CadmiumCadmium PoisoningSoilEnvironmental PollutantsSpectrophotometry, AtomicLeadSoil MicrobiologyEnvironmental MonitoringEnvironmental ExposureSoil PollutantsCadmium ChlorideCadmium CompoundsCadmium RadioisotopesMetals, HeavyMetallothioneinSoil Pollutants, RadioactiveZincPhytochelatinsBiodegradation, EnvironmentalPlant Roots