TM 5-6630-215-12Figure 2-25.“L” Tube Assembly(e) Let react for 20 minutes. If the solution is cold, warmthe bottle in your hands.NOTEWhile the arsenic test is developing, performother tests.(f) Remove the test strip from the tube L and note the lengthof the yellow to brown stain.A stain 1/4 inch or more indicates apositive test; a stain less than 1/4 inch indicates a negative test.(2) Mustard Test (Including Nitrogen Mustards and Cyanogen Chlo-ride).(a) Rinse a test tube with the water specimen, and carefullyfill the tube about 1/2 inch deep with the specimen water.(b) Add 1 table from the blue capped vial D and agitate for3 minutes.Bring the solution to a boil with a match, lighter, orother source of heat.(The test carried out without the flame is lesssensitive but will detect amounts of nitrogen mustard.)Allow thesolution to stand for 5 minutes.During cold weather keep the tubewarm in hand or inside pocket for an additional 5 minutes.A yellowcolor in the solution is positive for cyanogen chloride.(c) Add 2 tablets from the red capped vial E to the test tube.Agitate the test tube gently, observing against a white background forany change of color in the sample (or in the curd) from white to redor blue.Any visible color change, even if it fades quickly indicatesa positive test for mustard or nitrogen mustards.A yellow colorindicates cyanogen chloride.A white color indicates a negativetest.2-92
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