A solution that maintains constant  pH by resisting changes in pH from dilution or addition of small amounts of  acids and bases. 

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

Instrument database: Bio-Rad Laboratories - BioLogic DuoFlow system
Instrument database: Prince Technologies B.V. - PrinCE 550 and 560 Capillary Electrophoresis System
Link database: EPA Method 3060A: Alkaline Digestion for Hexavalent Chromium
Instrument database: Prince Technologies B.V. - PrinCE-C 650 and 660 Capillary Electrophoresis Systems
Instrument database: Teledyne CETAC Technologies - CEI-100 Capillary Electrophoresis Interface for ICP-MS
Instrument database: RECIPE Chemicals + Instruments GmbH - GP3000 Gradient HPLC Pump
Instrument database: Waters Corporation - 3100 Mass Detector
All about Chromatography - Resources related to Chromatography | EVISA's News
CE-ICP-MS for speciation analysis | EVISA's News
Instrument database: Spectradyn Technologies LLC - CAPEL-series Capillary Electrophoresis Systems
Instrument database: Tecan - Power Washer 384
New Agilent HPLC column for routine determination of arsenic species in human urine by HPLC-ICP-MS | EVISA's News
Instrument database: Bio-Rad Laboratories - QuadTec UV/vis Detector
Material database: Sigma-Aldrich - Auxiliary reagent for AAS: Aluminum nitrate cesium chloride
Characterization and Speciation of Gold and Silver Nanoparticles by MEKC-ICP-MS | EVISA's News
Instrument database: Jasco Inc. - PU-2080 Isocratic HPLC pump
Instrument database: Bischoff Analysentechnik und -geräte GmbH - HPLC Compact Pump 2250
Side effects of cisplatin chemotherpy: Platinum speciation matters | EVISA's News
Instrument database: Gilson, Inc - GX-271 ASPEC™ SolidPhase Extraction system
Company database: Exaxol Corporation