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https://www.readbyqxmd.com/read/26839842/development-of-an-ion-chromatography-method-for-analysis-of-organic-anions-fumarate-oxalate-succinate-and-tartrate-in-single-chromatographic-conditions
#1
Yarbagi Kaviraj, B Srikanth, J Moses Babu, B Venkateswara Rao, S Paul Douglas
A single organic counterion analysis method was developed by using an ion chromatography separation technique and conductivity detector. This allows the rapid characterization of an API to support clinical studies and to fulfil the regulatory requirements for the quantitation of fumarate, oxalate, succinate, and tartrate counterions in active pharmaceutical ingredients (quetiapine fumarate, escitalopram oxalate, sumatriptan succinate, and tolterodine tartrate). The method was developed by using the Metrohm Metrosep A Supp 1 (250 × 4...
October 2015: Scientia Pharmaceutica
https://www.readbyqxmd.com/read/26838388/new-approach-to-the-fast-screening-of-plant-oil-samples-for-f-cl-br-and-s-organic-compounds-on-the-trace-level
#2
M E Chivarzin, I A Revelsky, A V Nikoshina, A N Buldyzkova, D A Chepeliansky, A I Revelsky, A K Buriak
The fast method of the simultaneous determination of F(-), Cl(-), Br(-) and SO4(2-) anions in the deionized water on the trace level by ion chromatography using thorough cleaning of respective water containers, 10 μM NaHCO3 water solution as eluent, short Metrohm (50 × 4 mm) separation column and a large water volume injection is proposed. Calculated detection limits are 10(-9)-10(-8)% depending on the element. The method for the fast screening of plant oil samples for the total fluorine-, chlorine-, bromine- and sulfur-organic compounds content (calculated for the respective elements) on the trace level is developed...
April 1, 2016: Talanta
https://www.readbyqxmd.com/read/25666649/a-preliminary-investigation-of-lithogenic-and-anthropogenic-influence-over-fluoride-ion-chemistry-in-the-groundwater-of-the-southern-coastal-city-tamilnadu-india
#3
S Selvam
A total of 72 groundwater samples were collected from open wells and boreholes during pre- and post-monsoon periods in Tuticorin. Samples were analyzed for physicochemical properties, major cations, and anions in the laboratory using the standard methods given by the American Public Health Association. The fluoride concentration was analyzed in the laboratory using Metrohm 861 advanced compact ion chromatography. The geographic information system-based spatial distribution map of different major elements has been prepared using ArcGIS 9...
March 2015: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/24783816/physico-chemical-analysis-of-drinking-groundwater-of-around-tehran-by-seasonal-variation
#4
F Pourfallah, S Javadian, Z Zamani, S D Siadat, Sh-Khatami, R Saghiri
This study was a cross-sectional descriptive study and done in four seasons during April 2011 to March 2012.The objective of the present study was to examine Physico-chemical properties of groundwater around Tehran. The results are also compared with the guideline values of Iranian legislation. A total of 160 drinking water samples were collected from different drinking groundwater around the Tehran. Total Dissolved Solids (TDS), conductivity and pH, were measured by using standard methods and the concentration of ions Cl-, F-, NO3-, NO2-, Br-, SO4(2-), PO4(3-), Ca2+, K+, Na+ and NH4+ in groundwater was performed using Ion chromatography (Metrohm Company, USA) with standard method...
January 15, 2014: Pakistan Journal of Biological Sciences: PJBS
https://www.readbyqxmd.com/read/23914556/-chemical-characteristics-of-water-soluble-components-of-aerosol-particles-at-different-altitudes-of-the-mount-huang-in-the-summer
#5
Bin Wen, Yan Yin, Yan-shuo Qing, Kui Chen
Aerosol was collected with Anderson cascade sampler at three altitudes of the Mount Huang in the summer 2011. Samples were analyzed by the ion chromatography (IC, Metrohm). The results showed that the mean mass concentrations of all the ions were 13.21 microg x m(-1), 10.94 microg x m(-3), 9.97 microg x m(-3), at the foot, mid height and the summit of the mountain, respectively. The mass concentration of water-soluble components of aerosol decreased with altitude. The major anion and cation of aerosols were SO4(2-) and NH4+, respectively...
