Using Water as an Infrared Solvent

Attenuated Total Reflectance Infrared Analysis of Aqueous Solutions.

“…Figure 2 shows the ATR spectra of acetic acid and citric acid in water. The position of the C-0 stretching band at 1270 cm.-1 and the minor absorption bands in the acetic acid spectrum agree with the aqueous transmittance spectra reported by Goulden (13) and Sternglantz (27) for the 950 to 1510 cm. ""1 region.…”

“…Potts and Wright (26) proposed the use of a transmittance screen in the reference beam of a double-beam infrared spectrophotometer to obtain a more useful Jo in the 1540 to 1000 cm.-1 region. Kaye (16) and Sternglantz (27) have investigated optical window materials suitable for use with water.…”

A proposed method for the rapid determination of lactose in separated milk and condensed whey by infra-red absorption

“…The analysis of dairy products by infra-red spectroscopy presents a number of special difficulties due to the aqueous medium and to the non-homogeneous nature of the materials presented for study (i). A number of water-resistant optical materials are now available for use as cell-windows (2), and Potts & Wright (3) have shown that quantitative analyses can be carried out successfully with aqueous solutions. Although the intense absorption of water obscures much of the infra-red region, it is relatively weak near 10 p, where lactose shows strong absorption bands.…”

A Bibliography of Infrared Spectra of Biochemicals

“…Acetic acid: 1220 AA; 76 CA; 52, 52c DA; 680 EA- Randall, 1049 (p. 103, liquid, 2-13 p ) ; LB I429-Herman, 1938 (vapor, 138"C., 1-15.5 p ) ; Ard, 1951 (CC14 solutions, 2-7.2 p , and <'SJ solutions, 7.2-15 p , with and without a slight excess of triethylamine) ;Hadzi, 1053 (liquid, 6.6-20 p ; equimolar water solution, 6.6-14.3 p ) ; Pierson, 1956 (gas, 2-15 p ) ; Sternglanz, 1956 (glacial and 10 per cent water solution, 2-15 p ) ; Wall, 1939 (CCI, solution, 2.8-5 p ) . methyl ester: 2228 CA; Barnes, 1944 (p. 71, liquid, 5.5-9.8 p ) ; Torkington, 1945 (liquid, 3-20 p ) .…”

“…A vitamin derivatives; retinene and retinene 2: Farrar, 1952 (2.7-14.3 p). L-Ascorbic acid; C vitamin: 5424 CA; 1208 EA- Weigl, 1952 (fluorocarbon mull, 2.8-3.8 p ;Nujol mull, 8.8-13.9 p ) ; LB I 463-Heintz, 1939 (dry film, 1-14 p ; water solution, 1-8 p ) ; Sternglanz, 1956 (KBr disk and 30 per cent water solution, 2-15 p ) ; Trotter, 1948 (mull, 2.8-14 p); Williams, 1937 (water solution, 2-8 p ) . Blz vitamin: LB I 464- Barer, 1949 (crystal, 2.8-3.6 p, 6.3-12.5 p) ; Jackson, 1951 (mull, 2.9-14.3 p ) . Benzoic acid, para-amino-: 1542 CA.…”