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Author : Susan Elizabeth Hill
Publisher :
ISBN 13 :
Total Pages : 134 pages
Book Rating : 4.:/5 (378 download)
Download or read book New Ion Chromatographic Methods for Determination of Trace Levels of Cyanide written by Susan Elizabeth Hill and published by . This book was released on 1997 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Christel Pohlandt-Watson
Publisher :
ISBN 13 : 9780869997741
Total Pages : 3 pages
Book Rating : 4.9/5 (977 download)
Download or read book A Revised Ion-chromatographic Method for the Determination of Free Cyanide written by Christel Pohlandt-Watson and published by . This book was released on 1986 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : TW. Dolzine
Publisher :
ISBN 13 :
Total Pages : 11 pages
Book Rating : 4.:/5 (125 download)
Download or read book Determination of Hydrogen Cyanide in Air by Ion Chromatography written by TW. Dolzine and published by . This book was released on 1982 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper describes a new procedure for the determination of hydrogen cyanide (HCN) concentrations in air. Airborne HCN is entrained in an impinger containing aqueous alkali and subsequently converted to sodium formate; the latter is quantitatively measured by ion chromatography. The collection procedure, reaction conditions, and chromatographic method are described. Interferences and the use of ion exchange resins for sample clean-up were investigated also. The precision and accuracy of spiked and air samples are presented.
Author : Christel Pohlandt
Publisher :
ISBN 13 :
Total Pages : 11 pages
Book Rating : 4.:/5 (46 download)
Download or read book The Separation, by Ion-interaction Chromatography, of Metal Cyanide Complexes, and the Application of the Technique to the Determination of 'total' Cyanide written by Christel Pohlandt and published by . This book was released on 1989 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Christel Pohlandt-Watson
Publisher :
ISBN 13 : 9780869996478
Total Pages : 31 pages
Book Rating : 4.9/5 (964 download)
Download or read book The Determination of Cyanide in Hydrometallurgical Process Solutions and Effluents by Ion Chromatography written by Christel Pohlandt-Watson and published by . This book was released on 1984 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Chromatographic Separation and Determination of Stable Metal Cyanide Complexes in Gold Processing Solutions written by and published by . This book was released on 1986 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Classical analytical chemistry relied to a large extent on the physical separation of the individual elements or radicals prior to their identification and quantitative determination. With the advent of instrumental methods of analysis it became possible in many instances to detect and measure the concentration of elements by physical means without prior separation. Optical emission spectrometry, X-ray-fluorescence spectrometry, polarography, and activation analysis are examples of such techniques. In recent years, much effort has been directed towards 'speciation': the identification of the state of combination of the elements and their complexes as they exist in a sample, followed by quantitative estimation. This is of importance, for example, in the electroplating, electrowinning, water-treatment, and hydrometallurgical fields. Ion chromatography is a technique that can be used with success for some of this work. Chromatography as a method of separating species was first employed in 1906 by the botanist Tswett to separate plant pigments. The early chromatographic columns consisted of inorganic adsorbents such as alumina. Paper pulp was also used, to be followed by synthetic organic ion-exchange materials for chemical chromatographic separations. By the suitable choice of solvents and eluting agents, it has now become possible to separate certain chemical complexes with relative ease. It then remains to find a suitable method for the determination of the eluted species. Spectrophotometric or conductivity measurements are usually employed. The technique has been developed to such an extent that it can be used for small volumes of samples. The procedure has great potential in the South African mining context, not only for the better understanding and control of hydrometallurgical processes, but also for the analysis and monitoring of effluents. Pioneering work has been done at Mintek on the development and application of this technique in South Africa. Already several laboratories serving the mining industry have acquired similar equipment, and ion chromatography is becoming one of the accepted analytical procedures. Work on the determination of complexes other than cyanides is already in progress.
