Final answer:
The maximum residual ETO level in a 100 gram tissue must not exceed 50ppm (parts per million). PPM is a unit used to express the concentration of a solute in a solution. Option d.
Step-by-step explanation:
The maximum residual ETO level in a 100 gram tissue must not exceed 50ppm (parts per million). This means that for every million parts of the tissue, there should be no more than 50 parts of ETO.
PPM is a unit used to express the concentration of a solute in a solution. It is commonly used in chemistry and the health sciences to describe the concentration of trace elements, poisons, contaminants, and pollutants.
For example, if a 100 gram tissue contains 50ppm of ETO, it means that there are 50 parts of ETO for every million parts of the tissue.
The question refers to the maximum allowable residual level of Ethylene Oxide (ETO) in a tissue sample, where ETO is commonly used for sterilization purposes. In the context of health sciences and safety regulations, concentrations of such chemical substances are typically expressed in parts per million (ppm) or parts per billion (ppb). These are units that describe the ratio of the mass of the solute (in this case, ETO) to the mass of the solution (the tissue), with ppm being the number of parts of the solute per million parts of the solution.