My sample's dissolved oxygen is decreasing dramatically.What can I do to keep it stable or increase it again?
you can't ignore Henry's law. As long as the sample is open, the concentration of oxygen is proportional to the partial pressure of oxygen in the air.
Why do you want to keep the oxygen in the solution?
Dissolved Oxygen (DO) of water decreases dramatically with the increases of turbidity of the water sample. Hence to increase the dissolved oxygen of the water sample need to clarification using coagulants and coagulant aids chemicals to form flocculation. The chemicals may be poly aluminum chloride (PAC)and poly acryl amide (PAM) with caustic soda (NaOH or KOH) to maintain the optimum pH value. For laboratory purpose, aeration or microbial agent (Bio-granule) or CaCO3 or MgCO3 can be used to increase the dissolved oxygen of water.
Would cooling the liquid (aqueous solution) help increase the dissolved oxygen content?
If the water contains salts (e.g. sodium chloride) , then the freezing point of this aqueous solution will decrease if I am not mistaken.
From what I know exposed solution contain more gases when cool than warm.
As per previous answers, if you can sparge, then sparging with pure O2 will increase the level of DO, as well as increasing the concentration of O2 above the liquid.
If the cloudiness is bacterial growth, then this actual growth may be the cause of the DO drop - due to microbial consumption. DO levels in pure water are typically pretty low to start with (tens of ppm if memory serves) so it is very easy to lose some or all of this.
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