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.
The grains of uncooked rice tend to have bacteria which can cause food poisoning. Once the rice is cooked and is not going to be eaten on the same day, it is best to refrigerate the cooked rice, as soon as possible.he way to prevent any form of food poisoning is to avoid keeping cooked rice at room temperature for too long. Preparations with rice like rice salads and other dishes should also be refrigerated once prepared, till it is serving time. Avoid reheating the rice more than once or eating rice that is really old.