Download or read book The Determination of 'total' Cyanide by the Ion-interaction Chromatographic Separation of Individual Metal Cyanide Complexes written by and published by . This book was released on 1988 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A method is described for the determination of a variety of metal cyanide complexes occurring typically in solutions and effluents derived from the processing of gold. The method employs reverse-phase ion-interaction chromatography using an acetonitrile eluent containing tetrabutylammonium hydroxide as the pairing reagent and a neutral phosphate buffer as the inorganic modifier. Individual metal complexes occurring in a process or tailings solution can be identified, and their cyanide content reliably estimated. The simultaneous determination of 'free' cyanide in waste waters, which allows the 'total' cyanide concentration to be estimated, is achieved by the conversion of the cyanide to the silver cyanide complex, followed by chromatographic separation. The precision of the procedure (relative standard deviation) for most of the complexes is acceptable, even at submicrogram-per-litre levels.
Author : Satinder Ahuja
Publisher : Elsevier
ISBN 13 : 0080455182
Total Pages : 679 pages
Book Rating : 4.0/5 (84 download)
Download or read book Handbook of Pharmaceutical Analysis by HPLC written by Satinder Ahuja and published by Elsevier. This book was released on 2005-02-09 with total page 679 pages. Available in PDF, EPUB and Kindle. Book excerpt: High pressure liquid chromatography–frequently called high performance liquid chromatography (HPLC or, LC) is the premier analytical technique in pharmaceutical analysis and is predominantly used in the pharmaceutical industry. Written by selected experts in their respective fields, the Handbook of Pharmaceutical Analysis by HPLC Volume 6, provides a complete yet concise reference guide for utilizing the versatility of HPLC in drug development and quality control. Highlighting novel approaches in HPLC and the latest developments in hyphenated techniques, the book captures the essence of major pharmaceutical applications (assays, stability testing, impurity testing, dissolution testing, cleaning validation, high-throughput screening). A complete reference guide to HPLC Describes best practices in HPLC and offers 'tricks of the trade' in HPLC operation and method development Reviews key HPLC pharmaceutical applications and highlights currents trends in HPLC ancillary techniques, sample preparations, and data handling
Author : Robert E. Smith
Publisher : CRC Press
ISBN 13 : 9780849349676
Total Pages : 216 pages
Book Rating : 4.3/5 (496 download)
Download or read book Ion Chromatography Applications written by Robert E. Smith and published by CRC Press. This book was released on 1987-12-31 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: Describes recent advances in ion chromatography and demonstrates how it is used to solve scientific and industrial problems. The basic principles of ion chromatography are explained, including gradient elution of ions and micromembrane suppressors. The various anion and cation exchange columns together with various detection methods and applications of ion chromatography in the environmental and life sciences and industry are reviewed. Over 100 chromatograms which illustrate parameters needed to perform analysis and data on gradient and mobile phase ion chromatography are included.
Author :
Publisher :
ISBN 13 :
Total Pages : 1092 pages
Book Rating : 4.:/5 (3 download)
Download or read book Journal of Research of the National Bureau of Standards written by and published by . This book was released on 1988 with total page 1092 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : National Research Council
Publisher : National Academies Press
ISBN 13 : 0309182700
Total Pages : 292 pages
Book Rating : 4.3/5 (91 download)
Download or read book Acute Exposure Guideline Levels for Selected Airborne Chemicals written by National Research Council and published by National Academies Press. This book was released on 2002-10-07 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book reviews toxicity documents on five chemicals that can be released in the air from accidents at chemical plants, storage sites, or during transportation. The documents were prepared by the National Advisory Committee on Acute Exposure Guideline Levels for Hazardous Substances and were evaluated for their scientific validity, comprehensives, internal consistency, and conformance to the 1993 guidelines report.
