Abstract
The surface water in the southern of Hanoi capital is researched by identifying δ2H and δ18O stable isotopes together with EC, DO, BOD5, COD, TSS. Surface water samples for studying include the Red river, Nhue river and Kim Nguu river, Thanh Nhan lake, Yen So lake and Van Quan lake were collected in the dry season (April) and the rainy season (August) in 2015. The stable isotope analysis results showed that the δ18O values is a range from -42.53‰ to -64.05‰ and, the δ2H values is the range from -5.09‰ to -8.79‰ under global meteoric waterline (in the water vapor region). The δ2H results of the rivers and lakes in the dry season are more negative than the rainy season with a small difference. The δ18O results of lakes in the dry season are more negative than the rainy season, but the δ18O results of river in the dry season are more positive than the rainy season. The results of the EC, BOD, COD, DO, TSS analysis showed that surface water environment has changed clearly in the two seasons and the contamination level in the dry season is usually higher than the rainy season. The lakes and rivers strongly influenced by human activities led to seriously pollution are Van Quan lake and Yen So lake, Nhue river and Kim Nguu river.
Highlights
Hanoi Capital is the center of culture, economy and politics of the country
The analytical results from rivers and lakes in the southern of Hanoi with the dry season and the rainy season are presented in Table 1 and Table 2 below
Measurement results showed that the EC values of rivers and lakes in southern of Hanoi are very high; the value of EC in the rainy season tends to increase in the dry season
Summary
Hanoi Capital is the center of culture, economy and politics of the country. there is a very high population density in Hanoi, and demand for clean water and waste process is extremely large. Many studies indicate that the impact of human activities has caused change in the surface water qualities in urban areas, where high concentrated population, emission activities take place to strengthen magnitude [2]. Stable isotope technique was used early in the research mixture process of surface waters in the 1970s by differential independent author groups. The stable isotope techniques combined with chemical analysis of the surface water samples were exploited and used effectively to assess surface water qualities such as the Katz et al (1997) authors [4] and Liu Xiangchao et al (2002) authors [5].
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