Instruments

Instrument	Description	Location	Cost (UW internal)	Contact information	Vendor link
Quantachrome Autosorb-1 [ Larger image. ]	The Quantachrome Autosorb-1 instrument is used for BET and Langmuir surface area, isotherms, pore size and surface area distributions, micropore volume and surface area. The Autosorb-1 can quantify the above mentioned parameters by dosing or removing a known quantity of nitrogen gas in a sample cell that contains the solid adsorbent which is maintained at the critical temperature of the nitrogen gas. By recording relative pressures changes as the gas is added or removed an isotherm is created.	WSEL Room 202	$45.84/sample	Chris Worley, caworley@wisc.edu, 608.262.2899	Autosorb-1 Series
Shimadzu TOC-V CSH and TNM-1 [ Larger image. ]	The Shimadzu TOC-TN instrument is capable of measuring total organic carbon, total carbon and inorganic carbon by utilizing a non-dispersive infrared (NDIR) gas analyzer and total nitrogen (TN) using a chemiluminescence detector (Note: currently do not have a TN cost calculated). Total carbon (TC) is analyzed by introducing the sample into the combustion tube heated to approximately 700 degrees C. A platinum catalyst in the combustion tube converts all carbon to CO2 and is then swept to the NDIR detector and quantified. Inorganic carbon (IC) is analyzed by adding a small amount of hydrochloric acid (during analysis) to obtain a pH of less than 3. This converts all carbonates to CO₂ and is volatilized by bubbling air or nitrogen (that does not contain CO2) through the sample. Total organic carbon (TOC) is commonly determined by two methods. The first is by subtracting the IC from the TC. What is left is the organic carbon. The second is the non-purgable organic carbon (NPOC) method. During analysis the sample is acidified to a pH of 2 or 3 and then sparged with carbon free gas. This eliminates the IC. The remaining carbon is referred to as TOC.	WSEL Room 108A	$2.97/sample	Chris Worley, caworley@wisc.edu, 608.262.2899	TOC Analyzers