The Spatio-Temporal Change and Source of Nitrate and Nitrite Nitrogen in Aquatic System from Huai-He River in High Cancer Area
|Keywords||Nitrate nitrogen Nitrite nitrogen Temporal and spatial variation Source Analysis Pollution Assessment|
This article select high cancer area in Shenqiu County shicao Township as the study area, the Kaifeng Xinghuaying control area, using a combination of field surveys and experiments, and points the dry season and the rainy season in the study area and control area sampling, sample AA3 instrument determination. The data were analyzed using Matlab and other technology, analysis of water nitrate nitrogen, nitrite nitrogen changes in time and space, pollution sources, and based on national standards, groundwater nitrate nitrogen, nitrite nitrogen pollution assessment. Text is divided into six parts: Part I: introduces the second part of the content of nitrate nitrogen and nitrite nitrogen water pollution research progress and thesis: a comprehensive introduction to the of Shenqiu County shicao Township Overview and major environmental the third part of the question: introduces sampling point layout and sample collection, the fourth part of the test methods, as well as data processing and analysis methods: water nitrate nitrogen, nitrite nitrogen time change Part V: The water nitrate, nitrite nitrogen spatial variation analysis of Part VI: water nitrate and nitrite nitrogen source analysis Part VII: groundwater nitrate nitrogen, nitrite nitrogen pollution assessment and Countermeasures Through the above research, draw the following conclusions: (1 ) no significant seasonal variation in the surface water of the study area, nitrate nitrogen and nitrite nitrogen content; groundwater nitrate nitrogen obvious seasonal variation exists, but no obvious seasonal variation of groundwater nitrite nitrogen. Surface water, rain, drought and summer average content of nitrate nitrogen (1.39 mg · L -1 sup> and 1.24 mg · L -1 sup>) and nitrite nitrogen average content (0.08 mg · L -1 sup> and 0.07 mg · L -1 sup>) are very close; rainy season groundwater nitrate nitrogen average of 7.87 mg · L -1 sup>, nitrite nitrogen average of 0.03 mg · L -1 sup>; while the dry season groundwater nitrate nitrogen average of 1.90mg · L -1 sup > nitrite nitrogen average of 0.03 mg · L -1 sup>. (2) study area water nitrate nitrogen, nitrite nitrogen space unevenly distributed, there are significant regional differences. The rainy season surface water nitrate and nitrite nitrogen spatial distribution consistent with higher levels of samples distributed in sets and north shicao important vegetable growing areas. Rainy season groundwater nitrate nitrogen spatial variation than nitrite nitrogen obvious groundwater nitrate nitrogen content of high value mainly in the post-tensioned camp and its north and south of the seven villages; nitrite nitrogen content near addition to shicao set, North Steller Village and Shao Zhuang slightly higher, the other regions were lower nitrite nitrogen content. Dry season surface water sampling sites nitrate and nitrite nitrogen spatial distribution is also in line with the content of nitrate nitrogen and nitrite nitrogen content had no significant regional differences. Small changes in the dry season groundwater nitrate nitrogen space, sampling sites were lower nitrate nitrogen content the nitrite nitrogen spatial variation is relatively large. (3) an excess of nitrogen fertilizers in agriculture is an important reason to cause local groundwater nitrate nitrogen pollution. Analysis of nitrate nitrogen, nitrite nitrogen temporal and spatial variations found high nitrate nitrogen content of the samples are mostly located in the arable and vegetable groundwater; analysis in terms of land use patterns, groundwater nitrate nitrogen content of the highest value appear in the vegetable garden, and in seven samples of more than 30 mg · L-1, there are three vegetable plots groundwater. But not in the vegetable growing area groundwater nitrate nitrogen content is higher, neighborhoods emissions of nitrogen fertilizer effects, sewage, manure may affect groundwater nitrate nitrogen content is another important reason. (4) of the study area groundwater nitrate nitrogen and nitrite nitrogen pollution is very serious part of the shallow groundwater is not suitable for drinking. South of Yang in shicao set the camp, chenzhuang and Wang Village village wells bit groundwater nitrate nitrogen content exceeds the groundwater environment quality five standard for seriously overweight. Neighborhoods groundwater nitrite nitrogen content partially exceeded the standard the rainy season groundwater nitrite nitrogen content of the average of 0.01 mg · L-1, the dry season groundwater nitrite nitrogen content of an average of 0.04 mg · L-1, the rain, the dry season respectively, 13.1% and 13.3% of the wells bit more than the \Overall, local groundwater pollution has deteriorated the health of local residents there are certain risks.