School of Geographic and Environmental Sciences;
Guizhou Normal University;
Guiyang 550025;
Guizhou;
China;
State Key Laboratory of Ore Deposit Geochemistry;
Institute of Geochemistry;
Chinese Academy of Sciences;
Guiyang 550081;
Guizhou;
China;
CAS Center for Excellence in Comparative Planetology;
Hefei 230026;
Anhui;
China;
School of Chemistry and Materials Science;
Guizhou Normal University;
Guiyang 550025;
Guizhou;
China;
Research Center of Karst Ecological Civilization;
Guizhou Normal University;
Guiyang 550025;
China;
Gold nanoparticles; Atomic absorption spectrophotometry; Quantitative analysis; Organic matter;