Lower temperature limit of NBS (DIN) pH standard buffer solution potassium tetroxalate

1979 ◽  
Vol 24 (1) ◽  
pp. 95-97 ◽  
Author(s):  
F.G.K. Baucke
Keyword(s):  
Temperature Limit ◽  
Buffer Solution ◽  
Standard Buffer ◽  
Lower Temperature Limit ◽  
Standard Buffer Solution ◽  
Lower Temperature ◽  
Ph Standard

Effect of Irradiation of the Extraction Mixture with 30% TBP in ISOPAR-M on the Lower Temperature Limit of Flame Propagation

2020 ◽  
Vol 62 (6) ◽  
pp. 723-729
Author(s):  
A. V. Rodin ◽  
I. V. Skvortsov ◽  
E. V. Belova ◽  
K. N. Dvoeglazov ◽  
B. F. Myasoedov
Keyword(s):  
Flame Propagation ◽  
Temperature Limit ◽  
Lower Temperature Limit ◽  
Lower Temperature ◽  
Extraction Mixture

scholarly journals Researches on the mixture limits of animal fats with liquid hydrocarbons for combustion at industrial level

2019 ◽  
Vol 112 ◽  
pp. 02001
Author(s):  
Dana Andreya Bondrea ◽  
Lucian Mihaescu ◽  
Gheorghe Lazaroiu ◽  
Ionel Pisa ◽  
Gabriel Negreanu
Keyword(s):  
Temperature Limit ◽  
Electric Heater ◽  
Liquid Hydrocarbons ◽  
Animal Fats ◽  
Lower Temperature Limit ◽  
Perfect Mixing ◽  
Efficient Combustion ◽  
Lower Temperature ◽  
Industrial Level ◽  
Experimental Researches

The experimental research has highlighted the variety of possibilities of combustion of animal fat from bovine and swine mixed with liquid hydrocarbons. Previous research has established that the upper limit for an efficient combustion was 30 %. For a perfect mixing, the lower temperature limit was set to 40 °C. In the fuel laboratory, at the department TMETF was determined the viscosity of the mixtures for different proportions. The values obtained for various concentrations and preheating temperatures were close to the values for liquid hydrocarbons. The experimental researches have studied the combustion of the mixture using a mechanically spraying burner with constant pressure between 14 and 18 bar. The aspiration of the mixture is done from a specially designed tank; this tank is equipped with an electric heater, in order to maintain the mixture at a constant temperature between 40 °C to 50 °C. After that, the burner heats again the mixture with an integrated heating device up to 75 °C. The burner is also equipped with an air blower, pump and a calibrated nozzle. The combustion resulted from the experimental boiler with a power rated to 55 kW were monitored with a thermal vision camera and an exhaust gas analyser. This research has demonstrated the viability of using this type of mixtures in energetic burning equipment designed for liquid hydrocarbons.

A lower temperature limit for the RIED effect

1994 ◽  
Vol 212-215 ◽  
pp. 1119-1122 ◽  
Author(s):  
A. Moroño ◽  
E.R. Hodgson
Keyword(s):  
Temperature Limit ◽  
Lower Temperature Limit ◽  
Lower Temperature

Different Adaptation Strategies of Atlantic Salmon (Salmo salar) Populations to Extreme Climates with Special Reference to some Cold Norwegian Rivers

1986 ◽  
Vol 43 (5) ◽  
pp. 980-984 ◽  
Author(s):  
Arne Johan Jensen ◽  
Bjørn Ove Johnsen
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Temperature Regime ◽  
Growth Rates ◽  
Temperature Limit ◽  
Fixed Temperature ◽  
Sea Temperature ◽  
Atlantic Salmon Salmo Salar ◽  
Lower Temperature Limit ◽  
Lower Temperature

Some of the salmon rivers on the western and northern coasts of Norway are very cold, and the sea temperature outside these rivers is almost always higher than that in the river. Growth rates of Atlantic salmon (Salmo salar) parr and smolt ages and sizes have been examined in three such cold rivers. We found indications that the lower temperature limit for growth of Atlantic salmon is not a fixed temperature, but varies from population to population according to the temperature regime of their environment. Smolts are small, with average sizes of 12–13 cm total length. Females dominated in number among the smolts, but the dominance was less pronounced than in most other rivers. Strategies used by Norwegian salmon in cold rivers are therefore different from those employed by salmon in the northern extremes of the salmon's range in Canada.

Tris/Tris·HCl: A Standard Buffer for Use in the Physiologic pH Range

1972 ◽  
Vol 18 (3) ◽  
pp. 206-208 ◽  
Author(s):  
Richard A Durst ◽  
Bert R Staples
Keyword(s):  
Phosphate Buffer ◽  
Silver Chloride ◽  
Chloride Cells ◽  
Reference Solution ◽  
Buffer Solution ◽  
Hydrochloride Salt ◽  
Ph Values ◽  
Standard Buffer ◽  
Ph Range ◽  
Ph Standard

Abstract A buffer solution containing tris(hydroxymethyl)-aminomethane (0.01667 mol/kg) and its hydrochloride salt (0.0500 mol/kg) is proposed as a pH standard for the physiologically important pH range of 7.3 to 7.5. Standard pH values were assigned to this reference solution at temperatures from 0° to 50°C by means of measurements with hydrogen/silver chloride cells without transference. At 37°C, the assigned pH of this buffer solution is 7.382, with a temperature coefficient of -0.026 pH unit per degree Celsius. This new standard is more compatible with biologic fluids than is the previously certified phosphate buffer.

scholarly journals Borax as a Standard Buffer Solution

Nature ◽  
1944 ◽  
Vol 154 (3914) ◽  
pp. 577-577 ◽  
Author(s):  
A. D. ELMSLY LAUCHLAN
Keyword(s):  
Buffer Solution ◽  
Standard Buffer ◽  
Standard Buffer Solution

scholarly journals Low-temperature limitation of bioreactor sludge in anaerobic treatment of domestic wastewater

2013 ◽  
Vol 69 (5) ◽  
pp. 1004-1013 ◽  
Author(s):  
Emma J. Bowen ◽  
Jan Dolfing ◽  
Russell J. Davenport ◽  
Fiona L. Read ◽  
Thomas P. Curtis
Keyword(s):  
Low Temperature ◽  
Domestic Wastewater ◽  
Temperature Limit ◽  
Anaerobic Treatment ◽  
Anaerobic Sludge ◽  
Anaerobic Reactors ◽  
Theoretical Yield ◽  
Lower Temperature Limit ◽  
Temperature Limitation ◽  
Lower Temperature

Two strategies exist for seeding low-temperature anaerobic reactors: the use of specialist psychrophilic biomass or mesophilic bioreactor sludge acclimated to low temperature. We sought to determine the low-temperature limitation of anaerobic sludge from a bioreactor acclimated to UK temperatures (<15 °C). Anaerobic incubation tests using low-strength real domestic wastewater (DWW) and various alternative soluble COD sources were conducted at 4, 8 and 15 °C; methanogenesis and acidogenesis were monitored separately. Production of methane and acetate was observed; decreasing temperature resulted in decreased yields and increased ‘start-up’ times. At 4 °C methanogenesis not hydrolysis/acidogenesis was rate-limiting. The final methane yields at 4 °C were less than 35% of the theoretical potential whilst at 8 and 15 °C more than 75 and 100% of the theoretical yield was achieved respectively. We propose that the lower temperature limit for DWW treatment with anaerobic bioreactor sludge lies between 8 and 4 °C and that 8 °C is the threshold for reliable operation.

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