Acknowledgement
The authors highly appreciate Lenny H. E. Winkel, Pham Thi Kim Trang, Vi Mai Lan, Caroline Stengel, Manouchehr Amini, Nguyen Thi Ha, Pham Hung Viet, and Michael Berg for the publicly-available hydrochemical As data of Red River Delta. This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2021R1A2C1094272).
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