(1. Guizhou Provincial Key Laboratory of Mountain Environment, Guiyang, Guizhou 550001;
2. College of Biotechnology and Engineering, Guizhou Normal University, Guiyang, Guizhou 55000 1)
The arsenic content in the sediments of Hongfeng Lake and Baihua Lake in Guiyang City was investigated, and the distribution characteristics of arsenic in the sediments of the two lakes were analyzed. The results show that both lakes are polluted by arsenic, and Hongfeng Lake is more polluted than Baihua Lake, and its highest value is 2. 1 times of the background value of soil arsenic in Guiyang. Combined with the geographical location of the two lakes and the background of arsenic pollution in Guizhou, the causes of arsenic pollution in the sediments of the two lakes were analyzed preliminarily.
Arsenic pollution in sediments of Baihua Lake in Hongfeng Lake
Study on arsenic pollution in sediments of Hongfeng Lake and Baihua Lake Huang Xianfei 1, 2, Hu Jiwei 1, Qin Fanxin 1, Zhang Mingshi 1, Lian Guoqi 1. (1. Guizhou Provincial Key Laboratory of Mountain Environment, Guiyang, Guizhou 550001; 2. College of Biotechnology and Engineering, Guizhou Normal University, Guiyang, Guizhou 55000 1)
Abstract: The arsenic pollution in sediments of Hongfeng Lake and Baihua Lake, drinking water sources in Guiyang, was investigated, and the distribution characteristics of arsenic pollution in the two lakes were analyzed. The results show that both lakes are polluted by arsenic, and the arsenic pollution in the sediments of Hongfeng Lake is more serious than that of Baihua Lake, and its peak value is as high as 2. 1 times of the arsenic background value in Guiyang. When analyzing the source of arsenic in the two lakes, the geographical location, environment and arsenic pollution background of Guizhou Province are considered.
Keywords: Hongfeng Lake; Baihua Lake; Sediments; Arsenic pollution
Arsenic is a widely distributed element in nature and a common carcinogen in the environment. It can induce DNA oxidation and destroy DNA, and it is prone to skin diseases, cardiovascular diseases, nervous system diseases and cancer after long-term exposure to arsenic [1]. Arsenic poisoning is characterized by dizziness, headache, fatigue and low fever. , but also can make people suffer from stomatitis, corrosive gastritis, colitis and other diseases [2]. Organic arsenic can irritate gastrointestinal tract and oral cavity, and also damage nervous system. The order of toxicity is as follows: AsH3 > arsenious acid (arsenic (Ⅲ)) > arsenic (Ⅴ) > arsenate (arsenic (Ⅴ) > monomethyl arsenic (MMA) > dimethyl arsenic (DMA) > arsenic betaine (AB) and arsenic choline (AC), arsenic (Ⅲ) lethal, arsenic. Arsenic pollution in drinking water is one of the main ways of human exposure to inorganic arsenic environment.
Hongfeng Lake and Baihua Lake are two of the five major drinking water sources in Guiyang, located in the middle of Guizhou Plateau, northwest suburb of Guiyang, 32 kilometers away from the urban area (E 106? 0? 224′~ 106? 0? 243′，N 26？ 0? 23 1′~26? 0? 2 34') and 22 kilometers (E 106? 0? 229′~ 106? 0? 23 1′，N 26？ 0? 238′~26? 0? 240'), belonging to Wujiang River system, is the upper reaches of maotiaohe and two connected cascade reservoirs. The two lakes are naturally related in material migration and material balance. Hongfeng Lake is a first-class reservoir with many rivers entering the lake and large storage capacity. Baihua Lake is the lower reservoir of Hongfeng Lake, and its main recharge is the descending water of Hongfeng Lake. The distance between the two lakes is 10 km. In terms of natural environment, the two lakes have the same geological background and climatic conditions, and at the same time have their own sedimentary characteristics. After Hongfeng Lake is deposited, the substance enters Baihua Lake. Baihua Lake and Hongfeng Lake are typical areas for studying the geochemical cycle of elements in lake basins due to their special geographical environment structure [4]. Pollutants in lakes are mainly accumulated in lake sediments. When the lake environment changes, the pollutants in the sediments will be re-released into the water body [5-7], causing secondary pollution, which is a potential source of secondary pollution. Sediments have the significance of reflecting water system and are indicators of water pollution, and their environmental quality reflects the water pollution situation [8]. In this experiment, the content of heavy metal arsenic in the sediments of the two lakes was investigated, and it was found that the sediments of the two lakes had been polluted by arsenic.