Sentence examples for and difficult to remove from inspiring English sources

Often, soils that have been contaminated for a long time sequester contaminants deep within aggregates where they are difficult to measure and difficult to remove.

Polycyclic aromatic hydrocarbons (PAHs), especially those having four or more rings, are abundant and toxic environmental contaminants that are highly persistent and difficult to remove from contaminated ecosystems.

Temperature-programmed oxidation (TPO) studies indicate that the carbon formed in the conduction layer of an anode-supported cell is much more stable and difficult to remove than carbon formed on the functional layer.

However, it also raises the risk of creating errors in the genetic code that would be inherited and difficult to remove, or creating enhancements to subgroups within the population that would exacerbate social inequalities, the statements says.

TPO of the spent catalysts showed greatest carbon deposition for the dry-reforming, a significant portion of which was graphitic and difficult to remove.

Mature specimens are fragile, and difficult to remove from the ground without breaking.

However, the metallic particle impurities usually contaminate the CNTs, and are difficult to remove without introducing defects and contaminations.

This can leave a fine, powdery residue on the woodwork and strings which hardens with time and becomes difficult to remove.

These surfactants remain at the particle surface and are difficult to remove which affect the biodegradability and drug release profile of the drug-loaded particles.

Various adsorbents have been applied for the removal of selenium from water but performed poorly in Se (VI) removal, which is more bioavailable and more difficult to remove.

Scale deposition on pipe walls is prevalent in water distribution systems and is difficult to remove.