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.
Very few people realise that cooked rice can be responsible for their foodborne illness. Rice forms the basis of many ethnic foods and foods containing rice are frequently implicated in food poisoning episodes.It is common for food producers to prepare large quantities of rice a day ahead of use and leave it to cool slowly at room temperature, before heating and serving the next day.ice forms the basis of many ethnic foods and foods containing rice are frequently implicated in food poisoning episodes. It is common for food producers to prepare large quantities of rice a day ahead of use and leave it to cool slowly at room temperature, before heating and serving the next day.