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KMID : 0353019720090010133
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Korean Journal of Public Health
1972 Volume.9 No. 1 p.133 ~ p.138
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A Study on the Sanitary Condition of Wells in Koje Island
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Abstract
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A study was carried out to find the sanitary condition of wells in Koje Island, Kyoungnam Province, from July 16, to July 30, 1971. Salinity was measured to check the seepage of sea water by the silver nitrate titration method and coliform groups were examined by the membrane filter method as well as the general sanitary state of wells and their surroundings.
Main findings were as follows;
1. the average chloride ion concentration of 41 wells examined was 54.0ppm with the standard deviation of 31.8 which was below the maximum permissible concentration of 150.0ppm in drinking water.
2. the mean chloride ion at lower district wells was the highest of 69.9 ppm which looked to be influenced by the sea water.
3. no relation was found between the concentration of chloride ion and the pollution of wells which seemed to be more affected by the sanitary state of wells and their surroundings.
4. coliform groups were positive at 25 wells(61.0%) out of 41 and at 17 out of 21 of less than 2 m depth and no coliforms were found at the wells of more than 3 m one. Water-proof structure of 3 m depth was necessary to protect wells from pollution.
5. coliforms were found at all 15 wells within the 6 m distance from the pollution sources, but 3 out of 13 of more than 10 m one.
6. the rates of coliform positives were 92.8 percent at higher districts, 37.8 at lower ones and 27.2 at coastal ones.
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