Document qdNmJeJJZG7JRMka8qZXB4jZG

The determination of soluble lead in insulating wool b y the British Solubility Test. Preparation of Semple Duplicate 1 gram samples were shaken for 1 hour in 1000 grams of 0 .2 5 $ (by weight) hydrochloric Acid. After permitting to settle for an additional hour* the mixtures were filtered and the filtrates analyzed for lead b y the speotrographic method ( The mixtures gave off a definite odor of hydrogen sulfide) Sa m p l e El Grams used - 1 gms. Mgs Pb found - I4..0 Sam p l e # 2 Grams used Mgs Pb found - 1 gns* 3*9 On the basis of 1% lead in the original wool* these figures indicate that I4.O/& of the lead is soluble in the 0.25/S acid. Reported: 6-3-1938