Drift-free electronic integrator for respiration studies

1982 ◽  
Vol 20 (4) ◽  
pp. 457-460
Author(s):  
J. P. Modesto ◽  
K. M. C. da Silva
Keyword(s):  
Electronic Integrator

A Simple, Low-Cost, Electronic Integrator and Readout

1973 ◽  
Vol 16 (5) ◽  
pp. 0977-0978
Author(s):  
Hollis Shull
Keyword(s):  
Low Cost ◽  
Electronic Integrator

Isotope Structure of Uranium Line U I 5027.4 A and its Use for Isotope Analysis

1965 ◽  
Vol 19 (3) ◽  
pp. 84-86 ◽  
Author(s):  
Ch. A. Berthelot ◽  
K. F. Lauer
Keyword(s):  
Emission Line ◽  
Isotope Shift ◽  
Isotope Analysis ◽  
Electronic Integrator

Experiments on the isotope shift of U233, U236, U235, U234, and U233 in the uranium emission line U I 5027.4 A are made with the photoelectric interferometer Hypeac. The ratios U235 + U234/U233 and U233 + U231/U238 can be determined with the Automatic Electronic Integrator. The possibility of interference between the lines U235 5027 295 A and U236 5027.338 A is discussed

Gas-Liquid Chromatography and Flame Photometric Detection of Phosphine in Wheat

1978 ◽  
Vol 61 (4) ◽  
pp. 829-836 ◽  
Author(s):  
Thomas W Nowicki
Keyword(s):  
Liquid Chromatography ◽  
Screening Method ◽  
Gas Liquid Chromatography ◽  
Gas Chromatograph ◽  
Aluminum Phosphide ◽  
Photometric Detection ◽  
Residual Aluminum ◽  
Flame Photometric Detection ◽  
Rubber Septa ◽  
Electronic Integrator

Abstract A screening method using gas-liquid chromatography with flame photometric detection has been developed for determining phosphine in wheat. Phosphine is measured as the sum of physically bound intact phosphine and that derived from residual aluminum phosphide. Wheat is extracted in a closed, partially evacuated glass system by refluxing with 10% sulfuric acid. Liberated gases are swept into a gas-collection flask fitted with rubber septa to permit gas sampling. Aliquots of collected gas are injected into a gas chromatograph. Phosphine is quantitated by peak area as determined by an electronic integrator. Recoveries varied with concentration: 67% was recovered at 0.10 ppm and 98% was recovered at 19 ppm. For concentrations less than 1.5 ppm, the coefficient of variation was 9.95%. Using flame photometric detection, phosphine concentrations as low as 0.04 ppm were easily determined in wheat.

Electronic Integrator with Immediate Digital Output

1958 ◽  
Vol 29 (5) ◽  
pp. 355-359 ◽  
Author(s):  
B. L. Hisey ◽  
E. R. Perl
Keyword(s):  
Digital Output ◽  
Electronic Integrator

Collaborative Study of Simultaneous Carbon, Hydrogen, Nitrogen Determination by Two Automatic Analyzers

1971 ◽  
Vol 54 (4) ◽  
pp. 808-818
Author(s):  
Laverne H Scroggins
Keyword(s):  
Collaborative Study ◽  
Critical Factor ◽  
Detector Response ◽  
Temperature Differential ◽  
Combustion Time ◽  
Accuracy And Precision ◽  
Electronic Integrator ◽  
On Line ◽  
Electronic Integration ◽  
The One

Abstract A collaborative study was conducted, using 2 types of automatic carbon-hydrogen-nitrogen analyzers. Thirty collaborators performed duplicate analyses on 6 samples with the duplicates being run on different days. Two collaborators sent a set of results for both types of apparatus. The samples studied were sulfadiazine, sulfanilamide, benzyl isothiourea hydrochloride, nicotinic acid, stearic acid, and ethyl laurate. A critical factor was the choice of parameters or parameter combinations such as the catalyst used, combustion time, combustion temperature, reduction temperature, temperature differential between main and sub-ovens of the gas chromatographic column and detector unit, and use of on-line computer or electronic integrator. Evaluation of the data and overall consideration indicate that satisfactory results for carbon, hydrogen, and nitrogen may be obtained with either instrument. It is further indicated that certain conclusions will make possible an improvement in the results obtained by these apparatus. High combination temperature, low temperature differential between ovens, and the use of electronic integration of the detector response seem to be required for good accuracy and precision with the one apparatus. High temperature, longer combustion time, additional catalyst, and electronic integration led to better results with the other. It is, therefore, recommended that, before adoption as official first action, a second collaborative study be made, using the parameters indicated by this study.

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