scholarly journals Simple photometric determination of free cyanide ion in aqueous solution with 2,6-dichlorophenolindophenol

2006 ◽  
Vol 4 (2) ◽  
Author(s):  
Abdollah Yari ◽  
Kazem Kargosha
Keyword(s):  
Aqueous Solution ◽  
Photometric Determination ◽  
High Accuracy ◽  
Photometric Method ◽  
Free Cyanide ◽  
Optimal Conditions ◽  
Cyanide Ion ◽  
Accuracy And Precision ◽  
Photometric Titration

AbstractIn this work, a simple photometric method with high accuracy and precision for measuring trace amounts of free cyanide ion in aqueous solution is demonstrated. Under the evaluated conditions, we could determine CN− concentration in the range of 5–70 ppm easily. The work is based upon the photometric titration of CN− with Co(II) in the presence of 2,6-dichlorophenolindophenol (DCPIP) at λmax = 602 nm in aqueous solution. The optimal conditions, such as pH, ionic strength, and concentration of chromopher were evaluated. The interence effect of many other cations and anions studied and the results are given here. The optimized titration was successfully used to determine the concentration of free cyanide ion in aqueous solutions.

Spectrophotometric study of the reactions of lanthanoids with bromopyrogallol red in the presence of cation active tensides

1982 ◽  
Vol 47 (2) ◽  
pp. 503-508 ◽  
Author(s):  
Irena Němcová ◽  
Pavla Plocková ◽  
Tran Hong Con
Keyword(s):  
Absorption Spectra ◽  
Photometric Determination ◽  
Spectrophotometric Study ◽  
Ternary Complexes ◽  
Optimal Conditions ◽  
Bromopyrogallol Red ◽  
Binary Complexes

The absorption spectra of the binary complexes of lanthanoids with bromopyrogallol red were measured and the formation of ternary complexes with cation active tenside, Septonex, was studied. Optimal conditions were found for the formation of these complexes and the possibility of their use in the photometric determination of lanthanoids was demonstrated on several examples.

Automatic Flame Photometric Determination of Potassium in Fertilizers. A. Elimination of Anion Exchange Cleanup. B. Using Direct Available P2O5 Extract

1965 ◽  
Vol 48 (6) ◽  
pp. 1095-1100
Author(s):  
James P Ussary ◽  
Charles W Gehrke
Keyword(s):  
Anion Exchange ◽  
Primary Standard ◽  
Photometric Determination ◽  
Photometric Method ◽  
Potassium Salts ◽  
Commercial Fertilizer ◽  
Aoac Official ◽  
Primary Standards ◽  
Standard Grade

Abstract Three primary standard grade potassium salts, eight Magruder check samples, and 18 commercial fertilizer samples were analyzed by three methods. Primary standards gave an average recovery of 100.0% and an average range of 0.21% K20. Magruder check samples averaged 0.09% K20 higher by the modified flame photometric method than the grand averages of the STPB results on the respective Magruder reports. The modified flame photometric method averaged 0.02% K20 lower than the official flame photometric method and 0.11% K20 higher than the official STPB method on 18 commercial fertilizer samples. The automatic flame photometric method, without anion exchange cleanup, is rapid enough for routine analysis and is as accurate and precise as the AOAC official methods. The method was also applied to the direct available P205 extract. Results on three primary grade potassium salts, seven Magruder check samples, and 13 commercial fertilizer samples were as accurate and precise as the official STPB method.

Elimination of Aliquoting in Automated Flame Photometric Determination of K2O in Fertilizers

1984 ◽  
Vol 67 (4) ◽  
pp. 847-850
Author(s):  
Layna D Steele ◽  
Kelly J Ramsey ◽  
Peter F Kane
Keyword(s):  
Full Range ◽  
Flow Analysis ◽  
Photometric Determination ◽  
Photometric Method ◽  
Official Method ◽  
Significant Saving ◽  
Large Numbers ◽  
Continuous Flow Analysis ◽  
Automated Instrument

Abstract Current automated instrument systems used in conjunction with the official AOAC flame photometric method for K2O in fertilizer, 2.D06, all require a dilution step to bring the fertilizer extract to the appropriate concentration range. Two CFA (Continuous Flow Analysis) automated instrument systems are described which together eliminate aliquoting over the full range of fertilizer potassium, a significant saving of analyst effort if large numbers of samples are analyzed. The systems have performance characteristics well within the limits in the official method, and produce results comparable to current methods on routine samples.

scholarly journals Determination of Sodium in Biological Materials by Instrumental Neutron Activation Analysis

1997 ◽  
Vol 80 (4) ◽  
pp. 871-882 ◽  
Author(s):  
William C Cunningham ◽  
Stephen G Capar ◽  
David L Anderson
Keyword(s):  
Neutron Activation Analysis ◽  
Instrumental Neutron Activation Analysis ◽  
Activation Analysis ◽  
Neutron Activation ◽  
Biological Materials ◽  
High Accuracy ◽  
Analytical Technique ◽  
Accuracy And Precision ◽  
Instrumental Neutron Activation

Abstract A formalized method for determining sodium in biological materials by instrumental neutron activation analysis is presented. The method includes common procedures from the numerous options available to this historically nonformalized analytical technique. The number of procedural options is restricted to minimize the method’s complexity, yet the method is still applicable to a variety of neutron activation facilities. High accuracy and precision are achieved by placing bounds on allowed uncertainty at critical stages of the analysis. Analytical results from the U.S. Food and Drug Administration laboratory and 4 other laboratories demonstrate the method’s performance.

