当前世界环境

Introduction

Water is most essential to life next to air only. The two main sources of natural water are underground and surface water. Ground is essential for health, society and sustainable developments. The natural quality of groundwater tends to be degraded by human activities. Pollution is one of the major problems of the environment today almost every aspect of life poses healthy risks introduction of massive quantities of waste materials at any point in the biosphere may overload it disrupting the natural recycling mechanism thus the air we breath, the water we drink the drugs we user and the places where we live and work may be contaminated by toxic substances. We get concerned about the quality of water, when in its physical chemical and biological characteristics or it quality deteriorates and become harmful to man, his domestic needs or other aquatic life such a situation is referred to as aquatic pollution. Different parameter of water has been analyzed and assessed the suitability of Drinking water in public hygiene scenario. Some parameters are prescribed by ISI and WHO while other are beyond the limits. Nature mainly consists of air, water, soil; unbalancing of any three causes major problems in natural process.

Material and Methods

The samples were collected during the month Jan 2008. Samples for analysis were collected in sterilized bottles (plastic with acid washed). pH values of the ground water samples under investigation were measured using systronic pH meter, type 361. The pH was standardized buffer solution of 4.0pH and 9.2pH. Total Alkality of the ground water samples were determined by titrating With N/50 H₂SO₄using phenolphthalein and methyl orange in indicator. The total hardness of the water samples were determined by complexometric titration with EDTA using eriochrome black-T as an indicator. Calcium-EDTA Titrimetric method, the estimation of chloride ions is generally determined by titrating the water sample against a standard solution of silver nitrate using potassium chromate as an indicator. Sodium and potassium were estimated using flame photometer (128) technique. NO₃^2-, SO₄^2-were estimated using UV-visible spectrophotometer. EC values of the ground water samples under investigation were measured using systronic EC meter.

Results and Discussion

Table 1: Click here to view table

The pH of the water body indicates the degree of deterioration of water quality. The desirable pH range necessary for drinking water is from 6.5 to 8.5. The pH value of water sample in the study area ranged from 8.0 to 8.6. The desirable limit for total alkalinity is 200mg/L.The value of ground water samples were varied from 312 mg/L to 542 mg/L. The desirable limit for Total hardness in drinking water according to I.S.I. and ICMR is 300 mg/L. Its values in Ground-water samples varied from 208 mg/L to 503 mg/L. calcium in the ground water is 100 ppm.⁴在目前的调查钙含量范围d from 44 mg/L to 82 mg/L. Ground water pollution by sodium salt is an unavoidable phenomenon caused form the return flow of irrigation and disposal of industrial and urban wastes. In large concentration it may affect a person with cardiac diffencies . Sodium values in ground water samples varied from 186 mg/L to 301 mg/L. Potassium is an essential nutrient for plants Potassium values in ground water samples varied from 3.01 mg/L to 126.3 mg/L.. The chloride is troublesome in irrigation water and harmful for aquatic life. Chloride values in ground water samples varied from 252 mg/L to 461 mg/L.

Sulphate content more than 200 ppm is objectionable for domestic purpose, as water having more than 500 ppm taste bitter and beyond 1000ppm has purgative effect.^5,6,7Sulphate values in surveyed area varied from 0.0 mg/L to 16 mg/L. Excessive concentrations of nitrate¹²in drinking water may cause methemoglobinemia in small children.Nitrate is good for plant nutrient. Its values in ground water samples varied from 2.8 mg/L to 9.81 mg/L E.C. values are responsible to make the criteria of ground water. The Electrical conductivity values of water sample in the study area ranged from 1370 to 2200 micromhos/cm at 25⁰C. Total dissolved solids is an important parameter for drinking water and water to used for other purposes.The permissible limit of TDS suitable for drinking is 500 mg/L. Its values in ground water samples varied from 876 mg/L to 1408 mg/L.

Acknowledgements

The authors are highly thankful to Er. L.N. Agarwal (Executive Engineer, Div Ground water Lab. Unit -2, Gwalior M.P.) and Dr. A.K. Singh for helpful Suggestion

References