Metals, HeavyCadmiumMercuryMetallothioneinMetalsSoil PollutantsLeadZincHeavy Metal Poisoning, Nervous SystemCopperWater Pollutants, ChemicalIndustrial WasteEnvironmental PollutionPhytochelatinsChromiumEnvironmental MonitoringNickelWater Pollution, ChemicalEnvironmental PollutantsArsenicCadmium ChlorideMercury PoisoningCobaltCadmium PoisoningSpectrophotometry, AtomicChelating AgentsManganese