丰水期琴江干流水土铁、锰监测分析及其对用水安全影响评价

Monitoring and Analysis of Iron and Manganese in Water and Soil of the Main Stream of Qinjiang River during Flood Season and the Impact on Water Safety

琴江位于韩江上游,其水质对韩江流域用水安全至关重要。为探究丰水期琴江干流土壤和水体中铁、锰两种金属元素项目对用水安全的潜在影响,于2019年7月对琴江干流6个代表断面的土壤和水体中的铁、锰含量进行监测分析,并根据水质监测资料分析2017~2019年每年5~7月琴江中游尖山断面水体铁、锰含量变化情况。结果表明,各断面水体的铁含量均超过规定的限值,锰含量均低于限值;未发现琴江6个代表断面土壤的铁、锰含量对水体相应元素项目含量呈现明显正相关趋势,但发现2017~2019年丰水期尖山断面水体铁平均含量呈现逐年上升趋势。本研究综合评价认为琴江水体的铁可能会对用水安全产生不良影响,建议采取一定的治理措施。

Qinjiang River is the upstream of Hanjiang River.The water quality of the river is of vital importance to the water safety of Hanjiang River Basin.In order to evaluate the potential impact of iron and manganese in water and soil on water safety of the Qinjiang River during flood season,iron and manganese content in soil and water of six representative sampling sites of the main stream of Qinjiang River was monitored and analyzed in July,2019.Meanwhile,based on water quality monitoring data,the change of iron and manganese content in water of Jianshan sampling site located in Qinjiang River midstream from May to July of 2017 to 2019 each year was investigated.The results show that the iron content in water of each sampling site was higher than the limit specified in the Environmental Quality,while the manganese content is lower than the limit.Neither the iron nor manganese content in soil of the six representative sampling sites of Qinjiang River was found significantly correlated with the content of the same element in the corresponding site of river water.It was found that average content of iron in water of Jianshan sampling site showed a yearly upward trend during the flood season from 2007 to 2009.Through comprehensive evaluation,the authors hold that iron content in water of Qinjiang River might have adverse effects on water safety.This study suggests that certain measures be taken to reduce the potential impact.