PRACTICAL SKILLS

ANALYSIS AND EVALUATION OF THE RESULTS OF LABORATORY TESTS OF

DRINKING WATER

The Aim:

• Hygienic control of drinking-water supply involves systematic laboratory testing of water samples in order to assess compliance with GOST 950-2000 "Drinking Water"

For the development of the skills necessary to:

• Results of laboratory studies of drinking waterGOST 950-2000

Sequence of actions

• 1 to determine the type of water analysis carried out in the laboratory (abridged, general physico-chemical, virological special, special toxicology, special radionuclide)

Determination of water color:? To determine the color of water I took water samples number 1, № 2, № 3, filtered through a filter, poured water height of 20 cm into the cylinders. Further lowered into the water white plate and determined there? have examined whether the color of water compared with the plate. Conclusion Water is colorless

2 with reduced water- analysis to determine compliance with GOST 950-2000 following indicators:

• Total bacterial count, coliform indexSmell, taste, turbidity, pHResidual aluminum, residual chlorine, residual ozoneFlyuoris , manganese, iron, chloride

Determination of acidity of the water from the values of hydrogen pH

Cups I rinsed several times with water analyzed number 1, № 2, № 3, then poured into each test water. At 1-2 down in the tube test paper. The resulting color of the test paper compared with the scale of acidity on the cover. Conclusion water is slightly alkaline pH 7-8

3 at the general physico-chemical analysis to determine compliance with GOST 950-2000 following indicators:

• Solids, stiffness iron, sulfates, chloridesPolyphosphates, surfactants, mineral oilArsenic, nitrate, nitrite, lead, fluoride, manganese

4 for a special virological and parasitological analize- determine compliance with GOST the following indicators

• coliphagespathogenic protozoahelminth eggs

5 in a special toxicological analize- determine compliance with GOST 950-2000 or MAC list following parameters: barium, boron, cadmium, molybdenum, nickel, mercury, selenium, strontium, chromium, cyanide, gologensoderzhaschie volatile compound, benzene, gasoline (a) pyrene pesticides, phenol.

6 For a special radiation analysis to determine compliance with GOST:

• Total volume alpha activityTotal volume beta activity