| http://www.w3.org/ns/prov#value | - In a first method of the present invention employing absorption in the infrared region, a sample solution is in existence in a cell having a total reflection prism at least on one surface thereof, a measuring beam including light in the infrared region is introduced into the total reflection prism to be totally reflected, and absorbance at any one absorption peak which is present at 1200 to 1500 c
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