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Lake water usually contains what indicators? ? In order to determine whether to swim

everyone arena2010-01-27 11:01:45 +0000 #1

hongxing1506072010-01-27 11:16:35 +0000 #2
water physical and chemical properties and dynamic characteristics. Mainly refers to the physical properties of lake water temperature, color, transparency, smell, and taste. Chemical properties of dissolved and dispersed in water by the gas, ions, molecules, colloidal material and suspended solids composition, micro-organisms and determined the content of these substances.

Lakes, the main chemical components dissolved in water and the general similarity of natural water and its evaluation index is also the same as with the natural water. Serious pollution of lakes, we need determination in aquatic toxic substances such as phenol, heavy metals and so on.

According to the size of the lake water salinity, usually divided into two lakes: ① fresh water, salinity is less than 1 g / l; ② lagoons, salinity 1

35 g / l; ③ Salt Lake, mineralization degree at 35 g / liter. China Yangtze River lakes are freshwater lakes, lake mineralization of less than 200 mg / liter. Qinghai-Tibet Plateau in China's lakes are mostly saltwater, salinity in the 1

20 grams / liter.

Lake's chemical composition and the size of the degree of mineralization have more closely related to freshwater in the water main ion is HCO and Ca, while in the lagoons and salt lakes, with the increased salinity, CI, and increased the relative content of Na Great.

In the lake water quality effects of the factors, in addition to water quality in common with other natural factors (such as the chemical composition of water supply, climate, geology and soil conditions), there are lakes and their shape, size and biological activities within the process of lake . These factors on the lake's water quality, especially for lake water temperature, dissolved gases and biological protoplasm have a great impact. This is different from lake water, the main features.

Lake for the slow flow. The slow turn of the lake in the lake water in time to stay much longer than in the riverbed, so weather conditions on the lake water quality impact than the impact on river water quality should be significant. In humid areas, the inflow of water into the lake over the lake evaporation, causing lake overflow. In this case, a lower degree of water mineralization. In arid or semi-arid areas, evaporation exceeds the inflow of rivers into the injection volume, accumulation of the chemical composition of the river into the lake is often a high degree of mineralization. Lake the size of the lake water quality has a significant influence, large lakes have a stronger ability to regulate, when the lake water is much larger than injection into the river when the lake water quality and inter-annual changes in seasonal changes are not significant.

Lake water alternating slow the most important consequence is that the chemical composition of water in vertical distribution of heterogeneity, which is the water quality of lake water quality is different from the typical one of the rivers. The temperature of the lake varies with water depth (see), the water temperature has a direct impact on dissolved gases, especially dissolved oxygen content, in most cases, each part of the lake, particularly at different depths, dissolved gas content is not the same The. Typically, large and deep lake temperature is lower, weaker biological processes. The content of dissolved gases within a year depending on water temperature changes in the process, dissolved oxygen content in winter the largest and the smallest in summer. In a small lake, the heating conditions due to good strong summer photosynthesis, water containing dissolved oxygen excess. Therefore, the surface oxygen content of small lakes are usually higher. In the lake bottom sludge, the organic matter due to lack of oxygen, anaerobic microbial decomposition under the action of hydrogen sulfide (HS) and methane (CH biogas). The living protoplasm lakes (NO, NO, HPO, HPO, NH) of the changes in the lake and the lake is not the same, in the bottom of the lake, due to the decomposition of organic matter bottom of the lake, the water content of biological protoplasm large, lake surface water within the biological protoplasm content smaller. The vertical difference between lake water quality is different from the lake water quality in the river water quality and groundwater quality of the most notable features.

Is man-made lake, its water and lakes with similar chemical characteristics, the difference is that early stages of filling the reservoir area, as villages, farmland and hills of the submerged rock, there are a large number of organic compounds dissolve in water.



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