comparison btw floating ice and ice in refrigerator?

If you mean ice floating in the ocean, this is frozen sea water, which because of the dissolved ion content freezes at around -1.8°C, rather than 0°C for pure water.

Ice in a refrigerator is frozen water (either water you have placed in it, which, if you have used tap water is approximately pure water - there will be small amounts of dissolved ions, but its a minor content, or water that has condensed from the air on the inside of your freezer compartment. Again, this will be pure water).