May 2013: Huan Jing Ke Xue= Huanjing Kexue
https://www.readbyqxmd.com/read/23741859/nitrate-pollution-in-groundwater-in-some-rural-areas-of-nalgonda-district-andhra-pradesh-india
#6
K Brindha, R Rajesh, R Murugan, L Elango
Intake of water with high concentration of nitrate is a major problem in many countries as it affects health of humans. The present study was carried out with the objective of determining the causes for higher nitrate concentration in groundwater in parts of Nalgonda district, Andhra Pradesh, India. The study area is located at a distance of about 135 km towards ESE direction from Hyderabad. Nitrate concentration in groundwater of this area was analysed by collecting groundwater samples from 46 representative wells...
January 2012: Journal of Environmental Science & Engineering
https://www.readbyqxmd.com/read/23104673/submicrometer-aerosol-in-rural-and-urban-backgrounds-in-southern-poland-primary-and-secondary-components-of-pm1
#7
Wioletta Rogula-Kozłowska, Krzysztof Klejnowski
Diurnal samples of PM(1) (submicrometer particles, having aerodynamic diameters not greater than 1 μm) were collected at an urban background site in Zabrze (from 01.08. to 31.12.2009) and a rural background site in Racibórz (from 01.08. to 31.12.2010). The samples were analyzed for carbon (organic and elemental), water soluble ions (Na(+), NH(4) (+), K(+), Mg(2+), Ca(2+), Cl(-), NO(3)(-), SO(4)(2-)) and concentrations of 21 elements by using, respectively, a Sunset Laboratory carbon analyzer, a Herisau Metrohm AG ion chromatograph, a PANalitycal Epsilon 5 spectrometer...
January 2013: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/22511288/matrix-influences-on-the-determination-of-common-ions-by-using-ion-chromatography-part-1-determination-of-inorganic-anions
#8
Rajmund Michalski, Aleksandra Lyko, Iwona Kurzyca
Ion chromatography is the most popular instrumental analytical method used for the determination of anions and cations in water and wastewater. Isocratic ion chromatography with suppressed conductivity detection is frequently used in laboratories carrying out routine analyses of inorganic anions. The paper presents the results of the research into the influence of selected inorganic anions dominant in environmental samples (Cl(-), NO(3)(-), SO(4)(2-)) on the possibility of simultaneous determination of F(-), Cl(-), NO(2)(-), NO(3)(-), PO(4)(3-) and SO(4)(2-) with the application of this most popular ion chromatography type in standard separation conditions...
July 2012: Journal of Chromatographic Science
https://www.readbyqxmd.com/read/22349306/a-study-on-the-seasonal-mass-closure-of-ambient-fine-and-coarse-dusts-in-zabrze-poland
#9
Wioletta Rogula-Kozłowska, Krzysztof Klejnowski, Patrycja Rogula-Kopiec, Barbara Mathews, Sebastian Szopa
Diurnal samples of PM(2.5) and PM(2.5-10) were taken in an urban background area in Zabrze (Upper Silesia in southern Poland) in the winter (January-March) and summer (July-September) of 2009. The samples were analyzed for carbon (organic and elemental), water soluble ions (Na(+), NH(4) (+), K(+), Mg(2+), Ca(2+), F(-), Cl(-), NO(3) (-), PO(4) (3-), SO(4) (2-)) and concentrations of 27 elements by using, respectively, a Behr C50 IRF carbon analyzer, a Herisau Metrohm AG ion chromatograph, and a PANalitycal EPSILON 5 X-ray fluorescence spectrometer...
May 2012: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/22294293/validity-and-reliability-of-the-horiba-c-122-compact-sodium-analyzer-in-sweat-samples-of-athletes
#10
Eric D B Goulet, Tommy Dion, Étienne Myette-Côté
Accurate sodium replacement during prolonged exercise is possible when sweat rate and sweat sodium content are directly measured. Few athletes have access to sweat sodium content measurement, as the equipment needed to perform such analyzes is costly, laboratory-based or requires technical skills. Using 70 sweat samples collected in 24 athletes from 3 anatomical sites, this study determined the reliability [single-trial and inter-day (7 samples over 3 days)] and validity (instrument error) of a pocket-sized, easy-to-use and low cost sodium analyzer (Horiba C-122, Kyoto, Japan) against reference values of an ion chromatograph, the 883 Basic IC plus (Metrohm AG, Herisau, Switzerland)...
