Physicochemical or geochemical

• Ma, Q., Han, L., Zhang, J., Zhang, Y., Lang, Q., Li, F., Han, A., Bao, Y., Li, K., Alu, S., (2019), Environmental risk assessment of metals in the volcanic soil of Changbai Mountain, International Journal of Environmental Research and Public Health,, 16(11), 2047, 10.3390/ijerph16112047