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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 understand the water quality of the Dongjiang section of Dongguan and provide a scientific basis for its management and protection. Methods In March 2012, 7 monitoring points of Dongjiang Dongguan section were sampled and 23 water quality indexes were measured. According to GB3838-2002 “surface water environmental quality standards” for evaluation. Results The water temperature in Dongjiang section changed obviously, the water quality was weakly acidic to neutral, and the color ranged from clear and transparent to black. Ammonia nitrogen belongs to Ⅲ ~ Ⅴ water standard, the dissolved oxygen is 2.10-7.60 mg / L, and the content of permanganate The index was 2.03 ~ 13.19 mg / L, the biochemical oxygen demand was 2.75 ~ 11.31 mg / L on the fifth day, the second class on the upper reaches of the water standard, the others exceeded the third-class water standard; seven monitoring points except for large Sheng, Zhongwei and Si Sheng potassium, sodium, calcium and magnesium concentrations higher, the rest were lower. Conclusion The Dongjiang water source in Dongguan is mainly contaminated by organic matter.