Don't think it has one. I think the scientific word for pure IS pure. It depends on context; however, if you are referring to chemicals, the term is NEAT. If you add a pure, un-mixed chemical, it is referred to as neat.
A scientist would use a spreadsheet to mark down dangerous chemicals. They would also possibly use them to list the chemicals as well. Scientists use spreadsheets to track scientific progress in chemicals and to track the amount of chemicals e.g. in scientific calculations or in experiments.
A loan word is a word from a foreign language that does not have a direct translation in the native language. Consequently, when the native language wishes to express the idea conveyed by the foreign word, they simply use the foreign word directly.