(1) C.A. Black (ed.), 1965. Methods of Soil Analysis. Agronomy Monograph No. 9, Part 1, American Society of Agronomy.Method SW9060 is modified as described for analysis of TOC in a nonaqueous sample. This method determines the TOC as the difference between total carbon (TC) and carbonate (inorganic) carbon (CC). This method is recommended for soil samples because it is difficult to acid pretreat soil samples to completely remove carbonates while not losing organic carbon, therefore, CC is determined on an aliquot and mathematically subtracted from TC determined from a separate aliquot of sample. TC analysis combusts a sample in a high temperature furnace with an oxygen carrier gas. Carbon is oxidized to CO2 which is then measured by infrared detection. This method is described in ASTM D5373 and is the same instrument technology used in SW9060. CC analysis consists of acidifying a sample with 0.1 N perchloric acid to convert carbonate and bicarbonate to CO2 . The CO2 is then sparged to a CO2 coulometer for quantification. This method, which is reference in ASTM D-513, Method G, has been used by the U.S.E.P.A.