Dextrose Determination in Honey: A Rapid Photometric Determination

1964 ◽  
Vol 47 (3) ◽  
pp. 488-491
Author(s):  
Jonathan W White
Keyword(s):  
Glucose Oxidase ◽  
Selective Adsorption ◽  
Photometric Determination ◽  
Glucosidase Activity ◽  
Accuracy And Precision ◽  
Routine Procedures ◽  
Alpha Glucosidase ◽  
Water Ratio

Abstract The granulating tendency of honey may be predicted by the dextrose-water ratio. The reducing disaccharides in honey complicate the determination of dextrose by routine procedures. True glucose can be determined in honey with a glucose oxidase reagent in which the contaminant alpha-glucosidase activity is inhibited. Accuracy and precision of the method are comparable with those of the selective adsorption procedure, and it is more suitable for routine control use.

scholarly journals Determination of metribuzin content in pesticide formulations using electroanalytical methodology

2018 ◽  
pp. 43-51
Author(s):  
Ana Djurovic ◽  
Zorica Stojanovic ◽  
Snezana Kravic ◽  
Tijana Zeremski ◽  
Nada Grahovac ◽  
...  
Keyword(s):  
Mercury Electrode ◽  
High Accuracy ◽  
Reduction Peak ◽  
Accuracy And Precision ◽  
Pesticide Formulations ◽  
Relative Standard ◽  
Single Well ◽  
Curve Method ◽  
Commercial Pesticide

The work presents results of the determination of metribuzin content in commercial pesticide formulations by applying chronopotentiometry with thin film mercury electrode as an electrochemical sensor. In the analyzed pesticide formulations, a single well defined reduction peak of metribuzin is observed at the potential around -880 mV. The content of the herbicide in commercial formulations is determined using the calibration curve method, by applying the initial potential of -0.21 V, and the final potential of -1.10 V. Recovery values based on the declared and found content of the active ingredient are in the range from 100.67% to 101.68%, with the values of relative standard deviation lower than 1.00%, indicating high accuracy and precision of the presented method.

scholarly journals Determination of chromium (VI) in the dust of gas treatment plants in steelmaking plants.

2020 ◽  
pp. 42-44
Author(s):  
V. A. Makarov ◽  
T. K. Savosteenko
Keyword(s):  
Hexavalent Chromium ◽  
Raw Materials ◽  
Potassium Dichromate ◽  
Least Square Method ◽  
Photometric Determination ◽  
Least Square ◽  
Photometric Method ◽  
Gas Treatment ◽  
Gas Cleaning

The requirements for the content of hexavalent chromium in cements and raw materials for its manufacture are described. The problem with the utilization of dust from gas treatment plants of metallurgical plants at metallurgical enterprises is given. The influence of the chemical composition of the dust of gas cleaning plants of metallurgical plants on the determination of hexavalent chromium is established. A method for measuring the hexavalent chromium in the dust of gas cleaning plants of metallurgical plants by the photometric method is described. A method has been developed for extracting hexavalent chromium from dust at the cleaning units of metallurgical plants for subsequent photometric determination. An extraction method has been established to prevent underestimation of the hexavalent chromium content. The determination of hexavalent chromium was based on the formation of a blue-violet complex with diphenylcarbazide. Calibration was carried out on aque solutions with a known concentration of hexavalent chromium. For the preparation of calibration solutions, potassium dichromate of chemical purity was used. The concentration of hexavalent chromium in each calibration solution was carried out by a calculation method, overlapping the entire measurement range. The measurement of optical density was carried out on a photoelectric colorimeter type KFK-3, at a wavelength of 540 nm. Analysis of the obtained calibration dependence showed a good correlation. The calibration factor was calculated using the least square method. Extraction of hexavalent chromium from the sample to be analyzed was performed with water. The reducing effect of iron was eliminated with a solution of phosphoric acid. The developed technique is used when conducting certification control of dust from gas cleaning units of metallurgical plants, as well as during research.A validation procedure was carried out. Obtained acceptable limits of repeatability and reproducibility of the method.

Quantitative determination of drugs for therapy of COVID-19 in serum and plasma using liquid chromatography ― mass-spectrometry

2020 ◽  
pp. 43-47
Author(s):  
D. A. Farmakovsky
Keyword(s):  
Mass Spectrometry ◽  
Clinical Trials ◽  
Liquid Chromatography ◽  
High Accuracy ◽  
Therapeutic Drug ◽  
Liquid Chromatography Mass Spectrometry ◽  
Accuracy And Precision ◽  
New Drug Development ◽  
Real Clinical Practice

There was developed a method for quantitation of the drugs which could be effective for COVID-19 treatment. Using tandem liquid mass-spectrometry it is possible to simultaneously quantify with high accuracy and precision up to 9 medicines in human plasma. This method could be used for new drug development as well as for clinical trials and therapeutic drug monitoring in real clinical practice.

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