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Borate anions thus formed are titrated with standarized HCl or H2SO4 to determine the nitrogen content in the sample.


Moreover, the high reliability and durability of these systems due to the absence of moving parts have motivated their use in spacecraft electrical power, as in the Voyager spacecraft, launched into space in Nowadays, copper sulfate pent hydrated CuSO4. Take care to avoid spillage. When the sample becomes a transparent clear green-blue colour, we consider the digestion has finished.

L -1 has been obtained in the water analysis from the comparison between laboratories. An absolute method is isolation and direct weighing of the protein but this method is only used occasionally in biochemical research, as it is difficult and not very practical. Then, the results obtained are compared to the results provided in the comparative between laboratories.

Today is the most widely used method for protein analysis and is performed by determining organic nitrogen. Two selectable temperature gradients: Uniform heating of the aluminium block. It is essential to place the “Scrubber” unit with the neutralizing solution between the digester and the recirculation pump.


Notas de Aplicaciones

Thus, it is necessary that each laboratory validates the analytical methods used. Los resultados obtenidos se presentan en la siguiente tabla:.

Results obtained are shown in the following table:. Models Most important aspects: Results obtained in three different days. L – Vilafranca del Penedes. Control independiente de temperatura. Door open for more than 20 seconds. Para calcular la constante de Michaelis K M de la fosfatasa para el p-nitrofenil-fosfato, se determina la actividad de la enzima en distintas concentraciones de sustrato.

The establishment of a heat flow, opposite to the thermal diffusion, when a material subjected to a temperature gradient is crossed by an electric current, suggests thermoelectric cooling applications.

Place the Erlenmeyer flask in the refrigerant extension taking care it has to be submerged in the boric acid. CO2 valve open for more than 7 minutes in interrupted. Let the sample cool down to room temperature.

POTENCIOMETRÍA by Alexandra Alguera on Prezi

Normalidad Muestra de Amonio sulfato. Such programming capability optimizes digestions according to aplidaciones material used. This is obtained by boiling the sample in a sulfuric acid concentration. Then add a gram of potassium acid tartrate and read the conductivity every 2 minutes.

Kjeldahl distiller is fully automatic and with a titration system “on-line” real-time titration. AplicacionessWilforth found that digestion could be speed up by using sulfuric acid and adding a catalyst. The analysis result is a good approximation of crude protein content of the food as nitrogen also comes from non-protein components.


Calculate the amount of nitrogen detected. Los resultados obtenidos se presentan en las tablas 1 y 2.

Particularly it is worth mentioning a long list of advantages if compared with traditional ovens made with conventional heating elements and cold groups: Pesar entre 1 y 2 gramos de muestra. The result is an ammonium sulfate solution.

After distillation of a sample, perform a blank test by using the above described method, but using 5 ml of distilled water. These properties are essential in applications where the temperature must be controlled very precisely and reliably, such as in the containers used in transporting organs for transplantation or in those in which vibrations are serious disadvantages, for example: Selecta has tried to be aware of the latest technologies and methodologies in the field of laboratory equipments.

Peltier System Background The discovery of thermoelectric phenomenon two centuries ago, and the search for new alternative energy generation, has allowed continued progress in thermoelectric technology in recent years.