Document ExZz7kM4bgaJkeD8rVDYErKGx

Indus ir .. it- >L which results in the icrmaticn c: pir.k color. 7. is readier, is sensitive to 0.005 ppm. if the celor is read in a Btckmar.r. spectrcphctometer. Model OU. The standard deviation was determined for chromium concen trations ranging from 0.02 to 0.32 ppm, and four.d tc be 0.005 ppm, when 10-ml blood samples were used. -- Adders' Summary 1027 Spectrcchemical Deter mir.aticn of Lead ir. Small Quantities of Blood. ,H. Murata. J. Chem. See. Japan., Pure Cnem. Sect., 72 863-665 (1951) . Lead in small quantities oz* liquid, such as bicod or urine, was determined by an intermittent a.c. arc method with bismuth as the inter nal standard. The lines used were Pb 2833 and Bi 2898 A. The sample ____ (0.02 cc) was placed on the flat end of a carbon electrode heated to 70*C. evaporated, and heated to 110*C. and the arc.was.ignited. The standard solution contained 0.1-1000 gamma per cc. lead^nd 300 gamma per cc. ' bismuth. One gamma per cc. lead was determined. The continuous d.c.' arc and spark method did not give good results. About 30 gamma of lead was found in 10 cc. of the blood of healthy Japanese persons by this method This value is higher than the value determined by the dithizone method. -- Chem. Absts. l 1028 Polarographic Procedure for Urinary Thallium. G. S. Winn, . r- Edna L. Godfrey, and K. W. Nelscn. Arch. Ind. Hyg. & Occ. Med. 6, 14-19 (July 1952). Urine specimens are digested with a sulfuric-perchloric-nitric acid mixture. The residues are transferred to separatory flmnels, and the thalliuiz} is oxidized with bromine water. The resulting thallic ion is extracted, in acid solution, with dithizone in chloroform. Lead remains in the aqueous phase. The chloroform solutions are evaporated and digested with the sulfuric-perchloric-nitric acid mixture, the remaining sulfuric acid being removed in a muffle furnace. The resulting residues ' are taken up on ammonium acetate solution and polarographed. When compared with a standard curve the wave heights so obtained indicate the quantities of thallium present. The standard curve is prepared by adding fyiown quantities of thallium to urine, analyzing in the described manner, and plotting wave heights against thallium concentrations. -- Authors' Summary i 1029 Infrared Determination of Chlorinated Hydrocarbon Vapors in Air. P. F. Urone and Mary L. Druschel, Anal. Chem. 24^ 626-630 (April, 1952). Because of the toxicity of chlorinated hydrocarbon vapors in air, their analysis is of importar.ee. Infrared spectroscopy has a