东江东莞段水质卫生学调查

Investigation of water quality in Dongguan reach of Dongjiang River

目的了解东江东莞段水质状况,为该水域的治理和保护提供科学依据。方法于2012年3月对东江东莞段7个监测点进行采样,测定23个水质指标。按GB 3838—2002《地表水环境质量标准》进行评价。结果东江东莞段水温变化明显,水质呈弱酸性至中性,色度从清澈透明至发黑不等;氨氮属于Ⅲ～Ⅴ类水标准,溶解氧为2.10～7.60 mg/L,高锰酸盐指数为2.03～13.19 mg/L,五日生化需氧量为2.75～11.31mg/L,在上游均为Ⅱ类水标准,其他均超过Ⅲ类水标准;7个监测点的金属元素中除大盛、中围和泗盛的钾、钠、钙和镁浓度较高外,其余均较低。结论东江东莞段水源主要受有机物污染。

Objective To know the water quality of Dongguan reach of Dongjiang River and to provide the data for the protection of water source. Methods Seven monitoring points were set up and 23 water quality indexes were determined in March, 2012, and then the data was analyzed according to the GB3838-2002 Environmental Quality Standards for Surface Water. Results Changes in water temperature were obvious, water quality changed from weak acid to neutral;The level of NH3-N belonged to III- V grade, the levels of DO （2.10-7.60 mg/L）, CODM, （2.03-13.19 mg/L）, BOD5 （2.75-11.31 mg/L） at the upstream all belonged to II grade, and the others belonged to more than Ⅲ grade; There were high concentrations of K, Na, Ca and Mg in Dasheng, Zhongwei and Sisheng. Conclusion The dominant pollutants in Dongguan reach of Dongjiang River are organic pollutants.