CO2 and aerosols to blame for temperature differences? Part 1

An experiment I did today at AM 8.40. I used 0.15 litre of liquid in each of three cups, put an ice cube of same size in each and closed all cups with a lid (taped them all). The liquid in the first cup was plain tap water (labelled WATER), the liquid in the second was bottled water with CO2 (labelled FARRIS), and the liquid in the third was bottled water with CO2 and  a small amount of lemon juice (labelled FARRIS+). All liquids had beeen for three days in the same room where this experiment took place. The temperature in the room at the start and end of experiment was 15 degrees Celsius.

After 12 minutes I opened the cups and saw there was just a small, but still a four squared ice chip left in the cup labelled WATER. In the cup labelled FARRIS there was a more ablong chip of ice left - probably more voluminous than the ice chip in the cup labelled WATER. In the cup labelled FARRIS+ there was also a more ablong chip of ice left, but difficult to see if this one was bigger than the ice chip in the cup labelled FARRIS.

After about 4 minutes later the ice chip in the cup labelled WATER was all melted, but there was clearly still an ice chip left in the two other cups. After about 5 minutes more the ice chip in the cup labelled FARRIS was melted, but the ice chip in the cup labelled FARRIS+ was still hanging on. After still more 3 minutes this last chip of ice was all gone.

This experiment confirm a similar experiment made by a TV crew at NRK a few years ago. The experts then thought the CO2 bubbles isolated against heat reaching the ice cubes, but with my cup filled with water and CO2 plus traces of lemon juice showing a still longer time for the ice cube to melt completely, I don't think that hypothesis is correct. In the next part I will present my own ideas about this.