DHA may be prepared, along with glyceraldehyde, by the mild oxidation of glycerol, for example with hydrogen peroxide and a ferrous salt as catalyst.
2.
The presence of reddish or orange mottles indicates localised re-oxidation of ferrous salts in the soil matrix, and is often associated with root channels, animal burrows or cracking of the soil material during dry spells.
3.
As the carbon dioxide escaped, the ferrous salt absorbed oxygen from the air and the hydrated ferric oxide separated as a " yellowish red turbidity, " which settled after a short period, leaving behind a clear brine.
4.
Other treatment measures included removing insoluble salts using a 2 % solution of sodiumhexa meta phosphate, ferrous salts with a 2 % solution of EDTA and removing bat excreta with a 5 % solution of liquid ammonia and non-ionic detergent followed by a second stage of treatment by applying a mixture of ammonium carbonate and ammonium bicarbonate, with EDTA as an additive.
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