Residual soil is one of most widely employed sampling materials for tracing geochemical anomalies in geochemical exploration. Systematic studies on the phenomenon of the formation of geochemical anomalies in residual soils are being carried out by the Geological Survey of India. All the different factors contributing to the retention of metal and leading to the formation of geocht!mical anom• alies are being studied in detail. The role of 'humus mat• ter' in soil is recognized as an important factor. The paper reports some results obtained on the reaction and equilib• rium of 'soil humus matter' with dilute solutions of heavy metals. such as copper, lead, zinc, nickel and cobalt. 'Humic add' was separated from a typical sample of soil and purified by electrodialysis. Suspensions of the 'hum ic acid' were brought to equilibrium with dilute solutions of the heavy metals, and the amount of heavy metal retained 'by the humic acid was measured. The equiJ.ibrium amount of metal retained was more or less the same for the f ive metals studied. The shape of the adsorption isotherm (metal retained ver sus equilibrium concentration in solu• tion) was different for the different metals. The equilib• rium concentration of the metals in solution required for maximum retention was in the order Pb < Cu < Zn

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