impurity

A Forest Service report said it could not rule out potential heavy metal impurities in retardant, which was hosed down from firefighting planes.

The drug, which fights cravings, was available a few years ago on the NHS under the brand name Champix but was withdrawn due to some impurities.

It followed concerns in several countries that the products may contain the impurity.

Some of these rivets have been tested to see if they contain any impurities.

A key achievement of Jiao's system is not only enhanced production capability, but also the system's resilience against industrial impurities, a critical factor in real-world applications.