October 2012: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/21140668/determination-of-quaternary-ammonium-compounds-by-potentiometric-titration-with-an-ionic-surfactant-electrode-single-laboratory-validation
#11
Randi Price, Ping Wan
A potentiometric titration for determining the quaternary ammonium compounds (QAC) commonly found in antimicrobial products was validated by a single laboratory. Traditionally, QACs were determined by using a biphasic (chloroform and water) manual titration procedure. Because of safety considerations regarding chloroform, as well as the subjectivity of color indicator-based manual titration determinations, an automatic potentiometric titration procedure was tested with quaternary nitrogen product formulations...
September 2010: Journal of AOAC International
https://www.readbyqxmd.com/read/20873586/-determination-of-acrylic-acid-from-catalytic-preparation-lactic-acid-by-anion-exchange-chromatography
#12
Haining Shi, Hui Wang, Lizhi Tao, Zonghua Wang, Mingyu Ding
Acrylic acid is a kind of important monomer and basic organic chemical raw material. In the process of catalytic preparation of acrylic acid from lactic acid, in order to monitor the catalytic process effectively and timely, an anion-exchange chromatographic (AEC) method has been established for the simultaneous determination of lactic acid and acrylic acid. The separation was carried out on a Metrohm A Supp 5 anion-exchange column (150 mm x 4.0 mm) with 2 mmol/L Na2CO3 +2 mmol/L NaHCO3 as the mobile phase...
June 2010: Se Pu, Chinese Journal of Chromatography
https://www.readbyqxmd.com/read/18970565/interference-free-coulometric-titration-of-water-in-lithium-bis-oxalato-borate-using-karl-fischer-reagents-based-on-n-methylformamide
#13
William Larsson, Jan-Christoph Panitz, Anders Cedergren
A non-alcoholic coulometric reagent based on N-methylformamide (NMF) was shown to eliminate the severe interference effect caused by the alcohol component of the conventional Karl Fischer (KF) reagent on the battery electrolyte lithium bis(oxalato)borate (LiBOB). For sample amounts up to 240 microg of water, the stoichiometry of the KF reaction deviated only slightly from the ideal 1:1 ratio for the best reagent composition. Both solid and dissolved (in acetonitrile, tetrahydrofuran (THF), and ethylene carbonate/ethyl methyl carbonate) LiBOB were titrated successfully using a Metrohm 756 KF Coulometer with a diaphragm cell...
March 15, 2006: Talanta
https://www.readbyqxmd.com/read/18969952/coulometric-karl-fischer-titration-of-trace-water-in-diaphragm-free-cells
#14
William Larsson, Anders Cedergren
Factors influencing the accuracy and precision for diaphragm-free Karl Fischer coulometric determinations of low mug-amounts of water have been studied using the Metrohm 756 (pulsed current) coulometer and eight different types of commercial coulometric reagents and some modifications of these. As in the case of diaphragm-free coulometric titration of large amounts of water, the positive errors, due to the formation of oxidizable reduction products (of sulfur dioxide) in the cathode reaction (besides hydrogen), were found to be minimized by the use of highest possible pulse current (in the range 100-400mA) in combination with the fastest possible titration rate...
March 15, 2005: Talanta
https://www.readbyqxmd.com/read/18924733/analysis-of-anions-in-beer-using-ion-chromatography
#15
Jonathan Bruce
The majority of anions found in beer are a consequence of impurities derived from the water used during the brewing process. The process of beer manufacture consists of malting, brewing and fermentation followed by maturation before filtration and finally storage. Strict quality control is required because the presence of certain anions outside strictly defined tolerance limits can affect the flavour characteristics of the finished product. The anions present were quantified using the technique of ion chromatography with the Metrohm modular system following sample preparation...
