Document oBE3L0wa13nQnnGz54qr8mmr

Indue trial Hygiene Digoat February, 1956 ENVIRONMENTAL. MEASUREMENTS 268 Colorimetric Determination of.Carbon Monoxide la Air by an improved piidj.,m Chloride Method. T. H. Allen and W. S. Root. J. Biot. Chem. Zl6. 309-317 (1955). Christman's method of analyzing carboa monoxide la air by the redaction of palladium chloride waa extensively improved ao that U la auitable for uae la physiological experiments. VUh aamplea of leaa thaa 100 cc. It la poaalble to analyze aamplea ranging la CO content from 94.2 to 0.010% or even leaa, with a recovery of 99. 6% and a ataadard deviation of 2.217*. The lowermoat limit of the method, which haa not been approached, ia determined by the accuracy with which the least quantity of palladium chloride can be accurately meaaured by spectrophotometry of palladium iodide aolutlona. - Chem. Abate. 269 Aa Improved Palladium Chloride Method for the Determination of Carbon Monoxide In Blood. T. H. Allen and W. S. Root. J. Biol. Chem. 216, 319-323 (1955). Aa Improved palladium chloride method for the determination of carbon monoxide ia 0.2 to 1. 0 cc. of blood la described. The reaulta agree well with thoae obtained with a preciae-gaaometric method. -- Chem. Abate. 270 Methoda for the Detection of Toxic Gaaea in Industry. Ho. 10. Chlorine. (Revised.) Great Britain, Department of Scientific and Industrial Research. 6 pp. (1955}. Obtainable from British Information Service, 30 Rockefeller Plaza, New York 20, N. Y. 20 cents. The original leaflet waa published In 1939. Ia thla revised edition the sections on occurrence, poiaoaons effects, and first aid have been rewritten, but only minor amendments have been made to the sections dealing with the method of detection. -- Cond. from Bull. Hyg. 271 Lead in Blood. A Rapid Method for Spoctrochcmtcal Analysis. Kathleen Kumler and T. P. Schreiber. Am. Ind. Hyg. Assn. Quart. 1&, 296-300 (Dec. 1955). Spectrographic methods that have been previously described give good correlation with chemicals, but are time-consuming. In a now method, which is fully deacribed, the speed la increased by the following factors: the use of partially oxidized blood, the presence of nitrogen In the analytical are gap, and a narrow (10 micron) entrance slit. In addition, the possibility of contamination has been greatly reduced. This results from the electrode loading technique and the need of very few reagents for the analysts. The accuracy and reproducibility of the method are good. 272 The Determination of Mercury In Urine--Single Extraction Method. E. E. Campbell and B. M. Head. Am. Ini Hyg. Assn. Quart. j, 27^-279 (Dee. 1955). Mercury Is determined by the mixed color method using dlthizone: Interfering elements are eliminated by complexing with versons and by pH control. The published ashing techniques have been studied in conjunction with the single extraction method. Careful oxidation of urine with potassium permanganate and aulfuric acid Is recommended. The sensitivity of the method is 1 microgram of mercury with an accuracy of 94.2 4.82%. The advantage of this procedure Is the speed of analysis; and purification of the reagents is unnecessary. - - Editor's summary 28. 11 206 1387