Author : Hongzhu Liao
Publisher :
ISBN 13 :
Total Pages : 189 pages
Book Rating : 4.:/5 (945 download)
Download or read book New Conductometric Detection Methods for Sensitive Ion Chromatographic Measurement of Weak Electrolytes written by Hongzhu Liao and published by . This book was released on 2016 with total page 189 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since Suppressed conductometric anion chromatography (SCAC) was proposed in the mid-1970s, SCAC has become a widely used tool for the determination of anion species in aqueous samples. Its application ranges from trace analysis in semiconductor manufacture to pharmaceutical analysis. This dissertation primarily focuses on three different projects on the conductometric determination of weak acids. Other work carried out during the same period both involved SCAC for the determination of anion composition of açaí Extracts and on the unusual ion exchange behavior of myoinositol phosphates. SCAC responds poorly and nonlinearly to weak acids, because they only ionize partially and the degree of ionization change as a function of pKa and concentration. Various efforts to improve conductometric detection of weak acids have been proposed. The best results have come from the introduction from a small constant amount of base after the suppressed conductometric detection (D1). The acid form of analyte HA can react with the equivalent base solution to produce the corresponding salt and the conductivity is measured again (D2). This second signal arises from the difference of the conductance of A- and OH- as the overall process is HA + OH- __ A- +H2O. The use of a readily available commercial ICS-5000 IC system that contains two independently operable ion chromatographs provided facile implementation of such a scheme. SCAC was carried out in the analytical channel to separate different anions. After D1, LiOH generated by a capillary scale electrodialytic generator was introduced into the main stream by different mixers designed and built in-house, including a back-flow tee mixer (BT), an end-blocked membrane tee mixer (EMT), and a tubular membrane mixer (TM). Based on its mixing efficiency and small dispersion, the BT design was found to be the best to perform sensitive determination of weak acids at D2. Using the same principle of reacting HA with OH-, a volatile analyte transfer device (VATD) of annular tubular design was fabricated to assist the transfer and enrichment of volatile weak acids. Volatile weak acids can transfer across a gas permeable membrane from the outer annular channel of VATD to the central channel. As this scheme is dilutionless and does not involve mixing of two liquids, the baseline noise at D2 reduced >/=100x, compared with previous efforts, resulting in a proportionate improvement in the limits of detection. The VATD is a robust low-noise device providing highly sensitive conductometric detection of volatile weak acids like sulfide and cyanide. The third project provided complementarity to the second one. Because the majority of weak acids are not volatile, this time a permeative amine introduction device (PAID) was used to introduce a volatile base into the effluent weak acid stream. Diethylamine was chosen as the amine source due to its low pKb value (3.0) and high vapor pressure. The eluites were thus detected against a low diethylammonium hydroxide background (5-31 S/cm) as negative peaks. The PAID as described here is a robust low-noise design to allow sensitive conductometric detection of weak acids.
Author : J.P. Waterworth
Publisher :
ISBN 13 :
Total Pages : 236 pages
Book Rating : 4.:/5 (729 download)
Download or read book Validation of Ion Chromatographic Methods for the Trace Analysis of Ions in Pharmacopoeial Grades of Water written by J.P. Waterworth and published by . This book was released on 1995 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Rajmund Michalski
Publisher : John Wiley & Sons
ISBN 13 : 1119085489
Total Pages : 286 pages
Book Rating : 4.1/5 (19 download)
Download or read book Application of IC-MS and IC-ICP-MS in Environmental Research written by Rajmund Michalski and published by John Wiley & Sons. This book was released on 2016-05-20 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introduces the reader to the field of ion chromatography, species analysis and hyphenated methods IC-MS and IC-ICP-MS including the theory and theirs applications Covers the importance of species analysis and hyphenated methods in ion chromatography Includes practical applications of IC-MS and IC-ICP-MS in environmental analysis Details sample preparation methods for ion chromatography Discusses hyphenated methods IC-MS and IC-ICP-MS used in determining both the total element contents and its elements Details speciation analysis used in studying biochemical cycles of selected chemical compounds; determining toxicity and ecotoxicity of elements; food and pharmaceuticals quality control; and in technological process control and clinical analytics
Author : Christel Pohlandt
Publisher :
ISBN 13 :
Total Pages : 11 pages
Book Rating : 4.:/5 (46 download)
Download or read book The Separation, by Ion-interaction Chromatography, of Metal Cyanide Complexes, and the Application of the Technique to the Determination of 'total' Cyanide written by Christel Pohlandt and published by . This book was released on 1989 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: The determination of a variety of metal complexes, typically occurring in solutions and effluents derived from the processing of gold, is described. The method makes use of reverse-phase ion-interaction chromatography, with an acetonitrile eluent containing tetrabutylammonium hydroxide as the pairing reagent and a neutral phosphate buffer as the inorganic modifier. Individual metal complexes occurring in a process or tailings solution can be identified and their cyanide content reliably estimated. The simultaneous determination of 'free' cyanide in waste waters, which allows an estimate of the 'total' cyanide concentration, was achieved by the conversion of the cyanide to the silver cyanide complex, chromatographic separation, and the use of calibration graphs.
