detection in urine samples. Serum is another useful matrix frequently used for anti-doping control. An experimental adaptation of a competitive methodology for GHRPs wide-group detection, previously developed for urine, is reported here using a serum matrix instead. The modifications have been mainly addressed the need to remove endogenous ghrelin (always present in serum) to avoid interference in the competitive binding assay. The modified test was first evaluated using serum spiked with different pure GHRPs (i.e., GHRP-2, GHRP-6 and Hexarelin), then using serum samples from pilot studies in which healthy subjects were treated intravenously with GHRP-2 and intranasally with GHRP-2 and GHRP-6. The results showed the reliability of the modified methodology for the detection of GHRPs in a serum matrix.","PeriodicalId":15534,"journal":{"name":"Journal of Chromatography & Separation Techniques","volume":"79 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2017-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86565394","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