By Clarence Karr (Eds.)
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Additional resources for Analytical Methods for Coal and Coal Products. Volume II
W i t h b o t h p r o c e d u r e s it h a s b e e n s h o w n t h a t i n the infrared spectra of the reaction products, the O H b a n d has b e e n a l m o s t c o m p l e t e l y e l i m i n a t e d a n d b a n d s to b e e x p e c t e d f r o m t h e g r o u p s i n t r o d u c e d d o i n d e e d a p p e a r . T h e r e is t h u s o b j e c t i v e e v i d e n c e t h a t t h e t w o a s s u m p t i o n s n o t e d p r e v i o u s l y are v a l i d i n t h i s c a s e ( B r o w n a n d W y s s , 1 9 5 5 ; F r i e d m a n et al, 1 9 6 1 ; Duffy, 1 9 6 7 ) .
I n s o m e cases, direct oxygen determined b y a modification of the Unterzaucher procedure was used, without correction. Exactly what workers in other European laboratories did cannot n o w b e determined, but they probab l y d i d m u c h t h e s a m e . W o r k e r s i n the U . S . B u r e a u o f M i n e s l a b o r a t o r i e s i n P i t t s b u r g h i n t h e i r classic s t u d i e s o f the o r g a n i c c h e m i s t r y o f coals u s e d d a f a n a l y s e s , i n c l u d i n g total sulfur, b u t t h e y d i d n o t u s e d i r e c t o x y g e n d e t e r m i n a t i o n s .
T h e i m p o r t a n c e o f t h e s t u d y , h o w e v e r , is n o t t h i s c o n c l u s i o n , b u t t h a t for t h e first t i m e i n the h i s t o r y o f coal c h e m i s t r y s u c h questions had even been asked. T h e O H g r o u p s i n s i l i c a t e s c a n f o r m t r i m e t h y l s i l y l e t h e r s as w e l l as a c e t a t e s , b u t t h i s effect also is p r e s u m a b l y n e g l i g i b l e . I n d e e d , t h e r e is n o particular reason to s u p p o s e that mineral matter interferes w i t h this d e t e r m i n a t i o n , o t h e r t h a n b y f o r c i n g a d e t e r m i n a t i o n b y difference.