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muffle furnace are una vailable). 6. 1.5 % parlodion solution. (Dissolve 1.5 g of parlodion* in isopentyl acetate* and dilute to 100 mL with isopentyl acetate.) 7. Optional (if calcite present): 25% v/v concentrated hydrochloric acid* (ACS reagent grade) in distilled water and 25-mm filters of PVC or ce llulose ester with pore size of 1 :m or less.

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SILICA, CRYSTALLINE, by XRD: METHOD 7500, Issue 4, dated 1 5 March 2003 - Page 3 of 9 NIOSH Manual of Analytical Methods (NMAM), Fourth Edition SPECIAL PRECAUTIONS: Avoi d inha li ng silic a d us t [3] . T HF is extr emely f lamm able a nd shoul d be used in a fum e ho od. 2 -Pro pan ol, parlo dion and isope ntyl ace tate are flamm able.

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