Document 2qk1Yq47O7E57zkY6k9d4q6jN

The determination of soluble lead in insulating wool by the British Solubility Test. Preparation of Semple Duplicate 1 gram samples were shaken for 1 hour in 1000 grams of 0.25$ (by weight) hydrochloric Acid. After permitting to settle for an additional hour* the mixtures were filtered and the filtrates analyzed for lead by the speotrographic method* ( The mixtures gave off a definite odor of hydrogen sulfide) Sample Grams used Mgs Pb found - 1 gms. I4..0 Sample #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