The Huai River Basin is one of the main distribution areas in our country with iodine-rich groundwater,so iodine-rich groundwater has become another drinking water safety issue after arsenic-rich and fluorine-rich groundwater in the Huai River Basin.In this paper,the exposure risk assessment of 4997 groups of groundwater samples collected in the Huai River Basin was carried out by indicator Kriging analysis.The spatial distribution of primary iodine-rich groundwater was studied,and the exposure risk map of iodine content exceeding the threshold was given.The results show that:Iodine is the main primary poor quality index affecting groundwater quality in the Huai River Basin,showing obvious spatial variability.The iodine-rich groundwater in the Huai River Basin presents three distinct risk zones.The zone with risk of iodine(F＞0.9)in shallow groundwater(≤50m)covers 22780.60km2,accounting for 12.18％of the total area.The area of deep groundwater(＞50m)with high iodine risk(F＞0.9)is 13686.88km2,accounting for 7.32％.The primary cause of the groundwater system with high iodine content in Huai River Basin is the REDOX environment and the content of natural organic matter,and the migration of iodine is also promoted by agricultural irrigation.The application of the directive Kriging method to divide the high iodine risk area of groundwater in the Huai River Basin from the perspective of exposure risk assessment can provide scientific reference for effectively preventing and controlling the high iodine level in groundwater,and implementing the iodized salt supply zone to prevent excessive iodine intake and ensure drinking water safety.
Huai River Basiniodine-rich groundwaterindication krigingexposure risk
NETL
NSTL
维普
万方数据
