Phosphoric acid ester tube

The Domestic Preparedness Program has tested two types of these tubes for CWA detection ability. For example, the thioether tubes can detect HD, and phosphoric acid ester tubes can detect nerve agents at very low concentrations. 

Detection in the field M18A2, M256, M256A1, M8 and M8A1 alarms, M8 and M9 paper, and Draeger Tube Phosphoric Acid Ester 0.05/a... 

The APD 2000 provides semi-quantitative identification of nerve agents. Colorimetric tubes are available which are designed to qualitatively detect vapors of phosphoric acid esters as well as the key decomposition products hydrogen fluoride (HP) and organic amines. Detection of agents with PIDs or FIDs may be possible. Detection and identification with FT-IR is possible provided that the appropriate reference spectra are available. 

Sampling and Analytical Precision and Accuracy. The accuracy of results obtained from a sampling and analytical method are determined by comparison with an independent method. The aerosols of phosphoric and sulfuric acids were collected on mixed cellulose ester filters (14 ) and analyzed by ion chromatography. Table V shows the collection efficiency of the 7-mm O.D./700-mg silica gel collection tubes with respect to the results obtained from filter samples, and the precision obtained from calculation of the pooled relative standard deviation. 

A synthesis of XIV was accomplished as follows (9) /J-carboline-1-carboxylic acid chloride was condensed with the magnesium ethoxy derivative of malonic ester to yield, after acid hydrolysis, 4-hydroxy-canthin-6-one (XV). This compound, with phosphorous oxychloride followed by heating in a sealed tube with potassium methyl mercaptide, gave the alkaloid XIV. If 4-hydroxycanthin-6-one is condensed with phosphorous oxychloride-phosphorous pentachloride, 4,5-dichlorocan-thin-6-one and 4-hydroxy-5-chlorocanthin-6-one are formed. 

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