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He proposed the albuminoid ammonia test and while has had considerable criticism has, nevertheless, served a good purpose. The albuminoid ammonia test and the determination oxygen consuming capacity have given the best information concerning the character a water supply, until the introduction bacteriological ter For many years the sanitary examination a drinking water consisted purely chemical tests and included the determination residue, cheap paper writing services chloride, oxygen consiuning capacity, free ammonia, albuminoid ammonia, hardness, dissolved gases and poisonous metals.

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Later, owing the demand for a clearer water free from iron and manganese, determinations alkalinity, carbondioxide, iron and manganese were added.

When bacteriological tests are made, surprising note the amount chemistry used the bacteriologist. Even in determining the number bacteria, the acidity the media must accurately adjusted chemical analyaiB. The determination the colon bacillus, as stated before, the most reliable research writing services index pollution, depends upon the chemical decomposition sugars in media whose acidity accurately adjusted. Other tests for the colon bacillus depend upon the chemical reaction toward litmus lactose agar or Endo's media. The formation indol and its recognition are chemical reactions used the bacteriologist. At present in the analysis drinking waters certain chemical tests may said supplement the bacteriological tests. These are the tests for organic matter.

They include tests for ammonia, albuminoid, nitrite, and nitrate, nitrogen, and the oxygen The inorganic constituents must not overlooked.

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Some serve as an index pollution, others have therapeutic significance.

Chl ide furnishes an example the usefulness a chemical test as an index pollution. It always present in sewage, hence in regions where the amount chloride present in normal waters varies with the distance from the sea custom written paper coast an excess chloride above the normal arouses suspicion.

It must remembered, however, help with my thesis that in other regions, especially ons which have been covered the sea, the normal chloride the water supplies high and its variation great that impossible use as an index pollution. The chemical analysis the inorganic soluble matter shows the therapeutic significance. Waters containing notable amounts the sulfates sodium, or magnesitun, or waters containing dis jolved gases, especially hydrogen sulfide, will have a physiological action those who drink them, especially those who are not accustomed them.

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can you write my essay Therefore, these waters containing large amounts sulphates or hydrogen sulphide are valuable mineral waters.

The chemical tests for the troublesome metals, iron and manganese, and the pQiBonous metals copper, lead, and zinc, must not overlooked. Copper, lead, and zinc are found in waters in mining regions and many waters will dissolve lead or zinc from pipes. The drinking these waters will cause serious illnesses. Iron and manganese if present assignment writers uk in sufficient quantity injurious are usually precipitated contact with the air and give warning against the use the water. To determine definitely the therapeutic value a water acciuHte determinations the chemical composition the mineral content waters are needed. These accurate determinations serve also show the value for use in boilers, for manufacturing purposes and for the determination methods water purification. The tests ordinarily made are for the positive ions, potassium, sodium, iron, aluminium, calciimii, magnesiimii, and for the negative ions, chloride, nitrate, sulfate, and carbonate. 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