Author : Edward Joseph Conway
Publisher :
ISBN 13 :
Total Pages : 488 pages
Book Rating : 4.3/5 (91 download)
Download or read book Microdiffusion Analysis and Volumetric Error written by Edward Joseph Conway and published by . This book was released on 1963 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt: CONTENTS - I. INTRODUCTORY - PART I - APPARATUS AND PRINCIPLES USED IN MICRODIFFUSION ANALYSIS - II. A STANDARD MICRO DIFFUSION APPARATUS OR 'UNIT' - III. FACTORS INFLUENCING THE ABSORPTION RATE FROM OUTER TO INNER CHAMBER WITH SPECIAL REFERENCE TO AMMONIA - IV. GENERAL PRINCIPLES GOVERNING THE ABSORPTION TIME IN MICRO DIFFUSION ANALYSIS - V. PIPETTES (SUITABLE FOR USE WITH THE STANDARD UNITS) AND THEIR DELIVERY ERRORS - VI. MICRO-BURETTES (SUITABLE FOR USE WITH THE STANDARD UNITS) AND ERRORS INVOLVED IN THEIR USE - VII. THE MICRODIFFUSION METHOD WITH END-POINT VOLUMES AROUND 20 CUBIC MILLIMETRES - VII. COLORIMETRY IN THE MICRODIFFUSION METHODS - PART II - DESCRIPTION OF METHODS WITH THE STANDARD UNITS - A. VOLATILE BASES - Aa. Ammonia Group - IX. AMMONIA. GENERAL METHOD USING STANDARD ACID AS ABSORBENT - X. AMMONIA. GENERAL METHOD (USING THE BORIC-HCL PROCEDURE) - XI. SPECIAL FACTORS INFLUENCING THE RATE OF AMMONIA ABSORPTION - XII. OTHER METHODS FOR DETERMINING THE ABSORBED AMMONIA IN THE MICRO DIFFUSION PROCEDURE - XIII. AMMONIA. BIOLOGICAL DETERMINATIONS - XIV. TOTAL NITROGEN (OVER 100 µg N). - XV. TOTAL NITROGEN (UNDER 100 µg N) FURTHER PROCEDURE - XVI. TOTAL NITROGEN (1 TO 0·1 µg N) - XVII. UREA (BLOOD AND URINE) - XVIII. UREA IN TISSUES - XIX. ADENOSINETRIPHOSPHORIC ACID, ADENYLIC ACID, ADENOSINE, ETC. - XX. NITRATE, NITRITE AND AMIDE NITROGEN - XXI. AMIDES (continued). GLUTAMINE - XXII. MONOAMINE OXIDASE AND HISTAMINASE IN TISSUES - Ab. Amine Group - XXIII. DETERMINATION OF VOLATILE AMINES - B. VOLATILE ACIDS - Ba. The Carbon Dioxide Group - XXIV. CARBONATES AND BICARBONATE - XXV. BLOOD GLUCOSE AND FERMENTABLE SUGAR IN NORMAL URINE - XXVI. DETERMINATION OF CARBONIC ANHYDRASE - XXVII. OXIDATION RATES OF ORGANIC SUBSTANCES WITH A STANDARD OXIDANT WITH APPLICATION TO DETERMINATION OF MINUTE AMOUNTS OF CALCIUM AS OXALATE - Bb. 1 Volatile Fatty Acids - XXVIII. ACETIC ACID AND OTHER LOWER FATTY ACIDS - XXIX. ASSAY OF ACETYLCHOLINESTERASE - Bc. Volatile Weak Inorganic Acids and Phenols - XXX. CYANIDE, AZIDE, SULPHIDE, PHENOLS - C. VOLATILE ALCOHOLS - XXXI. METHANOL AND ISOPROPANOL GROUP - XXXII. ETHANOL - XXXIII. ETHANOL FROM URETHANE - D. VOLATILE ALDEHYDES - Da. Formaldehyde Group XXXIV. FORMALDEHYDE - XXXV. FORMALDEHYDOGENIC STEROIDS (PERIODIC ACID AS OXIDANT) - XXXVI. FORMALDEHYDOGENIC STEROIDS (SODIUM BISMUTHATE AS OXIDANT) - XXXVII. GLYCINE (FORMALDEHYDE PRODUCED BY NINHYDRIN OXIDATION) - Db. Acetaldehyde Group XXXVIII. ACETALDEHYDE (SEMICARBAZIDE ABSORPTION) - XXXIX. ACETALDEHYDE FROM LACTIC ACID AND THREONINE WITH BISULPHITE ABSORPTION - E. VOLATILE KETONES - XL. ACETONE (INCLUDING A RAPID CLINICAL METHOD USING THE NESSLER SOLUTION) - F. VARIOUS VOLATILE OXIDISING AND REDUCING SUBSTANCES - Fa. The Halogens - XLI. THE HALOGENS (INTRODUCTORY) - XLII. CHLORIDE (BY OXIDATION TO CHLORINE AND ABSORPTION INTO IODIDE) - XLIII. CHLORIDE (BY OXIDATION TO CHLORINE AND ABSORPTION INTO FAST GREEN) - XLIV. BROMIDE - XLV. IODIDES AND HALOGEN MIXTURES - XLVI. SERIAL DETERMINATION OF ORGANICALLY BOUND HALOGEN - XLVII. VOLATILE HALOGENATED HYDROCARBONS (CHLOROFORM, TRICHLORETHYLENE AND CARBON TETRACHLORIDE) - Fb. Carbon Monoxide - XLVIII. CARBON MONOXIDE - XLIX. A RAPID CLINICAL METHOD FOR CARBON MONOXIDE DETERMINATION - G. VOLATILE SUBSTANCES OF TOXICOLOGICAL INTEREST - L. FELDSTEIN AND KLENDSHOJ'S SYSTEM FOR THE DETERMINATION OF VOLATILE POISONS BY MICRODIFFUSION - H. OTHER MISCELLANEOUS APPLICATIONS OF THE MICRODIFFUSION PRINCIPLE - LI. TOTAL MOLECULAR CONCENTRATION IN FLUID SAMPLES OF ABOUT 3-4 MILLIGRAMS - LII. SEPARATION OF CRYSTALS AND' GUMS' BY MICRODIFFUSION - QUALITATIVE MICRO-DIFFUSION ANALYSIS - LIII. SOME CONSIDERATIONS ON QUALITATIVE MICRO-DIFFUSION ANALYSIS - PART III - THE ERROR OF VOLUMETRIC TITRATION - LIV. INTRODUCTORY - LV. THE VARIABLE GLASS ERROR - LVI. THE TOTAL VARIABLE GLASS ERROR AND ITS CONTROL - LVII. THE VARIABLE CHEMICAL ERROR IN TITRATION - LVIII. THE RATIONALE OF MICRO TITRATION - LIX. THE CONSTANT GLASS ERROR - LX. THE CONSTANT CHEMICAL ERROR - LXI. VOLUMETRIC ERROR IN KJELDAHL NITROGEN ANALYSES - LXIII. UREA EXCRETION AS RENAL FUNCTION TEST - REFERENCES - INDEX OF SUBJECTS -
Author : Ewa Jaszczak-Wilke
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (131 download)
Download or read book Application of the Ion Chromatography Technique with Pulsed Amperometric Detection (IC-PAD) to Track the Intake of Cyanide Ions by the Human Body with Relation to Tobacco Addiction and Diet written by Ewa Jaszczak-Wilke and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
