ChloroformTooth ExtractionTrihalomethanesSolid Phase ExtractionSolventsPlant ExtractsMethanolChemical FractionationHydrocarbons, HalogenatedLiquid-Liquid ExtractionChromatography, High Pressure LiquidCataract ExtractionChromatography, Thin LayerMethylene ChlorideEtherChromatography, GasTrichloroethyleneBathsSwimming PoolsSolanum nigrumTrichloroethanesHexanesSerial Extraction2-PropanolWater Pollutants, ChemicalChromatography, Supercritical FluidTrichloroacetic AcidWater SupplyOrthosiphonCajanusReproducibility of Results