2002: Journal of Automated Methods & Management in Chemistry
https://www.readbyqxmd.com/read/16905580/sulphate-and-osteoarthritis-decrease-of-serum-sulphate-levels-by-an-additional-3-h-fast-and-a-3-h-glucose-tolerance-test-after-an-overnight-fast
#16
C M Blinn, B A Biggee, T E McAlindon, M Nuite, J E Silbert
BACKGROUND: Low sulphate levels in blood may contribute to osteoarthritis by decreasing cartilage chondroitin sulphation. OBJECTIVE: To measure serum levels of sulphate during 3 h of fasting or glucose ingestion after overnight fasts to determine how much sulphate lowering may occur during this period. METHODS: Sera from 14 patients with osteoarthritis who fasted overnight were obtained every 15-30 min during 3 h of continued fasting and during 3 h after ingestion of 75 g of glucose...
September 2006: Annals of the Rheumatic Diseases
https://www.readbyqxmd.com/read/16818461/effects-of-oral-glucosamine-sulphate-on-serum-glucose-and-insulin-during-an-oral-glucose-tolerance-test-of-subjects-with-osteoarthritis
#17
B A Biggee, C M Blinn, M Nuite, J E Silbert, T E McAlindon
BACKGROUND: and objective: Glucosamine is suggested to affect glucose transport and insulin resistance. The effects of oral glucosamine on serum glucose and insulin levels at the initiation and throughout the duration of a 3-h oral glucose tolerance test were examined. METHODS: Sera from 16 patients with osteoarthritis, but with no other diagnosed medical condition who had fasted overnight, were obtained every 15-30 min during the 3 h of continued fasting and during the 3 h after ingestion of 75 g of glucose with or without ingestion of 1500 mg of glucosamine sulphate...
February 2007: Annals of the Rheumatic Diseases
https://www.readbyqxmd.com/read/16231139/determination-of-tnt-and-its-metabolites-in-water-samples-by-voltammetric-techniques
#18
York Zimmermann, J A C Broekaert
Square-wave voltammetry with the hanging drop mercury electrode as the working electrode was used for the determination of ultratraces of explosives in aqueous solution. It was shown that the strong pressure dependence of the pneumatically controlled multimode electrode system of a conventional Metrohm apparatus could be compensated by an additional pressure regulation, through which the pressure variations could be decreased when switching from deaeration to the static measurements. By using square-wave voltammetry with this electrode system after this modification the limits of detection for 2,4,6-trinitrotoluene (TNT) and other TNT-metabolites could be decreased down to 0...
November 2005: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/16079170/low-levels-of-human-serum-glucosamine-after-ingestion-of-glucosamine-sulphate-relative-to-capability-for-peripheral-effectiveness
#19
B A Biggee, C M Blinn, T E McAlindon, M Nuite, J E Silbert
BACKGROUND: Oral glucosamine preparations are widely used as a treatment for osteoarthritis, purportedly functioning by a variety of mechanisms suggested by results of in vitro experiments, and generally using glucosamine concentrations well in excess of 100 micromol/l. OBJECTIVE: To use high performance liquid chromatography with a high sensitivity Metrohm-Peak instrument for pulsed amperometric measurement of human serum glucosamine; a detection limit of 0.5 micromol/l at 1:10 serum dilution allowed measurement of low levels of glucosamine in human serum, which previously has not been possible...
February 2006: Annals of the Rheumatic Diseases
https://www.readbyqxmd.com/read/12608750/chemically-modified-carbon-paste-electrode-for-iodide-determination-on-the-basis-of-cetyltrimethylammonium-iodide-ion-pair
#20
Mohamed Noor El-Deen Abbas
A new carbon paste electrode (CPE) for the determination of iodide ion based on a cetyltrimethylammonium iodide (CTMAI) ion pair as an electroactive material is described. The electrode shows a linear response for iodide ion over the concentration range of 4 x 10(-5) M to 1 x 10(-1) M with a lower detection limit of 4 x 10(-5) M at 25 degrees C. The electrode has a Nemstian slope of -55.0 +/- 0.4 mV/decade and a fast potential response of 45 s, which is almost constant over a pH range of 5.0 - 9.0. Selectivity coefficient data of the CTMAI-CPE for some common ions show negligible interference, and the electrode has high selectivity towards the iodide ion...
February 2003: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
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