Titanium dioxide and zinc oxide are commonly viewed as safe. particularly in sunscreens and similar topical items. These physical sunscreens deflect UV rays and are gentler on the skin. without being absorbed into it or causing systemic exposure. Yet. it's important to be cautious when using products like spray sunscreens that contain these minerals. as inhaling them could potentially lead to lung inflammation and damage. As a result. the FDA is continuously researching these ingredients to guarantee their safety.

Polypropylene is a type of plastic known for its hydrophobic nature, meaning it does not absorb water. However, this characteristic also makes it an effective material for oil absorption. Unlike water, oil has non-polar molecules, similar to the molecular structure of polypropylene, which allows polypropylene fibers to attract and hold oil particles. This property is particularly useful in environmental cleanup operations, such as oil spill remediation. Polypropylene can be manufactured into various forms, such as mats, rolls, and booms, tailored for collecting oil from water. Its lightweight and high oil affinity make it a preferred choice for oil spill response teams. Despite its effectiveness in oil absorption, considerations regarding its disposal and environmental impact post-use are important, as polypropylene is not biodegradable.

Titanium cations are titanium atoms whose electrons have been lost to gain a positive charge. Various titanium cations can be formed depending on the number of electrons lost. For example. Ti4 describes a titanium cation that has lost four electrons. It is common for titanium cations to form in titanium reactions. such as industrial processes or biological systems. They are frequently used in materials science. chemistry and environmental science.