1. Apportionment of a solute between two phases. The terms parttion or extraction may also be used in this sense were appropriate.
2. Dispersal of a substance and its derivatives throughout the natural environment or throughout an organism.
3. Final location(s) of a substance within an organism after dispersal.

The term "distribution" was found in the following pages:

Manganese concentrations in air particulates higher in residential neighborhoods than industrial sites, varies by region | EVISA's News
Instrument database: Shimadzu Europe - MALDI-7090: MALDI TOF-TOF Mass Spectrometer
Arsenic species in rice: Origin, uptake and geographical variation | EVISA's News
Directory of scientists: Jason K. Kirby
Enhanced level of toxic methylmercury in the aquatic environment caused by hydroelectric dams | EVISA's News
Determination of Thallium Speciation in Water Samples by HPLC-ICP-MS | EVISA's News
Seabass populations can be differentiated by their Mercury Isotope Distribution | EVISA's News
Instrument database: Zinsser Analytic GmbH - LIPOS®
X ISTERH 2013: International Society of Trace Element Research in Humans | EVISA's Agenda of Events
Link database: Spain: Institute of Environmental Assessment and Water Research (IDĘA) - Spanish National Research Council (CSIC)
Solid-phase extraction in speciation analysis | EVISA's News
Company database: Berthold Technologies GmbH & Co. KG
Journals database: Water Quality Bulletin
ICP-MS Analysis Suggests Metal-Binding Proteins Significantly More Abundant Than Thought | EVISA's News
Company database: British Geriatrics Society (BGS)
Company database: Mallinckrodt Baker, Inc
Link database: Toxipedia: Lead
Flow-injection inductively coupled plasma mass spectrometry for speciation analysis | EVISA's News
Instrument database: JEOL - JAMP-7810
Instrument database: Oxford Instruments - INCAEnergy TEM