Key Laboratory of Karst Dynamics, MNR & GZAR, Institute of Karst Geology, Chinese Academy of Geological Sciences, Guilin 541004, China.
International Research Center on Karst under the Auspices of UNESCO, Guilin 541004, China.
Int J Environ Res Public Health. 2022 Nov 22;19(23):15435. doi: 10.3390/ijerph192315435.
Three high-frequency sampling and monitoring experiments were performed at the Lutang and Luowei transects of the Liujiang River entrance and at the southeast exit of the Liuzhou during 2019 for the purpose of assessing physico-chemical variables and human health hazards of water heavy metals in different rainfall processes. There were significant seasonal variations in concentrations of 11 heavy metals and most variables showed higher levels during the dry season. The distribution of heavy metals in the Liuzhou area varied significantly by region. Pollution source analysis indicated distinct seasons of wetness and dryness. The dry season is dominated by anthropogenic activities, while the wet season is dominated by natural processes. The results of hazard quotient (HQ) and carcinogenic risk (CR) analysis showed that the health risk of non-carcinogenic heavy metals in the wet season is slightly higher than that in the dry season. Seasonal changes in carcinogenic risk are the opposite; this is due to the combined influence of natural and human activities on the concentration of heavy metals in the river. Among them, Al was the most important pollutant causing non-carcinogenic, with As being a significant contributor to carcinogenic health risk. Spatially, the downstream Luowei transect has a high health risk in both the dry and rainy seasons, probably due to the fact that the Luowei transect is located within a major industrial area in the study area. There are some input points for industrial effluent discharge in the area. Therefore, high-frequency monitoring is essential to analyze and reduce the heavy metal concentrations in the Liujiang River during dry and wet seasons in order to protect the health of the residents in the area.
2019 年，在柳江入海口的鹿塘和雒维断面以及柳州市东南出口进行了三次高频采样和监测实验，目的是评估不同降雨过程中水体重金属的理化变量和对人体健康的危害。11 种重金属的浓度存在明显的季节性变化，大多数变量在旱季的水平较高。柳州市各区域重金属分布差异显著。污染源分析表明存在明显的干湿季节。旱季以人为活动为主，雨季以自然过程为主。危害商（HQ）和致癌风险（CR）分析结果表明，雨季非致癌重金属的健康风险略高于旱季。致癌风险的季节性变化则相反；这是由于自然和人为活动对河流水体中重金属浓度的综合影响所致。其中，Al 是造成非致癌的最重要污染物，As 则是致癌健康风险的重要贡献者。空间上，旱季和雨季下游的雒维断面的健康风险都很高，这可能是因为雒维断面位于研究区域内的一个主要工业区，该区域有一些工业废水排放的输入点。因此，为了保护该地区居民的健康，有必要进行高频监测，以分析和降低柳江在旱季和雨季的重金属浓度。
