In order to study the migration and transformation mechanism of Hg content and occurrence form in subsurface flow zone of gold mining area in Loess Plateau and its influence on water environment. the field in-situ infiltration test and laboratory test were carried out in three typical sections of river-side loess. alluvial and proluvial strata in Tongguan gold mining area of Shaanxi P... https://parisnaturalfoodes.shop/product-category/astringent/