1 In general, the total dissolved solids concentration is the sum of the cations (positively charged) and anions (negatively charged) ions in the water.  Parts per Million (ppm) is the weight-to-weight ratio of any ion to water.
If you refrigerate the rice, and you want to eat it cold, its perfectly fine. People eat cold rice salads all the time. Cold rice pudding is fine. Its just sitting around at room temperature that is the problem.
Tinkjon Thu 15-May-08 10:37:43. I cooled the rice quickly and it's been in the fridge ever since - can I keep it for 48 hours or should I use it earlier? I usually keep cooked foods for that long but I know rice can be dodgy.