Sulfur in Gear Oils

In this method  the sample is vaporized  and  burned in a  stream of air, and  the  oxidation completed  by passing  over  quartz particles  maintained  at a temperature  of 950 to 1000 degree C. The combustion  products are then  passed  through hydrogen  peroxide  which  absorbs  the  sulfur  as sulfuric  acid  and  the  chlorine  as hydrochloric  acid. The  absorbent  is then  analyzed  for total  acidity  and  for chloride ion. The  procedure for  the  determination  of  chlorine  is  included  only  for  correcting   the  sulfur  content  and  the  method is not  recommended  for the  determination  of chlorine  alone.