L Tube Assembly
(e) Let react for 20 minutes. If the solution is cold, warm
the bottle in your hands.
While the arsenic test is developing, perform
(f) Remove the test strip from the tube L and note the length
of the yellow to brown stain.
A stain 1/4 inch or more indicates a
positive test; a stain less than 1/4 inch indicates a negative test.
(2) Mustard Test (Including Nitrogen Mustards and Cyanogen Chlo-
(a) Rinse a test tube with the water specimen, and carefully
fill the tube about 1/2 inch deep with the specimen water.
(b) Add 1 table from the blue capped vial D and agitate for
Bring the solution to a boil with a match, lighter, or
other source of heat.
(The test carried out without the flame is less
sensitive but will detect amounts of nitrogen mustard.)
solution to stand for 5 minutes.
During cold weather keep the tube
warm in hand or inside pocket for an additional 5 minutes.
color 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 for
any change of color in the sample (or in the curd) from white to red
Any visible color change, even if it fades quickly indicates
a positive test for mustard or nitrogen mustards.
A yellow color
indicates cyanogen chloride.
A white color indicates a negative