Nitrites are distinguished from nitrates by effervescing and yielding brown fumes when treated with a little dilute sulphuric acid.
They think that the nitritesact by depressing the nerve endings in the veins as well as the arteries.
If there is no cardiac dropsy, but other symptoms of heart tire are manifest and the blood pressure is high, the nitrites are valuable.
Nitrites had better be postponed, if possible, for cardiac emergencies.
The only value of the nitrites is when the blood pressure is high and the nitrite action is desired on that account.
They found that the nitrites caused a fall in venous pressure as well as arterial pressure, although the heart might be accelerated and more regular.
Chlorine, ammonia, and nitrates and nitrites are in themselves innocuous substances, but are estimated because they supplement the somewhat imperfect information obtained from the organic matter itself.
Dr Frankland takes the sum of the nitrogen existing in the water as ammonia and as nitrites and nitrates, as a sort of measure of the minimum amount of animal or sewage matter destroyed.
The porosity and physical attraction of the soil lead to the oxidation of the organic matter contained in the sewage, as instanced in the discovery of nitrates and nitrites in the effluent water, which did not exist previous to filtration.
Ammonium nitrite, NH4NO2, is formed by oxidizing ammonia with ozone or hydrogen peroxide; by precipitating barium or lead nitrites with ammonium sulphate, or silver nitrite with ammonium chloride.
Each of these ferments thus has its distinctive function to perform in this most important process, the nitric ferment being unable to act on ammonia, as the nitrous ferment is unable to convert nitrites into nitrates.
What the sources of these nitrates and nitrites (which exist in quantities so minute that accurate determination of their amount is rendered extremely difficult) are is a disputed point.
To this class belong the denitrifying organisms already referred to which reduce the nitrates and nitrites in the soil.
Nitrites are usually considered more objectionable than nitrates; both are innocuous unless associated with disease-producing nitroörganisms.
There are also traces of nitrates and nitrites obtained from the air.
Nitrates and nitrites alone are not injurious in water, but they are usually associated with objectionable bacteria and generally indicate previous contamination.
Hence a process of oxidation is required to change the ammonia into nitrites and the nitrites into nitrates.
Nitrates obviously contain a considerable amount of oxygen, but ammonia contains no oxygen, and nitritesvery much less than nitrates.
Müntz's criticism that the nitrifying organisms only oxidise from nitrogenous matter to nitrites, and not from nitrites to nitrates.
As early as 1881 Professor Warington had observed that some of his cultures, though capable of changing nitrites into nitrates, had no power of oxidising ammonia.
Winogradsky concluded that the oxidation of nitrites to nitrates was brought about by a specific organism independently of the nitrous organism.
Ammonia is then transformed to nitrites by certain bacteria present in the soil, while other bacteria change nitrites into nitrates.
This precaution is necessary as the medium is liable to take up nitrites from the atmosphere, and an opinion as to the absence of nitrites in the cultivation is often based upon an equal colouration of the medium in the control tube.
Some few forms (the nitrite and nitrate formers, Chapter XI) obtain their energy from the oxidation of inorganic nitrogen compounds, ammonia and nitrites respectively, and not from carbon.
Reduction of nitrates tonitrites or to ammonia or even to free nitrogen is brought about by a great many different kinds of bacteria.
Very small traces of nitrites may be easily detected by this method.
The diammine salts are prepared by the action of alkalinenitrites on cobaltous salts in the presence of much ammonium chloride or nitrate; they are yellow or brown crystalline solids, not very soluble in cold water.
Nitrites are oxidised by free chlorine and consequently do not interfere with the estimation of it by the thiosulphate method; the influence of ferric salts can be overcome by substituting 3 c.
It must not be inferred from what has been said that the nitrites are of no value.
It is sometimes of advantage to combine digitalis with the nitrites although they are said to be physiologically incompatible.
The nitrites may be detected by a solution of metaphenyldiamine, which strikes a red colour with an infinitesimal quantity.
To detect nitritesin the blood, the best method is to place the blood in a dialyser, the outer liquid being alcohol.
Further, a second process occurs, the process of oxidation of these nitrogen compounds already noticed, and the ammonia and nitrites resulting from the decomposition are built into nitrates.
As a result of these putrefactive changes, the nitrogen products of animal life are broken frequently into compounds as simple as ammonia (NH3), or into compounds which the chemists speak of as nitrites (Fig.
Now, it is true that the nitrates and nitrites in gunpowder residues will react positively with diphenylamine and diphenylbenzidine, but they are not specific.
The bacteria oxidizing ammonia to nitrites were grown on the following medium; 1 gm.
The nitrites are further oxidized by another kind of micro-organisms into nitrates and they also can be raised without organic material.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "nitrites" in a variety of sentences. We hope that you will now be able to make sentences using this word.
