Determination of SO4-2 ions in natural waters by titration of lead salts in the presence of dithizone Plan: Introduction…………………………………………………………………………………………………………
Interpretation of the literature
I.1.Physical properties, composition, chemical formula, anomalies and other peculiarities of water…………………………………………………………………………………….
I.2. Qualitative composition of substances. Qualitative and quantitative analysis ……………………………… ..
I.3.Pollution of water basins ……………………………………………………………………………………………….
I.4.Geochemical pollution of waters………………………………………………………….
I.5. Information on sulfur and its compounds ……………………………………
I.6. The amount and sources of sulfates in water……………………………………………………
I.7.Methods of determination of sulfates in water………………………………………………………….
I.8.Instrumental and non-instrumental methods of chemical analysis ………………….
II. Experimental part
II.1.Determination of sulfates in natural waters by titration of lead salts in the presence of dithizone ………………………………………………………………
II.2. Necessary reagents and equipment…………………………………………………………………….
II.3. Calibration drawing ……………………………………………………………………..
III. Analysis of the obtained results ………………………………………………………………………….
Conclusion………………………………………………………………………………………………………
References …………………………………………………………………………
Introduction RELEVANCE OF THE TOPIC. The high growth of production in modern industry, along with the intensive use of natural resources in the economy, has led to an increase in the emission of toxic substances into the environment, which is sufficiently detrimental to the development of human, animal and plant life. Therefore, prevention of environmental pollution is one of the global challenges.
At a time when the amount of drinking water is 2.5% of the total amount of water, the provision of ecologically clean water to the population is one of the ways to maintain their health and the flora and fauna of the planet.
While the problem of providing clean water is attracting everyone's attention, there is a practical opportunity to study the ecology of water supplying the Surkhandarya region, where we live. This is due to the fact that many problems in hydrochemistry, hygiene and environmental protection are currently solved by scientific and experimental methods, and not only the amount of toxic substances, but also their physical and chemical form in each object is determined and controlled by special physicochemical hydrobiological methods.
Among the pollutants of the environment, heavy metals are known to be extremely dangerous. Therefore, the amount of heavy metals is strictly controlled at each facility. President I.A.Karimov in his congratulatory address to the participants of the Tashkent regional conference on preparations for the VI World Water Forum on the proper use of water for industry, agriculture and human consumption said: As in many other parts of the world, the rational and equitable use of water resources has become vital for the peoples of the world, as in the second half of the last century our region was on the brink of ecological catastrophe due to the reckless use of large transboundary rivers. shows that we need to know that it is important. Among the heavy metals that pollute the environment, arsenic and its compounds are considered dangerous enough. Some of its compounds are very harmful to human health and are carcinogenic.
In order to study a certain part of the ecological changes in the water of Surkhandarya, it is possible to determine the amount of fluorine compounds and to reveal certain patterns through the results obtained.
OBJECTIVE: Quantitative determination of toxic fluoride terms in Surkhandarya water is to identify and scientifically assess the main contaminants of the fluoride patterns over time and distance, as well as the physicochemical form of the water with high sensitivity.
Selected object: Surkhandarya is one of the largest tributaries of the Amudarya. The length of the river is 196 km. In the middle of the river there are the southern Surkhan reservoirs. The river is mainly polluted by agricultural, industrial and domestic wastewater. The total mineral content of the river water is 300-600 mg / dm in the upper part and 1100-1300 in the lower reaches of the Amudarya. The average dissolved oxygen content is 10.7 mg / l.
The theoretical significance of the work is that the information provided in the main and experimental parts of the work can be used by students of chemistry, chemical technology, biology and ecology as a textbook. Of practical importance is the analysis of experience and results of the work, which can be used by health and hygiene workers as information.
Photometric determination of sulfur ions in Surkhandarya water with barium nitrate.
