Macro-porous hum

ie acid resins (HAR) bearing-N=N-bond or ester and／or ether bond were prepared by erosslinked polystyrene derivatives and humic aeids．Azo type HAR (AHAR) prepared under．HA/PSNH2 0.7—1.0 (wt．ratio) and coupling pH 13 conditions has the best adsorption properties for metal ions．The adsorption quantities for Cu2+ of ester and/or ether type HAR (EHAR) are increasing with increasing reae-tion time of EHAR formation．The structures of HAR were examined by IR-spectra．Adsorption capacities of AHAR for Cd2+，Ni2+，Mn2+，Cu2+，Co3+，Zn2+ are 1.01，0.60，0.59，0.56，0.55，0.53 mmol ion／g resin．respectively．The distribution coeffic-ients of metal ions on AHAR are Cu2+(8．7×103)>Cd2+(3.8×102)>Zn2+(2.4×102)>Ni2+(1.8×102)>Mn2+(4.9×10)

respectively．Cu2+，Cd2+，Ni2+，Mn2+ions can be quantitatively adsorbed and eluated by 1N HNO3 with AHAR．The resin can be regenerated and reused．The trace heavy metal ions in four kinds of nature wa-ter and tap water have been determined．