FED-STD-228A
3.2 The reagents shall be as follows:
3.2.1 Ammonium alum. solution. The solution shall be prepared by dissolving 3.5 grams of ammonium
alum (AINH4(SO4)212H2O) in 100 ml. of distilled water. (One ml. of the solution contains approximately 2
mg. of Al.)
3.2.2 Ammonium chloride, 1 percent solution.
3.2.3 Ammonium persulfate, 10 percent solution, prepared fresh as required.
3.2.4 Ammonium sulfate, 35 percent solution. The solution should contain less than 0.0005 percent
arsenic.
3.2.5 Ammonium thiocyanate, 20 percent solution.
3.2.6 Antimony chloride solution. The solution shall be prepared by dissolving 2 grams of antimony
chloride (SbCl3) in 200 ml. of hydrochloric acid, specific gravity 1.19, and diluting to 1 liter with distilled
water.
THERMOMETER
GLASS CAPILLARY
10
JOINT
PRESSURE
S 30
REGULATOR
MM. IN INSIDE
DIAMETER
.2500" GLASS
DISTILLATION
29
JOINT
TUBE
42
500 MM
FLASK
.1250 TO .2500"
FIGURE 7231C. Apparatus for distillation of arsenic.
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