Discussion
Name the fixative available in water soluble fixed type of preservative to fix the toxic ions in the wood.
Answer: C
The fixative is chromium.
In water-soluble 'fixed' preservatives such as copper-chrome-arsenic (CCA) and acid copper chromate, the chromium compound reacts with the wood after treatment and fixes the toxic copper and arsenic in insoluble forms, so they are not washed out by rain or soil water.
Chlorides, fluorides and sulphides do not act as fixatives; fluoride salts are themselves leachable preservatives.
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