I

immission 43-44, 48 immobilization of metals 125

increased metal adsorption and decreased extractabilities with time 256 indicator elements 272 industrial waste 34, 45 influence of pH 235, 327 ingestion 172, 194, 227, 270,

287,310 inhibitory effects of copper 296 inner hydration shell 157 inner-sphere complexes 204,

247-248 inorganic ion pairs 235 insect larvae 178 insects 226, 296, 328 interactions at the site of toxic action 279 interactions between fish gill and metals, hydrogen, and cations 280

inter-metallic interactions 264 internal metal load 270 internal regulation 318 interstitial (pore-)water concentrations 173 interstitial water toxic units"

(IWTUs) 176 intracellular uptake 301 in-vitro extraction tests 267 ion-exchange 169, 212, 244, 256 ion-selective electrodes 166, 168, 216

iron reducing bacteria 253 irreversible adsorption 254, 255 irrigation 226 isoelectric point (pHIEP) of minerals 220 isotope dilution technique 153 IW-to-LC50 ratio 179 IWTUs 176, 179, 180

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