An example of a modern totally chlorine-free ( TCF ) sequence is "'OZEPY "'where the pulp would be treated with oxygen, then ozone, washed with sodium hydroxide then treated in sequence with alkaline peroxide and sodium dithionite.
32.
Bleaching mechanical pulp is not a major cause for environmental concern since most of the organic material is retained in the pulp, and the chemicals used ( hydrogen peroxide and sodium dithionite ) produce benign byproducts ( water and, eventually, sodium sulfate, respectively ).
33.
Sodium dithionite ( ), contains the more highly reducing dithionite anion ( ) . 2 S 2 O 6 ) contains the dithionate anion ( S 2 O 6 2 " ) and is the first member of the polythionic acids ( H 2 S " n"
34.
Sodium dithionite ( ), contains the more highly reducing dithionite anion ( ) . 2 S 2 O 6 ) contains the dithionate anion ( S 2 O 6 2 " ) and is the first member of the polythionic acids ( H 2 S " n"
35.
Dithionite is often used in conjunction with complexing agent ( " e . g . ", citric acid ) to reduce iron ( III ) oxy-hydroxide into soluble iron ( II ) compounds and to remove amorphous iron ( III )-bearing mineral phases in soil analyses ( selective extraction ).
36.
A simplified three-step process for artificial divicine synthesis : ( 1 ) The benzyl group of 2-amino-5-benzyloxy-4-hydroxypyrimidine is removed by acid hydrolysis, yielding 2-amino-4, 5-dihydroxypyrimidine . ( 2 ) This intermediate is then treated with nitrous acid to yield the slightly soluble orange product, 2-amino-6-nitrosopyrimidine-4, 5-diol ( 3 ) which is then reduced with sodium dithionite to yield divicine.
