Detection and Estimation of Microquantities of Cyanide

Abstract

When the end point was approached as indicated by the change to a light brown color, 2 ml. of the starch solution were added from a buret, the sides of the beaker were washed down, and the titration was continued to a colorless solution. This part of the procedure was conducted in a fume cupboard because of the formation of hydrogen cyanide. No colored particles of the cadmium complex should be present in the bottom of the beaker.This procedure was used for 1 to 75 mg. of cadmium oxide.1 to 20 mg. required 0.0078 M potassium iodate 20 to 40 mg. required 0.0156 M potassium iodate 40 to 75 mg. required 0.0312 M potassium iodate

Recent Advances in the Colorimetric Detection of Cyanide

“…[56] The formation of coloured water-insoluble cyano-metal complexes has already led to the development of a variety of different spot tests, [47] that can detect as low as 8 μM cyanide. [57] Drawbacks are the interference with various different anions as well as the timeconsuming sample preparation and/or slow colorimetric response. A short time ago, different research groups have applied novel transition metal-based receptors to overcome these limitations.…”

The use of dicobalt edetate (Kelocyanor) in cyanide poisoning

“…Sodium fluoride prevents the production of cyanide in stored blood; this source of error was therefore eliminated (Curry, Price and Rutter, 1967;Simpson, 1971, personal communication). The cyanide levels were measured by the method of Gettler and Goldbaum (1947). At autopsy, more blood, brain, bile and urine were collected for cyanide estimations ( Table 2).…”

Development of solid state samplers for work atmospheres

“…Solid state sorbers mentioned in ::he literature include filter paper impregnated with ferrous sulfate and alkali (giving Prussian blue as a color detection when subsequently submerged in dilute sulfuric acid) [14,41] and silica gel impregnated with silver chloride, mercurous chloride, or other metal salt to yield insoluble cyanide and free HCl (the latter being detected with an indicator such as bromothymol blue or bromcresol green) according to a German patent mentioned by Bark and Higson [37] Mercurous diphenylcarbazide paper wetted with 3 percent NaHCOa has been used by Tanaka and Yamamoto (1961) [12] who found a linear relation between the length of the pink zone and the amount of HCN, up to 6 yg/100 ml air.…”