Fraction distribution and bioavailability of soil heavy metals in the Yangtze River Delta-A case study of Kunshan City in Jiangsu Province, China

► We investigate fractions of soil heavy metals on industry zones. ► We study spatial structures and distribution characteristics of multiple soil heavy metals. ► Bioavailability and potential eco-toxicity of heavy metals related to industry types. ► Bioavailability of Cd and Pb were greatly affected by high strength anthropogenic activities among all metals considered. ► PCs spatial distributions were influenced by geochemical character, industrial sewage irrigation and soil physico-chemical properties.